High frequency of X-Y chromosome dissociation in primary spermatocytes of F1hybrids between Japanese wild mice (Mus musculus molossinus) and inbred laboratory mice
作者:
H.T. Imai,
Y. Matsuda,
T. Shiroishi,
K. Moriwaki,
期刊:
Cytogenetic and Genome Research
(Karger Available online 1981)
卷期:
Volume 29,
issue 3
页码: 166-175
ISSN:1424-8581
年代: 1981
DOI:10.1159/000131565
出版商: S. Karger AG
数据来源: Karger
摘要:
In the hybrids between Japanese wild mice (Mus musculus molossinus) and inbred laboratory mice (BALB/c and B10.BR, which were probably derived from M. m. domesticus), the X and Y chromosomes dissociated precociously at the first meiotic metaphase in some 70% of spermatocytes; that percentage was only 8.9% in inbred laboratory mice and 21.1% in wild mice. X-Y dissociation began at least at early diakinesis and continued during metaphase I (MI). Some autosomes of the hybrid (10.1%) and BALB/c (10.6%) mice also dissociated precociously, but there was no distinctive correlation between X-Y and autosomal dissociation. In BIO or B6 congenic lines with a Y chromosome from wild M. m. molossinus, there was an apparent tendency for the percentage of precocious X-Y dissociation to decrease with an increasing number of back cross generations. Based on these observations we concluded that: 1. the X-Y dissociation found is genetically controlled, perhaps by multiple genes; 2. these genes are located on autosomes and are active only when they are heterozygous; 3. the frequent dissociation of the sex chromosomes neither affects male fertility nor induces non-disjunction of the X and Y chromosomes, though it significantly reduces testes weight.
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