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High mutation rates have driven extensive structural polymorphism among human Y chromosomes.

Sjoerd Repping1, Saskia K M van Daalen, Laura G Brown

  • 1Howard Hughes Medical Institute, Whitehead Institute, and Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02142, USA.

Nature Genetics
|February 28, 2006
PubMed
Summary
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Human Y chromosomes exhibit high rates of structural mutation, driving significant genetic diversity. These findings reveal rapid changes in regions like heterochromatin and gene arrays over evolutionary time.

Area of Science:

  • Genetics
  • Human Evolution
  • Genomics

Background:

  • Structural polymorphism in the human genome is known, but the rates of these changes are poorly understood.
  • Human Y chromosomes, inherited clonally, allow for detailed genealogical reconstruction and mutation rate analysis.

Purpose of the Study:

  • To investigate the kinetics of structural variation in the human genome.
  • To determine the rates of large-scale mutations on the human Y chromosome.

Main Methods:

  • Analysis of structural variation across 47 branches of a human Y chromosome genealogical tree.
  • Quantification of mutations in specific Y chromosome regions including distal-Yq heterochromatin, TSPY gene array, IR3/IR3 region, and AZFc region.

Main Results:

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  • Extensive structural variation was observed in four key Y chromosome regions, with numerous large-scale mutations.
  • Calculated lower bounds for mutation rates per father-to-son Y transmission: distal-Yq heterochromatin (> or = 2.3 x 10(-4)), TSPY gene array (> or = 4.4 x 10(-4)), IR3/IR3 region (> or = 2.3 x 10(-4)), and AZFc region (> or = 3.8 x 10(-4)).
  • Limited variation in copy number of Y-linked genes suggests potential selective constraints.

Conclusions:

  • High mutation rates are a primary driver of structural polymorphism in human Y chromosomes.
  • The observed structural diversity points to rapid evolutionary changes, while gene copy number stability may indicate functional constraints.