Preserving our genetic heritage

The above portrait is of my great uncle Leonard Smith, with my grandmother, Doris Smith of Norwich.  Taken circa 1904.

Preserving our genetic heritage

I've ordered a genetic profiling kit to test my mother.  I want the results 1) for phasing with my own results, in order to better understand where different segments on my chromosomes originate from - from which parent.  2) because I feel that my mother has a particularly rich, documented, and very localised Norfolk ancestry.  Finally 3) because I feel almost duty bound to do so, while I can.  I've lost my father.  My mother will not always be here, as neither will I.  I wont always have the chance to do this.  By examining Mum's SNPs, I'll be able to find out exactly what SNPs my late father gave me.  I think that I've seen programs that try to rebuild the DNA of a missing parent, by combining the results of their children or / and other relatives.

This has lead me to ponder over the future.  Will we want to preserve the genetic scans of our parents and grandparents?  Will the desire to capture photographic images of our elders, then to preserve them long after they've gone, transform itself into a desire to preserve genetic profiles?  Will we value the raw data of their SNPs?  Will great granny's genome be handed down in the form of binary data from chip to chip?  Will families pride themselves on the ownership of a SNP scan data from a great great grandparent?

The Iberian Connection

The above photo at A Capela dos Ossos (the bone chapel) in Évora, Portugal. The entire chapel is covered with human bones.  Every wall and pillar is decorated with skulls and bones.  On another wall hangs the mummified remains of a man and child, said to have been cursed. There is a sign at the entrance of the chapel which states "Nós ossos que aqui estamos, pelos vossos esperamos" (Our bones here, await yours).

Genetic Genealogy

I was a sceptic of genetic genealogy, I'll admit it.  Now I'm hooked.  Not because I feel that it has been a way of hooking up with distant cousins, that can help me extend my family tree.  That's not the way that I've used it so far.  Instead, it has provided very different kind of information, that helps me understand who I am, and how I can link my ancestry to known heritage.

I might not have been so hooked, but I've had so many surprises with my 23andMe results.  If my results had been perhaps, dire and boring, then maybe I would have retreated to traditional genealogy and regarded the technique as predictable and uninteresting.  However, what ancestry related surprises did I have?

  • I have a very rare Y haplogroup for NW Europe.  So far predicted to L1b M317.  It will be shared by my brother, my son, one cousin (and his son, and grandson).  Today I sent away a further FTDNA Y111 swab test.  The L haplogroup is mainly concentrated in Southern and Western Asia, from Afghanistan down to Southern India.  My L1b M317 sub clade is concentrated in Western Asia, including Eastern Turkey, Armenia, Georgia, Azerbaijan, the South Caucasus, and Western Iran. A faint trace of it along the length of the Med in Southern Europe, and across Italy, and a slight cluster in central Europe - which apparently, I don't belong to.
  • Autosome Ancestry composition by 23andMe, gave me a very low percentage of "British & Irish", and high percentages of "French & German" and "Scandinavian".  I've explored the possibility that this could reflect early medieval admixture from across the North Sea.  I've looked at the typical Ancestry Compositions of people with a strong recorded English ancestry, and compared them to the results from people with strong Irish ancestry.  That SE English people typically sit somewhere between the Irish, and typical Dutch in Ancestry Composition reinforces my view that this is the case.
  • My mtDNA was H6a1.  Not the most exciting haplogroup, but not the most boring neither.  It allows me to relate to the latest evidences for Eurasian Steppe admixture into Western Europe during the Early Bronze Age.

A Southern European Enigma

I captured the above photo at Cabo Espichel, Portugal.

There was a fourth, further surprise in my 23andme results.  It lay in the autosome.  23andMe AC (Ancestry Composition) on speculative mode, suggested 2.4% Southern Europe, including a prediction of 0.5% Iberian ancestry.  On speculative mode again, it falls on five pairs of chromosomes - but never on both sides.  On standard mode, 0.1% remains, just on one side of pair 21.  This suggests that all of it comes from just one of my parents.

I might think that this was just "background noise", an error in AC.  However, it keeps popping up.  Indeed when I upload my raw data to the program at DNA.land, they predict only 80% North/Central European, and a whopping 15% South European.  It doesn't stop there.  On GEDMATCH, the Eurogene calculators keep suggesting Iberian or South European admixture on their mixed population oracles.  Eurogenes K9 for example, gives me 61% North European, 29% Mediterranean, and 6% Caucasus.

Let's just refer back to my recorded paper ancestry.  I have 190 recorded ancestors, all in England, with English surnames.  No sign of any Roman Catholicism.  I have all sixteen of Generation 6 (G.G grandparents) named.  All born and named English.  No sign of any South European even in the 1,490 people on the entire family tree for my kids.

