My paternal ancestors’ European journey – from the Caspian Steppes to Celtiberia

In a previous post, I used an analysis of my Y chromosome DNA to trace the journey of my paternal ancestors from Y-chromosomal Adam, who lived in West Africa around 275,000 years ago (275 kya), to the founder of the R1b sub-haplogroup R-L23, who was born on the Caspian around 4,400 BC (6.4 kya). In this post, I continue my paternal ancestral journey to the most recently identified haplogroup founder: a Celtiberian living in what is now Portugal around 510 BCE. The sequence of Y SNPs defining my haplotree are shown in the following map. It summarizes this journey from R-L23 (4,400 BCE) to the most recent haplogroup founder (510 BCE), and continues on from the map published in the previous post.

There is an immense amount of recent research on European Bronze Age genetics and migrations and a very considerable unfinished debate on how to interpret the evidence. New evidence is being published almost weekly, as increasing numbers of ancient European remains are analysed and Y haplogroup identified. So this post will only aim to describe the big picture as best I can summarize it, and details and perhaps even some of the big picture will likely change in the future.

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My paternal ancestors – from Adam via ice age Siberia to the steppes of Europe

In earlier posts, I discussed how I have used an analysis of my Y chromosome DNA to identify my paternal ancestors all the way back to Y-chromosomal Adam, the most recent common ancestor of all men alive today. The following map summarizes my Y haplogroup ancestors from Y-chromosomal Adam down to those who left Africa around 70 thousand years ago (70 kya) and headed east through India and South East Asia and then up through China into ice age Siberia and then across to the Ukrainian steppeland north of the Black Sea.

I was originally going to continue this story all the way across Europe to the Iberian Peninsula and up to Ireland and Scotland, but I will keep that for a later post. I have discovered that there is an immense amount of recent research on European Bronze Age genetics and migrations and a very considerable unfinished debate on how to interpret the evidence. So it may take me a little while to come to grips with it. (A follow-up post is now available at my-paternal-ancestors-european-journey-the-caspian-steppes-to-celtiberia)

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Tracing my paternal ancestors through Y DNA

The human Y chromosome is a male-specific sex chromosome. When mutations (errors in the copying process) arise in the Y chromosome, they are passed down directly from father to son in a direct male line of descent and define a tree of Y “haplogroups”. The mutations on the Y chromosome can thus be used to trace our paternal ancestors all the way back to the most recent common paternal ancestor of all men alive today, Y chromosomal Adam.

When I first got interested in genetic genealogy around 2010, I had my DNA tested by the National Genographic Project, funded by the National Geographic to collect over a million DNA samples to map the patterns of human migration across the world. This project measured mutations known as short tandem repeats (STRs) at 12 sites, and gave a statistical prediction of my Y-haplogroup, R1b (M343) and subclade R-M269. A year later I upgraded my Y-DNA analysis to 44 STRs with Ancestry.com. At the time, I decided that I would wait for the technology to improve and the cost to drop and do a more comprehensive test which would definitively determine my Y haplogroup.

And so last year I did the Big Y-700 test with FamilyTreeDNA which examines 700 short tandem repeats, and over 200,000 single-nucleotide polymorphisms(SNPs) identifying known haplogroups as well as millions of locations where there may be new branch markers on the Y chromosome. This company claims to have the world’s largest genealogical YDNA database with over 2 million people included.

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Y chromosomal Adam

Y-chromosomal Adam is the name given to the patrilineal most recent common ancestor (MRCA) of modern humans. In other words, he was the man from whom all living humans today descend, on their father’s side, and through the fathers of those fathers and so on, back until all lines converge on one person. He is the male counterpart of Mitochondrial Eve, who,lived in north-western Botwsana around 177,000 years ago (confidence interval ± 11,300 years).

When I did my first Y-DNA test in 2012 with the National Geographic’s  National Genographic Project, it gave a date of 60,000 years ago (60 kya) for Y-chromosomal Adam. This was already outdated, as other recent estimates around that time gave dates ranging from 120 to 160 kya. By definition, it is not necessary and highly unlikely that Y-chromosomal Adam and Mitochondrial Eve lived at the same time or in the same location.

However, in 2013 scientists announced the discovery of an extremely ancient Y DNA haplogroup from a sample submitted for an African-American man in the USA.  Y-chromosomal haplogroups are defined by mutations in the non-recombing portions of DNA from the Y chromosome. These mutations accumulate at the rate of roughly two per generation. The accumulation of mutations in the descendants of Y-chromosomal Adam allow us to map out the major branches of the family tree in terms of Y-haplogroups. This discovery adds a completely new branch to the Y-DNA family tree and pushes back the age of Y-chromosomal Adam to around 250 to 300 kya.

