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Letter

The Pattern of Polymorphism on Human Chromosome 21

Molecular and Computational Biology, University of Southern California, Los Angeles, California 90089, USA

Polymorphism data from 20 partially resequenced copies of human chromosome 21—more than 20,000 polymorphic sites—were analyzed. The allele-frequency distribution shows no deviation from the simplest population genetic model with a constant population size (although we show that our analysis has no power to detect population growth). The average rate of recombination per site is estimated to be roughly one-half of the rate of mutation per site, again in agreement with simple model predictions. However, sliding-window analyses of the amount of polymorphism and the extent of linkage disequilibrium (LD) show significant deviations from standard models. This could be due to the history of selection or demographic change, but it is impossible to draw strong conclusions without much better knowledge of variation in the relationship between genetic and physical distance along the chromosome.

¹ Present address: Human Genetics Center, School of Public Health, University of Texas, Health Science Center, Houston, TX 77030, USA.

² Corresponding author.
E-MAIL hinnan{at}sph.uth.tmc.edu; FAX (713) 500-0900.

[Supplemental material is available online at www.genome.org.]

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