However, I think that all of the autosome ancestry calculators could be telling me a truth, that I can't see in my known family tree.  If I have a South European ancestor somewhere, whether Iberian or not, then either a) I have not yet found them, or b) they were the biological ancestor of a NPE (non-parental event), a cuckoo.  I have 3 out of my 32 Generation 7 ancestors unnamed - all absent fathers.  I have 15 missing ancestors in Generation 8.  Above that, the representation really starts to decline, although I have some ancestors named up to Generation 11.  Could a South European be in there?  23andMe in speculative mode suggested 2.4%.  That would seem "average" for an ancestor in Generations 7 or 8 (3 to 4 x G grandparent level)  Of course from around that point, "averages" become pointless, and subject to a randomness that can delete entire lineages further up from any surviving DNA.  None-the-less, I could have a South European from around that period - either one of the 18 "missing" ancestors, or a NPE cuckoo.

I'm commissioning a 23andme test for my mother.  Three reasons.  1) she wont be here for ever.  Recording her genome feels valuable and worthy.  2) I want to see how her very dense 100% recorded Norfolk ancestry projects on Ancestry Composition and on GEDMATCH.  3) I want to phase her results against mine.  It will tell me for example, where my "South European" DNA came from - which parent.  It will help me further understand my own genetic ancestry.

Our exotic Y Haplogroup L1b

A Y haplogroup is a genetic marker that is passed down on a paternal line.  From great grandfather, to grandfather, to father, to son, and so on it goes.  The mt-DNA haplogroup on the other hand, is a genetic marker on the maternal line.  Together, they represent only two lines of descent.  The below illustration demonstrates these two markers on our own family pedigree fan chart over recent generations:


What is exciting about these two human haplogroups, is that by recording their mutations, and plotting them both against both the geographical distributions of present-day populations, and of archaeological human remains, we can start to paint a picture of past movements and origins in population genetics across thousands of years.  We can start to see how some of our ancestors moved across the World during prehistory.  Haplogroups offer a personal touch.

My recent 23andme test reported that I have inherited an mt-DNA haplogroup H6a1 from my mother, and a Y haplogroup L2* from my father.  

My brother, sisters, and my sister's children should also share the mt-DNA haplogroup H6a1.  This mt-DNA haplogroup has recently been recognised as originating in Eurasia.  It mutated from earlier haplogroups from Central Asia.  Current thought based on recent evidence (2015) suggests that it was carried into Western Europe during the early Bronze Age, circa 5,000 to 3,500 years ago, by pastoralists that spread out of the Eurasian Steppes north of the Black Sea in the Ukraine and South Russia area.  These Steppe pastoralists have been associated with an archaeological culture known as Yamnaya, and H6a1 has been detected in female human remains there.  Archaeologists suggest that their success was in domesticating strains of horses, that they could ride, in order to manage larger herds and flocks of grazing livestock.  Another success may have been their development of wheeled carts, that could be horse drawn.  Whatever the factors were, they appear to have been so successful, that their descendants spilled out from the Steppes, dominating Bronze Age Europe.  Therefore based on current evidence and thought, it might seem fair to imagine that we have direct maternal ancestors that 5,500 years ago were women in this Eurasian Steppe Culture.  That is the personal touch of the haplogroup.

But what about the Y haplogroup L2* that we inherited from our father, and our paternal line?  My brother and my son should share this Y haplogroup.  I'm making this post to better understand this heritage.

Y Haplogroup L


Distribution Haplogroup L Y-DNA

Distribution of Y haplogroup L today.  Above image by Crates (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 4.0-3.0-2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/4.0-3.0-2.5-2.0-1.0)], via Wikimedia Commons.

There were a number of surprises from my personal 23andMe DNA test results.  However, that my Y haplogroup is L2* was perhaps the biggest shock.  I take back all reservations that I had about DNA testing for ancestral purposes.

The 23andMe introduction that accompanied my reported Y haplogroup suggested "Haplogroup L is found primarily in India, Pakistan and the Middle East. The L1 branch is especially common in India, while L2 and L3 are more common further north.".  This is not an English haplogroup.  It is not even a European haplogroup.  It is regarded here as South Asian, spreading down from Afghanistan to Sri Lanka, and across from Iran and into Eastern Turkey.  The above map illustrates the distribution of the Y Haplogroup L as we presently know it.  However, the Y haplogroup L has sub groups, that until recently were designated as L1, L2, and L3.  These subgroups were not distributed equally across the above geographic distribution.

