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. 1986 Jun;113(2):417–432. doi: 10.1093/genetics/113.2.417

Isolation and Characterization of a Mouse Y Chromosomal Repetitive Sequence

Yutaka Nishioka 1,2, Estelle Lamothe 1,2
PMCID: PMC1202847  PMID: 3721197

Abstract

The Y chromosome plays a dominant role in mammalian sex determination, and characterization of this chromosome is essential to understand the mechanism responsible for testicular differentiation. Male mouse genomic DNA fragments, cloned into pBR322, were screened for the presence of Bkm (a female snake satellite DNA)-related sequences, and we obtained a clone (AC11) having a DNA fragment from the mouse Y chromosome. In addition to a Bkm-related sequence, this fragment contained a Y chromosomal repetitive sequence. DNA isolated from the XX sex-reversed male genome produced a hybridization pattern indistinguishable to that obtained with normal female DNA, suggesting that the AC11 sequence is not contained within the Y chromosomal DNA present in the sex-reversed male genome. Based on the hybridization patterns against mouse Y chromosomal DNA, AC11 classified 16 inbred laboratory strains into two categories; those with the Mus musculus musculus type Y chromosome and those with the M.m. domesticus type Y chromosome. Three European subspecies of Mus musculus ( M.m. brevirostris, M.m. poschiavinus and M.m. praetextus) possessed the M.m. domesticus type Y chromosome, whereas the Japanese mouse, M.m. molossinus, had the M.m. musculus type Y chromosome. The survey was also extended to six other species that belong to the genus Mus, of which M. spretus and M. hortulanus showed significant amounts of AC11-related sequences in their Y chromosomes. The male-specific accumulation of AC11-related sequences was not found in M. caroli, M. cookii, M. pahari or M. platythrix . This marked difference among Mus species indicates that the amplification of AC11-related sequences in the mouse Y chromosome was a recent evolutionary event.

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Selected References

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