Molecular Biology and Evolution 17:804-812 (2000)
© 2000 Society for Molecular Biology and Evolution
Original Articles |
Sex Chromosomal Transposable Element Accumulation and Male-Driven Substitutional Evolution in Humans
Max-Planck-Institute for Evolutionary Anthropology, Leipzig, Germany
Abstract
We sequenced the genomic region containing the human Y-linked zinc finger gene (ZFY). Comparison of ZFY to the related region on the X chromosome (ZFX) and to autosomal sequences reveals a significant accumulation of transposable elements on the sex chromosomes. In addition, five times as many retroviruslike elements (RLEs) are present in the ZFY region as in the ZFX region. Thus, transposable elements accumulate more rapidly on the sex chromosomes, and the insertion of RLEs may occur more frequently in the male than in the female germ line. When the accumulation of substitutions in Alu elements was analyzed, it was found that the Alu elements at the Y-chromosomal locus diverged significantly faster than those at the X-chromosomal locus, whereas the divergence of autosomal Alu elements was intermediate. The male-to-female mutation rate ratio was estimated to be 2.5.
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