"M76 (current L1a1, former L1) is the most common subgroup in India, while M76 and M357 (current L1a2, former L3) have approximately equal weight in Pakistan. M317 (current L1b, former L2) is rare in the Indian subcontinent. Iran seems to have all three major subgroups, while Turkey appears primarily M357. Other papers have found additional markers. For instance, L1b can be divided into two subgroups, M247 and M349. The people who do not belong to L1 have not been studied in academic papers, but only in personal genetic tests. Their ancestry is European, but it is possible that this group is present in the Middle East or Caucasus, where few people have tested". (Marco Cagetti).

My actual 23andme (ISOGG 2009) assigned L2* mutation should, using the latest designations, be referred to as L1b or, L-M317. I am seeing suggestions that L-M317 may have originated as recently as 10,000 years ago, between Levant and the Iranian plain. My haplogroup L-M317 appears to be strongest in clusters across Western Asia, between Iran and Turkey, with reports in Iraq, Armenia, Georgia, Anatolia, the Chechen Republic, and the Russian Federation.  It is not South Asian.  Marco Cagetti suggests that it is at very low frequency in Southern Europe, less than 1%.  However, this table might suggest that there are stronger pockets of Y Haplogroup L in pockets across Italy.  It has been observed in Portugal, Spain, Italy, and along the Mediterranean.  A sub-clade, L-M317 M349, is found in the Levant, but also clusters in in Central Europe including Germany, Austria, the Czech Republic, and Switzerland.  M349 is subsequently believed to have originated in the Levant.

What about in England?  L1b doesn't appear to have been well documented or researched here.  The FTDNA Y Haplogroup L Project has mapped only three L submissions in the UK - including one undisclosed, one M349, and a single L-M317 - this one in the Basingstoke area, not a hundred miles from my surname carriers in South Oxfordshire.

The chances are, that my L1b will pan out to belong to the L1b1a M349 sub-clade.  It could relate the Rhine-Danube cluster recorded in Central Europe at the FTDNA Y Haplogroup L project.

So how did it get here?  Where do the European L1b's come from?   Some researchers suggest that it could actually be in quite old in Europe.  It could have spread westwards out of the Levant with the Neolithic Revolution, carried by the first farmers.  If this is the case, then it may have been severely displaced by the arrival of new waves of haplogroups that arrived in Europe later, during the Early Bronze Age, leaving just a few clusters to survive.  My Y could be a remnant of earlier European farmers, that were largely displaced by the same wave of haplogroups from the Steppes that carried my mt-DNA into Europe.

Alternatively, it may have arrived here any time later - during the Later Neolithic, or as is a popular theory, it could have been spread into Europe from the Pontic Greek clusters around the Black Sea, or from elsewhere, via the Roman Empire.  It may have even spread into Europe during the medieval.  Some people suggest Byzantine movements in Southern Europe as one possible source.  Others claim links between their L1b and Ashkenazi Jews in their ancestry - either known, or suggested by autosome ancestry composition testing.

It has been suggested that I commission a BIG Y test, but I cannot justify that cost. I think that it is worthwhile commissioning a Y STR test, in order to examine and provenance it. Then should future research bring up any new understanding, I'll be able to best place our lineage within it.  I've ordered the FTDNA Y111 test next.

The 23andMe DNA results are in!

The results were uploaded to my 23andMe profile today.  I posted/registered the sample from the UK, nine weeks ago.  The sample traveled to the USA lab via a NL holding depot.  It took six weeks to process the sample and results, from the time of being marked as arriving at the USA lab.  I feel very fortunate, as many 23andMe customers are reporting a seasonal log-jam that is delaying the process.  My results though were comfortably within the proposed time frame.

There were a number of pleasant surprises.  The results were far from boring.  

Genetic Risk Factors

On the health side that we UK customers can presently still enjoy - there was only good news.  Although I have a family history of Alzheimer's that is strong on my father's side, there was no identification of any genes in my DNA, that have so far been associated with increased risk of the illness.  If my father did have these genes, I didn't receive them.  It does not mean that I will never be at risk to the illness, but it gives me some comfort.  Indeed, all of my 23andMe genetic risk factors were good.  There was no bad news.

Traits

An amusing little trait, that IS identified by the DNA analysis, is on Asparagus Metabolite Detection.  When I eat asparagus, my urine smells strongly.  It confirms for me - that the system works!  It also correctly identifies that I have a sweet tooth, that I have blue eyes, etc.

Now to the genetic genealogy goodies.

Ancestry

Y-DNA

The genetic marker that I inherit from my strictly paternal lineage - father's father, father, and so on, going back.  On paper, I've traced this back to a John Brooker, that lived in Oxfordshire, but was born outside of that county, perhaps in nearby Berkshire, circa 1785.  Of course, that is if no-one ever lied in forms over who the father was.