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Becoming Human Part 2

This is the second part of a post summarizing current understanding of the evolution of humans. In the previous post, I outlined the evolution of pre-human species from the first monkeys around 35 million years ago (Mya) to the appearance of the first human species around 2 Mya. This post takes a look across the evolution of humans from the appearance of the first human species Homo habilis to the appearance of anatomically modern Homo sapiens sapiens around 250 thousand years ago. The following figure summarizes the evolution of humans over the last 2 million years, based on [1] with some modifications to take account of some recent discoveries.

The evolution of humans (the genus Homo) over the last 2 million years. Updated from Figure in Wikimedia. User:Conquistador, User:Dbachmann / CC BY-SA. (https://creativecommons.org/licenses/by-sa/4.0)- . The late survival of robust australopithecines (Paranthropus) alongside humans until about 1.2 Mya is indicated in purple. The rapid “Out of Africa” expansion of H. sapiens is indicated at the top of the diagram, with admixture indicated with Neanderthals, Denisovans, and unspecified archaic African hominins.

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Becoming Human Part 1

Our understanding of the evolution of us modern humans has changed dramatically in the last few years as ancient genomes are decoded and we discover that humans, Neanderthals and Denisovans interbred, and also in the remote past interbred with previously unknown “superarchaic” human groups.  Scientists are also discovering new species of extinct hominids, and no doubt will continue to shed further light on our origins. Just to try to sort out the big picture in my own mind and to put these various discoveries in context, I’ve tried to summarize what we think we know, or at least what the evidence available to date suggests. This will no doubt continue to change.

This is the first of two posts and summarizes the evolution of pre-human species from the first monkeys around 35 million years ago (Mya) to the appearance of the first human species around 2 Mya. A following post will summarize the evolution of humans from the appearance of the first human species Homo habilis 2 Mya to the appearance of anatomically modern Homo sapiens sapiens around 250 thousand years ago and  mitochondrial Eve, who lived around 178,000 years ago.

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My maternal ancestors – from Eve via ice age Europe to Victorian England

In an early post on this blog, I summarized my maternal-line ancestors and where and when they lived. In the last 6 years, there have been substantial revisions to estimates of the dates associated with these mitochondrial DNA (mtDNA) haplogroup founders, and revisions to the mtDNA haplogroup tree (deep-maternal-ancestry-and-mtdna) and this post provides an update. I am a member of mtDNA haplogroup U5, which is one of nine native European haplogroups stemming from haplogroup U which most likely arose in the Near East, and spread into Europe in a very early expansion. The presence of haplogroup U5 in Europe pre-dates the last ice age and the expansion of agriculture in Europe. Today, about 11% of modern Europeans are the direct maternal descendants of the founder U5 woman. They are particularly well represented in western Britain and Scandinavia. My more recent maternal ancestors were part of the population that tracked the retreat of ice sheets from Europe at the end of the last ice age and re-colonized Britain about 12,000 years ago.

The mtDNA sequence at the root of each haplogroup arose from one or more mutations in the mtDNA of just one woman, and the age of the associated haplogroup gives the time in the past when this specific woman lived. To emphasise that the maternal clan founders were real individuals, I have used the names given to them by Sykes [1] and Oppenheimer [2] and given my own names to the more recent subgroup founders. The Table below summarizes these founders, dates and locations and is followed by brief biographies. The haplogroups are identified by the labels used in Build 17 of the ISOGG mtDNA tree which can be accessed at http://phylotree.org/ [3]. Dates in the table below have been updated using most recent available dating estimates as described in my previous post deep-maternal-ancestry-and-mtdna.

The migration path out of Africa into Europe of the “grandmothers” linking mitochondrial Eve through to Ursula (U5) is shown on a map in my previous post deep-maternal-ancestry-and-mtdna. The subsequent migration from Europe to Britain is shown in the map below.

Figure 1. Migration path of my maternal ancestors from Ursula (U5) to Viviane (410 CE). A map of the earlier migration from mitochondrial Eve to U5 is included in an earlier post.

Updated biographies of my maternal haplogroup great* grandmothers follow below.

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Our Asgardian ancestors

I grew up reading northern European myths and legends, including tales of Odin, Thor, and the other gods of Asgard. I was largely unaware of the Marvel comics appropriation of Thor and other Asgardians as superheros until the Marvel cinematic universe started to hit the big screens in the last 12 years.

Loki, Thor and Odin (from the Marvel Cinematic Universe)

I have only recently come across the growing evidence that an Asgardian was one of our ancestors, way back near the beginning of the evolution of life, when the first eukaryotic cell appeared. Eukaryotes are organisms whose cells contain membrane-wrapped internal structures, such as a nucleus, unlike prokaryotes (Bacteria and Archaea), which have no membrane-bound internal structures.

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