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Thread: Cassidy's Thesis - Implications for L21, DF27 etc.

  1. #1
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    Cassidy's Thesis - Implications for L21, DF27 etc.

    This post is in reference to Cassidy's thesis as announced here:

    https://anthrogenica.com/showthread....l=1#post488883

    Abstract:
    This thesis provides an initial demographic scaffold for Irish prehistory based on the palaeogenomic analysis of 93 ancient individuals from all major periods of the island's human occupation, sequenced to a median of 1X coverage. ADMIXTURE and principal component analysis identify three ancestrally distinct Irish populations, whose inhabitation of the island corresponds closely to the Mesolithic, Neolithic and Chalcolithic/Early Bronze Age eras, with large scale migration to the island implied during the transitionary periods. Haplotypic-based sharing methods and Y chromosome analysis demonstrate strong continuity between the Early Bronze Age and modern Irish populations, suggesting no substantial population replacement has occurred on the island since this point in time. The Mesolithic population shares high genetic drift with contemporaries from France and Luxembourg and shows evidence of a severe inbreeding bottleneck, apparent through runs of homozygosity (ROH). Substantial contributions from both Mediterranean farming groups and northwestern hunter-gatherers are evident in the Neolithic Irish population. Moreover, evidence for local Mesolithic survival and introgression in southwestern Ireland, long after the commencement of the Neolithic, is also implied in haplotypic-analysis. Societal complexity during the Neolithic is suggested in patterns of Y chromosome and autosomal structure, while the identification of a highly inbred individual through ROH analysis, retrieved from an elite burial context, strongly suggests the elaboration and expansion of megalithic monuments over the course of the Neolithic was accompanied in some regions by dynastic hierarchies. Haplotypic affinities and distributions of steppe-related introgression among samples suggest a potentially bimodal introduction of Beaker culture to the island from both Atlantic and Northern European sources, with southwestern individuals showing inflated levels of Neolithic ancestry relative to individualised burials from the north and east. Signals of genetic continuity and change after this initial establishment of the Irish population are also explored, with haplotypic diversification evident between both the Bronze Age and Iron Age, and the Iron Age and present day. Across these intervals selection pressures related to nutrition appear to have acted, with variants involved in lactase persistence and skin depigmentation showing steady increases in frequency through time.
    My take:

    1. That three distinct populations existed in the Mesolithic, Neolithic and Chalcolithic/Early Bronze Age is of no surprise and follows the same pattern seen on the continent. All three were associated with large scale migrations.
    2. The strong Y chromosome continuity between the Bronze Age and modern Ireland obviously refers to R-L21 as it is the major modern clade and has already appeared in all three Rathlin Island samples.
    3. Strong Mesolithic survival and introgression in southwestern Ireland, along with societal complexity in the Neolithic based on the Y chromosome could point to a I2a/G2a or I2a2/I2a1 division.
    4. For the purposes of this thread, the interesting part of the abstract is as follows: "Haplotypic affinities and distributions of steppe-related introgression among samples suggest a potentially bimodal introduction of Beaker culture to the island from both Atlantic and Northern European sources, with southwestern individuals showing inflated levels of Neolithic ancestry relative to individualised burials from the north and east."

    Could the differences seen in steppe-related introgression also be related to differences in subclades of R-P312? Perhaps R-DF27 entering southerwestern Ireland from northwestern France and R-L21 entering from the Low Countries? Thoughts?
    Last edited by R.Rocca; 09-17-2018 at 07:19 PM.
    Paternal: R1b-U152 >> L2 >> FGC10543 >> PR5365, Pietro Rocca, b. 1559, Agira, Sicily, Italy
    Maternal: H4a1-T152C!, Maria Coto, b. ~1864, Galicia, Spain
    Mother's Paternal: J1+ FGC4745/FGC4766+ PF5019+, Gerardo Caprio, b. 1879, Caposele, Avellino, Campania, Italy
    Father's Maternal: T2b-C150T, Francisca Santa Cruz, b.1916, Garganchon, Burgos, Spain
    Paternal Great (x3) Grandfather: R1b-U106 >> L48 >> CTS2509, Filippo Ensabella, b.~1836, Agira, Sicily, Italy

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  3. #2
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    I look forward to seeing the paper. I am also really looking forward to the new Olalde et al paper on ancient Iberia.