This one was a shocker.  A little background first.  Although my paper ancestry over the past 350 years is overwhelmingly localised in parts of the county of Norfolk, in East Anglia, my paternal-line surname carrier, that should be the donor of my Y chromosome marker, or Y-DNA, can be traced to Oxfordshire, in Wessex.  Out of my eight paper great grandparents, seven were Norfolk born and bred.  However, the exception was my paternal great grandfather.  Therefore I would not expect my Y-DNA to belong to any local Norfolk gene-pool.  It is the least representative lineage for my heritage.  This is why I feel that people can sometimes place too much value on their haplogroups.  I did however, expect it to belong to a common English or British haplogroup such as the Y-DNA R1b group.

I was in for a surprise.  It is exotic L2*.

From initial research including an Internet search, this haplogroup forms only a rare back scatter across Europe.  It appears more commonly across Western Asia and the Sub-Continent, from Turkey to Southern India.  It is most common in Pakistan, where it may originate, circa 30,000 years ago.  It is not a common European Y-DNA haplogroup.  I need to more carefully research this in the near future, but I'm in awe to find that I have an exotic Y-DNA.  It does conjure up images of one of my paternal ancestors being a Syrian archer, or Persian mercenary in the Roman Army, fathering a child, while stationed in Britannia, or perhaps elsewhere in Roman Europe.  But that might be too fanciful.  Anyway, I'm having pheasant curry for dinner tonight.

This genetic marker should be shared with my son, and my brother.  A few of my first cousins will also have it.

mt-DNA

The genetic marker that I inherit from my strictly maternal lineage - mother's mother, mother and so on back.  On paper, I've traced it back to a Mary Page, who was born in 1802, in Norfolk.  I like the maternal line, as it is actually the most biologically secure.  Few forms lie about who the mother is.  I'd expect my mt-DNA to be a haplogroup firmly established in East Anglia.

A nice one to have.  It is H6a1.

This haplogroup belongs to the Helena group.  However, it is not ancient European.  H6 is believed to have mutated from H around 30,000 years ago in Central Asia.

H6a1 has recently been associated with the Yamnaya migration into Western Europe, from the Eurasian Steppes to the north of the Black Sea, some 4,000 to 5,500 years ago.  In Europe itself, it could be associated with a number of Early Bronze Age cultures, the Corded Ware culture.  It has been linked with the R1b Y haplogroup, that dominates Western European countries such as Ireland, France, and the British Isles.  Recent studies have indeed suggested a significant displacement of people in Western Europe, that occurred in late prehistory, with the arrival of pastoralists from Eurasia.  This migration is also associated with the rise of the dominant Indo-European linguistic group of Europe.  If H6a1 does indeed prove to be linked to the Indo-European explosion of the early Bronze Age, I'd be very happy.  I like to imagine one of my maternal ancestors 5,500 years ago, accompanying a band of prehistoric pastoralists, that are heading westwards into Europe with their horses.

This genetic marker will be shared with my mother, my brother, my sisters, and their children.  A few cousins will also share it.

Ancestral Composition

This is an area that I've been trying to understand recently.  It uses computer analysis, to compare my autosome DNA to a number of others in reference populations from around the World, which then composes suggested ancestry in percentages.  This magic attempts to look not at a few genetic markers or haplogroups, but at all of the patterns in my autosomal DNA, to predict likely ancestry on any lineages that survive in my DNA.

Previous to receiving my results, I recently revised and bolstered up my paper genealogy based family tree,  I now have 172 direct ancestors listed, going back to Generation 14 during the 17th Century.  I noted that all, and everyone of my paper recorded ancestors were English.  All of them.  That includes all of my eight grandparents, all of my sixteen great great grandparents, and thirty of my thirty two great great great grandparents.  That is 100% English.

Now, I'm sure that you'd agree, I should be expecting my 23andMe ancestry composition to give 100% English, right? Well no.  They can't presently identify an ethnic group like the English.  Instead, I should expect my results to fall 100% into the British & Irish category.

100% British & Irish?  No, I'll give this one early.  it was 32% British & Irish on speculative mode.  More on this further down.

My paper research before I received my results also revealed just how concentrated, most of my ancestry has been over the past 350 years.  I compiled the below map of East Anglia.   The BLUE marking the places of ancestral events from my family tree on my father's side; and the RED marking the places of ancestral events on my mother's side.  The larger the marker, the more events recorded.

I also made a map based on East Norfolk during the 4th Century AD, before sea levels fell, and drainage changed the coastline.  I then marked out the area of my mother's ancestry on that.

 The point that I was trying to make was that I believe that my ancestry may have been more exposed to the North Sea Immigration waves of the 4th to 11th centuries AD.  More exposed than your average person of British & Irish heritage.  I also suggested that East Anglia, very much a part of the North Sea World, was particularly attractive to Early Medieval migrants from Frisia, Schleswig-Holsten / Angeln, North Saxony, and from Denmark.

