149: Tracing ancient Y chromosome variation

Kivisild T et al., Hum Genet (2017) 136:529–546 - Review of how high-throughput sequencing of ancient human remains has enabled genome-scale study of male-specific Y chromosome variation, the methodological challenges of working with ancient Y data, and examples of regional continuity and turnover in Y haplogroups across Eurasia and the Americas. Key terms: ancient DNA, Y chromosome, haplogroups, population history, high-throughput sequencing.

Study Highlights:
High-throughput sequencing and capture methods now allow recovery of ancient Y chromosome sequences but face challenges from low endogenous DNA, post-mortem damage, repetitive Y regions and ascertainment bias of SNP-capture panels. Shotgun sequencing is preferred where human DNA content is high, while capture approaches increase overlapping SNP coverage but cannot discover novel variants. Ancient Y sequences from late Pleistocene and Holocene Eurasia map to major non-African founding lineages and reveal shifts in haplogroup composition through the Neolithic and Bronze Age, notably later expansions of R1a/R1b. Ancient American Y data confirm early presence of Q and C lineages and show distinct Palaeo-Eskimo Q sub-clades.

Conclusion:
Ancient Y chromosome data complement autosomal and mitochondrial evidence by revealing male-lineage continuity and turnover across time and space, but robust inference requires attention to damage, coverage, repeat regions and ascertainment bias and broader sampling from underrepresented regions.

Music:
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Article title:
The study of human Y chromosome variation through ancient DNA

First author:
Kivisild T

Journal:
Hum Genet (2017) 136:529–546

DOI:
10.1007/s00439-017-1773-z

Reference:
Kivisild T. The study of human Y chromosome variation through ancient DNA. Hum Genet (2017) 136:529–546. DOI 10.1007/s00439-017-1773-z

License:
This episode is based on an open-access article published under the Creative Commons Attribution 4.0 International License (CC BY 4.0) – https://creativecommons.org/licenses/by/4.0/

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QC:
This episode was checked against the original article PDF and publication metadata for the episode release published on 2025-09-26.

QC Scope:
- article metadata and core scientific claims from the narration
- excludes analogies, intro/outro, and music
- transcript coverage: Audited the transcript's coverage of ancient Y chromosome sequencing methods, damage authentication, and major demographic inferences (Europe, the Americas), plus Native American and Paleo-Eskimo lineages as described in the article.
- transcript topics: HTS challenges for ancient Y chromosome (repeats and X-Y homology); Shotgun sequencing vs capture-based enrichment; Damage authentication via end-of-read C to T patterns; Y-chromosome haplogroup history in ancient Europe (G, H, I, J, R1a/R1b, C); Bronze Age Yamnaya migrations and male-biased turnover; Native American Y-chromosome lineages Q and C and Malta Boy dual ancestry

QC Summary:
- factual score: 10/10
- metadata score: 10/10
- supported core claims: 7
- claims flagged for review: 0
- metadata checks passed: 4
- metadata issues found: 0

Metadata Audited:
- article_doi
- article_title
- article_journal
- license

Factual Items Audited:
- DOI in metadata matches the canonical article DOI
- Article title in metadata matches the canonical article title
- Article journal in metadata matches the canonical journal citation
- License in metadata matches the article's CC BY 4.0 variant

QC result: Pass.