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Thread: Danish Population Homogeneity Revealed by Genomic Study

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    Nationwide Genomic Study in Denmark Reveals Remarkable Population Homogeneity

    Denmark has played a substantial role in the history of Northern Europe. Through a nationwide scientific outreach initiative, we collected genetic and anthropometrical data from ~800 high school students and used them to elucidate the genetic makeup of the Danish population, as well as to assess polygenic predictions of phenotypic traits in adolescents.
    We observed remarkable homogeneity across different geographic regions, although we could still detect weak signals of genetic structure reflecting the history of the country.
    Denmark presented genomic affinity with primarily neighboring countries with overall resemblance of decreasing weight from Britain, Sweden, Norway, Germany and France.
    A Polish admixture signal was detected in Zealand and Funen and our date estimates coincided with historical evidence of Wend settlements in the south of Denmark.
    We also observed considerably diverse demographic histories among Scandinavian countries, with Denmark having the smallest current effective population size compared to Norway and Sweden.
    Finally, we found that polygenic prediction of self-reported adolescent height in the population was remarkably accurate (R 2 = 0.639±0.015).
    The high homogeneity of the Danish population could render population structure a lesser concern for the upcoming large-scale gene-mapping studies in the country.
    Full Article(Genetics)

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    People from Denmark are genetically quite similar. A country in which Denmark impacted significantly genetically is the United Kingdom.



    The truth is that Danes are the closest genomic affinity with the following European groups in this rank, the British, Swedish, Norwegians, Germans and French folks according to the study.

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    I’m hardly surprised by high genetic homogeneity among a population of 5,6 million in an area of about 43.000 km², to be honest, that was to be expected.

    But what I don’t understand is, why they would use a “German” cluster that barely consists half of Germans proper(including Austrians), to infer admixture into the Danes.
    Look at the GER cluster cake diagram on the the left hand site and the apparent components:




    Then look at this picture from the same study(click to enlarge):



    On the left, Germans(DE) and to a somewhat lesser degree, Austrians(AT), cluster with other Germanics/Northwestern Europeans, whereas especially Hungarians(HU) and the French(FR), that apparently constitute together at least a fourth of the “GER” cluster, plot quite far from Germanics.

    That way it’s hardly surprising if a "German" cluster allegedly contributed barely more to the Danish gene pool than the French one.
    On the right of the picture, you can actually see how most Germans and most Danes(especially from Jutland) actually cluster together. Their admixture conclusion is not even supported by their own data.


    Also: Scandinavians are vastly more Central European ancestry than, well, Central Europeans?
    And Brits have 32%, the Dutch still 20% of Eastern European? For comparison: Germans, actually bordering Eastern Europe have, in this study, 17%.
    See Table 2 and the following map:



    From that, it’s almost certain their ascription of ancestral components to clusters is quite wrong, also.

    That’s some very flawed study in these respects.
    And the day they sold us out, Our hearts grew cold
    'Cause we were never asked, No brother, we were told!
    What do they know of Europe, Who only Europe know?



    Ancient DNA: List of All Studies analyzing DNA of Ancient Tribes and Ethnicities(post-2010)


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