On reviewing the 23andMe DNA Ancestry Composition of an admittedly small sample of other users with strong English heritage, I concluded that the average ethnic English person receives the results:

100% European

60% British & Irish

10% French & German

2% Scandinavian

25% unidentified broadly NW European

People of Irish heritage, or even Americans with either Irish or British ancestry, tend to score a higher percentage of British & Irish than do the present day ethnic English.  23andMe has a generous and growing reference population in it's British & Irish database.  However I hypothesised that 1) the 23andMe B&I reference is skewed to the Irish, and away from English.  It is also possible that it is distorted by a case of genetic drift by testing Americans of British origin.  2) that the British & Irish designation may actually be inadvertently looking at DNA that arrived in the British Isles largely previous to the early medieval North Sea migrations.  To the British and Irish genes that have been here since late prehistory.  On the other hand, the French & German, the Scandinavian, and perhaps some of the undesignated Broadly NW European percentages that are usually assigned to the ethnic English, may actually reflect early medieval migration from across the North Sea.  The computer analysis is simply unable to distinguish some of the DNA from that of present day French, Germans, or Scandinavians, because of ancient admixture.

I'm told that this would not be the case, that 23andMe ancestral composition could not detect such deep, ancient admixture.  However, what if I am correct about my own heritage - that I likely have enhanced levels of Anglo-Saxon and perhaps Norse heritage, because of the geographical location of so many of my ancestors?  Should I not expect even lower percentage of the 23andMe British & Irish category, and even higher percentages of other NW Europeans from across the North Sea?  So what was my 23andMe ancestry composition percentages (speculative mode)?

100% European.  Broken down into:

94% NW European.

3% South European.

I'll get to the South European later, but what about this North west European?  Let's break it down into 23andMe's sub categories:

32% British & Irish

27% French & German

7% Scandinavian

29% undistinguished broadly NW European

Oh my goodness.  It correctly fits my prediction.  I have more than double the average percentage of F&G and Scand for English people.  Despite having a paper researched genealogy that is 100% English, 23andMe's ancestry composition based on a generous reference sample size of 1251 sets, gives me 32% British & Irish.

So a predicted, but still incredibly exciting result.  I'm chuffed to bits.  It does in my eyes, blow 23andMe's British & Irish designation out of the water though.  Their reference samples do not appear to match the East English.  Instead, their software misreads some of the English DNA for French & German, or Scandinavian.  I'm suggesting that this is because of ancient admixture, during the 4th to 11th centuries AD, with North Sea immigration.  I invite others to knock my suggestion down.

One more surprise from my Ancestry Composition:  A South European 2.7%.  Broken down into 23andMe's sub categories:

0.5% Iberian

2.4% undistinguished broadly South European

This looks real.  It appears that I have a small percentage of South European heritage.  Most likely from Spain, Portugal, or Basque.  I probably have Iberian ancestry that I have not yet detected using paper genealogy.  Either that, or it's an anomaly, a incorrect interpretation.

Neanderthal Ancestry

Finally, how much Neanderthal DNA do I have?  How much of my DNA was shared by the archaic humans that lived across parts of Eurasia, between 350,000 to 30,000 years ago?  Evidence of early admixture events between Neanderthal and anatomically modern human populations?

An estimated 2.9%.

That's just slightly above the average of 2.7% for modern Europeans.  So I am not more Neanderthal than most others.  Sorry to disappoint.

All in all, very happy that I spent the money.

Progress in Genealogy

As I wait for my 23andMe genetic profiling results (on Step 4 - DNA extraction), I have been spending perhaps a little bit too much time, on the computer, with internet genealogical resources such as FamilySearch.com, and the Norfolk FHS resources, to build up my paper genealogical record.  I'm impressed by the modern online resources, although I'm aware that transcriptions are always prone to error. 

I've also been having a blast building up my family tree database using the free Open Source software Gramps 4.2.  I'm a big fan of Open Source, and this program runs great on both Windows 7 64 bit, and on my Linux netbook.  I can see where Gramps may not appeal to some novices.  It's more functional than pretty, with an abundance of tabs for sources, attributes, notes, etc.  It encourages me to record better quality genealogy, than I did twenty years ago with the mess of my notebooks and pieces of scrap paper.  It also imports and exports GEDCOM format files with ease.  Essential for safe back ups and for sharing.  I can also generate reports and charts such as the above ancestor fan chart.

I'm please with how the above chart for example, has developed over the past few weeks.  I still have plenty to research for free online, so it is far from completed.  Still, considering that it represents a total of seven generations, I think that it is impressively complete.  If the paper was true, then these name should represent where my autosomal DNA has come from over the past few hundred years.