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    I found this archived here from 2016 in a post by Paul using 2011 Busby data:

    West Ireland -- 67 samples

    L21 = 73.1%
    U106 = 4.5%
    U152 = 1.5%
    P312 (non L21/ non U152) = 7.5%


    South Ireland -- 89 samples

    L21 = 74.2%
    U106 = 3.4%
    U152 = 1.1%
    P312 (non L21/ non U152) = 7.9%


    East Ireland -- 149 samples

    L21 = 71.1%
    U106 = 6.7%
    U152 = 4%
    P312 (non L21/ non U152) = 7.4%


    North Ireland -- 72 samples

    L21 = 79.2%
    U106 = 4.2%
    U152 = 1.4%
    P312 (non L21/ non U152) = 4.2%

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    Some relevant papers indicating an Atlantic and Rhine Bell Beaker tradition

    Before the Branches: towards a new understanding of (Late) Proto-Indo-European and Copper-to-Bronze Age Europe

    https://www.academia.edu/22590425/Be...nze_Age_Europe

    THE ARRIVAL OF THE BELL BEAKER SET IN BRITAIN AND IRELAND

    https://www.academia.edu/24957136/TH...IN_AND_IRELAND

    Beakers into Bronze: Tracing connections between Iberia and the British Isles 2800-800 BC

    https://www.academia.edu/22189046/Be...es_2800-800_BC

    Behind the warriors: Bell Beakers and identities in Atlantic Europe (third-millennium B.c.)

    https://www.academia.edu/26779296/Be...llennium_B.C._

    Burial practices in Ireland during the late third millennium BC : Connecting new ideologies with local expressions

    https://www.academia.edu/35797556/Bu...al_expressions

    The background of the Celtic languages: theories from archaeology and linguistics

    http://www.aemap.ac.uk/static/media/...e-bamfflet.pdf
    Gerard Corcoran
    R1b-DF21-S5456-S6166, H1C1

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    It could also be that different R-L21 sublcades (R-DF13 etc). were different routes as well.
    Paternal: R1b-U152 >> L2 >> FGC10543 >> PR5365, Pietro Rocca, b. 1559, Agira, Sicily, Italy
    Maternal: H4a1-T152C!, Maria Coto, b. ~1864, Galicia, Spain
    Mother's Paternal: J1+ FGC4745/FGC4766+ PF5019+, Gerardo Caprio, b. 1879, Caposele, Avellino, Campania, Italy
    Father's Maternal: T2b-C150T, Francisca Santa Cruz, b.1916, Garganchon, Burgos, Spain
    Paternal Great (x3) Grandfather: R1b-U106 >> L48 >> CTS2509, Filippo Ensabella, b.~1836, Agira, Sicily, Italy

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    I think that's better to wait and see the paper... I realize that everything hypothesized could be possible.

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    Quote Originally Posted by Romilius View Post
    I think that's better to wait and see the paper... I realize that everything hypothesized could be possible.
    Bit of a wait though, really don't think I can bite my tongue for that long and there are plenty here far more vociferous than me : )

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    the bit that got my curiosity was this statement

    Haplotypic-based sharing methods and Y chromosome analysis demonstrate strong continuity between the Early Bronze Age and modern Irish populations, suggesting no substantial population replacement has occurred on the island since this point in time.
    since I thought the Irish DNA Atlas Project had detected a fairly large Scandinavian element in the modern Irish which presumably arrived with Vikings ?

    However thinking about it she specified population replacement which that clearly wasn't, but this does suggest there was a population replacement during the Bronze age the same as Britain.
    Last edited by jdean; 09-18-2018 at 06:50 PM.

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    I intend to go an see Lara Cassidy talk on 19 October at GGI. I am not able to rearrange my work for her talk on Friday morning in Croke Park - is anyone else going?

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    Quote Originally Posted by R.Rocca View Post
    It could also be that different R-L21 sublcades (R-DF13 etc). were different routes as well.
    That doesn't seem likely to me. I think it could be that some I2a came up to SW Ireland with an early Iberian, collective tomb type of Bell Beaker.

    The Rathlin Island guys were pretty high in steppe dna. They were L21 and buried in single graves.

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