Of course, paper genealogy is not always true.  1) mothers sometimes deceive about who the biological father is, or make a mistake, when filling out birth or baptism forms.  2) genealogists make mistakes.  These errors increase the further back the records.  English/Welsh censuses, give no detail before 1841, civil registration did not exist until 1837, and parish registers before 1812 are often rough notes scribbled down by the curate.  Therefore, go back much before 1790, it's easy to make too much of too little source.

Genealogy is a lot of work.  The general public frequently expect that they can simply print their ancestry off, with a click of a button, and perhaps a Paypal fee.  It doesn't work like that.  It involves years of research for most of us.  However - here is the crunch.  The research is the rewarding part of the journey.

So in this Binary Age, people instead opt for the instantaneous results of Genetic ancestral composition with a commercial DNA lab.  1) it is fast and easy.  2) it tells the truth.  It follows DNA and SNPs, not forms or lies.

How good is it really?

My Anglo-Saxon Mother (Moder)

This is a follow on from my last post, concerning the mapping of my paper ancestry over the past three centuries.  A noticeable cluster of ancestry (on my mother's side) appeared on the maps from three generations ago, in Broadland or East Norfolk, including the villages of Reedham, Limpenhoe, Cantley, Freethorpe, Stokesby, Beighton, Postwick, Hassingham, Buckenham St Nicholas, Halvergate, Tunstall, South Burlingham, Moulton, and Acle.

That this cluster is so firmly entrenched, suggests that I have had ancestry in that locality for a long time.  I have already postulated that this area would have acted as a prime settlement district for immigrants from between the fourth and eleventh centuries, from across the North Sea.  I thought that I would play on this idea a little more.

The map below shows East Norfolk as it would have appeared during the Fourth Century, with slightly higher sea levels than we enjoy today, and previous to any substantial engineered drainage:

The red dappling, outlines the main cluster of my mother's paper ancestry, that provenances there during the eighteenth and nineteenth centuries.  Such a strong cluster would suggest deep roots in that zone.

Very different to the present day Norfolk Broads and Coast.  Great Yarmouth and Breydon Water are replaced by a Great Estuary.  Reedham literally faced the North Sea at the head end of the estuary.  Indeed, 20th Century works in the parish church of Reedham, revealed hidden herringbone decorations made from Roman bricks.  it has been hypothesised, that these bricks may have come from a nearby Romano-British lighthouse.

Revisionist historians and archaeologists have for many years, argued that the Roman forts of the Saxon Shore, were in fact not defensive, defending the province from attack by marauding Anglo-Saxon pirates, but were instead used to control and tax North Sea trade with the province.  Some have even gone so far as to suggest that areas like this were already being culturally influenced by the North Sea Anglo-Saxon world.

The collapse of Roman administration, and the disintegration of much of Roman society, and the Roman way of life, made it easy for Continental adventurers to cross the North Sea from outside of the old Empire, and to settle in Eastern England.  Some of them may have been escaping exploitation from the elites that were gathering power in their homelands.  They knew how to live with a rural barter-economy, without the niceties that the Empire had offered the British.  A recent study of human remains in the Cambridge area, noted that within a very short time, even the local British were adapting the customs and artifacts of Anglo-Saxon culture.  Not only that, but those remains that were genetically profiled as of being of local British origin not only aped the new immigrants, but their burials were higher status and richer.  The poorer graves mainly profiled as newly arrived immigrants from the Low Countries or Denmark.  The researchers suggested that in the case of immigration (rather than invasion), this is what we should expect to see.  The immigrants had to settle for whatever they could get, which would often be poorer land.

I'm going to restate my view.  I support a number of recent genetic surveys, also backed up by many archaeologists, that the 5th Century AD Anglo-Saxon Invasion of Britain was exaggerated in it's ferocity by Gildas and Bede, rather like the Daily Mail exaggerates present day immigration and it's "damaging effect".  It was certainly a very major migration, but it appears to have left the lowland British genome with no more than 20% to 40% of it's DNA share.  It seems from recent genetic studies, that the present day ethnic English, inherit more DNA from prehistoric British populations, than they do from Continental Anglo-Saxons.  Not only that, but the immigrants seem to have married into British society, rather than slaughter it.  It was during the later Sixth Century, that emerging elites of the lowland British kingdoms started to claim ethnic identification, and descent from heroic Angles and Saxons.

In this post, I'm not going to particularly distinguish between the Anglo-Saxon settlement of the 5th/6th Century AD, from the hypothesised Danish settlement of the 9th/10th century.  Perhaps we should see them as waves of North Sea immigration, but perhaps not so entirely divorced from each other.  The earlier may have originated more from Frisia and Angeln, and the latter from a little bit further north in Denmark, but the cultures don't seem to have been that much different.  When I was a boy, travelling through the loam soils of Broadland to see my relatives in Cantley, I was always struck by the big Dutch barns on the landscape.  I was told that the Dutch had long had connections to the area.  Maybe my parents underestimated how far back these links across the North Sea went.

This 20% to 40% Anglo-Saxon DNA spreads across all of England.  Even the Welsh and Cornish have a percentage of it.  However, I was intrigued by a comment in Stephen Oppenheimer in his book Origins of the British 2007, when he did just remark that the highest marker was from an East Norfolk sample!

When I look at the above maps, and in relationship to Frisia, Saxony, Angeln, and Denmark, it appears to me that the Great Estuary must have seemed like a magnet to the boat loads of new settlers.  Rivers opening up from the North Sea, to rich arable soils and lowlands.  A recently closed shore fort - tax, customs, and immigration control free!  I can't help but imagine the first boats beaching or mooring at Reedham, Cantley, Halvergate (-gate, another Norse place-name) etc.

Not only that, but during the 6th and 7th centuries, the sea levels dropped.  Desperate settlers could easily create new land with simple drainage methods.  This appears to be particularly relevant to the East Norfolk district of Flegg.  An island surrounded by new marshes, with the sea waters draining away.  Almost every parish on Flegg, finishes with the classic place-name suffix of Danish settlement - Fil-by, Stokes-by, Rolles-by, Ormes-by, Hems-by etc.  That the later settlers left so many place-names must reflect a great land grab by immigrant families.  The settlers had to fit in where they could.  their ability to exploit a drop in sea levels, and to perhaps make use of their engineering skills at draining land, must have been an advantage at settling in this area.  The drained salt-marshes proved top quality grazing land.  The marsh grasses of the Halvergate Triangle were used to fatten sheep, cattle and other livestock for centuries after. The marshes are dotted by small medieval man-made islands known as holmes (from the Old Norse holmr).

Conclusion

I've basically been making claims here, of direct descent from the North Sea Settlers that arrived in the eastern extremes of East Anglia between the 4th and 11th centuries.  I'm daring to suggest that my mother's established deep links with that area, may indicate that she has a heightened percentage of their DNA.  Of course, I could be wrong.  Perhaps there was more shuffling of genes across Britain into and out of that district during the medieval.  Perhaps the POBA 2015 survey was correct in dismissing any Danish settlement.

Why does it matter to me anyway?  I am equally proud of my Romano-British ancestry as I am of my Anglo-Saxon (or perhaps Anglo-Danish) ancestry.  The Romano-Britons seem to have largely descended from late prehistoric Britons - the people that erected all of those round barrows across Britain, that went on to build wonderful hill forts, the people that rebelled against Rome during the 1st Century AD.  However, I'm also proud of having North Sea settler ancestry.  They were the go-getters of their day, that uprooted to look for adventure.  Hard working migrants and pioneers.  Perhaps similar in some respects, to the Europeans that uprooted to settle the Americas, or dare I suggest, to the present day EU immigrants of Britain.

Years ago, I read a fascinating landscape history on this area, called The Norfolk Broads, a landscape history.  By Tom Williamson, 1997.  Unfortunately, I lent the book out.  I really would like to read this again now.

Where do we come from?

I can answer that now.  A set of maps that demonstrates the geographic spread of my direct ancestry back seven generations, to the early 18th Century.

I used a cropped relief map of England from Wikimedia Commons.  Attribution is: By Nilfanion [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons.

The red dots mark the locations of each ancestor, preferably a birth or baptism place, if not, then the next best provenance.

Grandparent Generation

All four ancestors of this generation are represented on this map.  All four are located in the county of Norfolk, in the East of England.  These ancestors were born between 1900 and 1910 in England only.  They represent two generations back from myself or my siblings.

Great Grandparent Generation

All eight ancestors of this generation are represented on this map.  Seven are located in Norfolk, in the East of England.  These ancestors were born between 1859 and 1885 in England only.  They represent three generations back from myself or my siblings.

Great Great Grandparent Generation

All sixteen ancestors of this generation are represented on this map.  They are concentrated in Norfolk again, but with single representatives each in Suffolk, Cambridgeshire, London, and Oxfordshire.  These ancestors were all born between 1830 and 1865 in England only.  They represent four generations back from myself or my siblings.


Great Great Great Grandparent Generation

Thirty of the thirty two ancestors of this generation are represented on this map.  The other two were undeclared fathers.  The main cluster is still in Norfolk, with a particularly dense cluster in the east of the county, around the River Yare.  Outside of East Anglia, I also had ancestors at this generation in Oxfordshire, London, and Lincolnshire.  These ancestors were all born between 1794 and 1837 in England.  They represent five generations back from myself or my siblings.

Great Great Great Great Grandparent Generation

Now the paper ancestry starts to fade away, with only 42 provenance ancestors out of 64 biological ancestors for this generation (seven generations back).  Therefore the map might lose some detail.  None-the-less, it seems to show the pattern settling, with most of my ancestry only deepening in Norfolk, and strongly clustering around the River Yare in East Norfolk.  Almost entirely restricted to East Anglia, except for a few emerging clusters in Wessex.

Surnames

The recorded surnames of my known direct ancestors are overwhelmingly of Medieval English form: 

Brooker, Curtis, Smith, Thacker, Tovell, Tammas, Hewitt, Lawn, Peach, Goffen, Norton, Barber, Baxter, Ellis, Hagon, Porter, Becket, Shawers, Key, Rose, Ford, Daynes, Quantrill, Crutchfield, Freeman, Larke, Waters, Ransby, Ling, Rose, Riches, Snelling, Merrison, Cossey, Shepherd, Durran, Edney, Hedges, Dove, Britiff, Harris, Tibnum, Mitchells.Briggs, Nicholes

The surnames Tovell, Thacker, Daynes, Ransby, and Hagon - all from my mother's Norfolk side, could hint at an Anglo-Danish influence.

Fan Chart up to most recent six generations:

Earlier Origins

The years and generations represented on the maps pretty much cover the past three hundred years of industrialisation and globalisation.  Much earlier, I'd expect less movement.  Therefore I feel that it would be safe to assume, that back to at least the medieval period, that my ancestry was concentrated in East Anglia, with a secondary patch in the Wessex area of England.  The recent POBA (People of the British Isles) 2015 study, suggested that the old Anglo-Saxon kingdoms continued to act as localised gene pools into the high medieval period.

Before that, we had a period of immigration waves into lowland Britain.  The POBI study, supported a number of other recent studies based on genetic profiling, archaeology, and place-name study, to suggest that Anglo-Saxon immigration accounted for no more than 30% to 40% of lowland British DNA, and that the majority of English heritage had existed in the British Isles previous - perhaps to influxes of genes during the Bronze Age or earlier.  Genetic profiling of human remains in Cambridgeshire, of people identified as 5th Century immigrant (Anglo-Saxon), suggests the closest present day profile as Dutch or / and Danish.  The kingdom of East Anglia identified with the Angles ethnicity, that historically provenance their origins to the region of Angeln, on the Danish and German borders on the Baltic coast.  However how elites identify their origin, is often not based in fact, neither is their origin always shared by their subjects.

East Anglia fell to the Danish army, and subsequently to Danelaw control periodically during the late 9th to early 11th centuries.  Some parts of East Norfolk such as Flegg, are particularly rich in Old Danish place-names.  POBA 2015 failed to identify a Danish presence with their genetic profiling, but the place-name evidence and historical sources contradict this finding.  The 7th to 9th centuries saw a slight reduction in sea levels, that enabled the draining of new lands in East Anglia for settlement.  The same districts are rich in Old Danish place-names, strongly suggesting immigrant settlement.

Conclusion

POBI 2015 suggests that I have ancestors that have lived in lowland Britain, since at least the Bronze Age, and most likely, much earlier.  That very likely ties me to lowland British ethnicities of the Bronze and Iron Ages.  The dominant power in East Anglia during the Later Iron Age was the Iceni federation, famous for the Boudiccan revolt against Rome.

POBI 2015 and other studies, suggests an Anglo-Saxon immigration that accounts for 30% - 40% of English ancestry.  My strongest cluster is concentrated in the river valleys of East Norfolk, exactly the sort of landscape that I would expect any North Sea immigrants during the 4th to 11th centuries to concentrate.  Therefore, I would expect a high probability of actual Anglo-Saxon immigrant ancestry (based on recent studies, from the Netherlands area, and perhaps North Germany / Denmark).  Based on place-name evidence the area was later heavily influenced by the Danish.

When I receive my 23andMe DNA results, based on their genetic profiling of Y chromosome, mtDNA, and on general autosomal calculators, in their ancestry results, I would expect to see overwhelming British & Irish percentage.  However, will their autosome crunchers also predict a percentage in the Scandinavian, French & German, and North-West European 23andMe categories?  As autosomal DNA is so random, what will the results display?

23andMe

Still waiting for the results.  23andMe are not giving a very rapid service.  For starters, I received a sample kit with a Netherlands return address.  That apparently was a holding depot, where they stockpile some of the European samples, so that they can ship them to the USA cheaper.  My sample reached a US lab, but continues to sit in a queue.  It has now been 37 days since I sent my registered sample off, and the box is still in a queue, waiting to be tested.  Other customers are reporting some long waits further down the process in quality control.  I expect a long wait.