SEX CHROMOSOME ACTIVATION DURING SPERMATOGENESIS
نویسندگان
چکیده
منابع مشابه
Sex chromosome activation during spermatogenesis.
INACTIVATION of chromosomal elements is a process which takes place in various organisms, cell types, and cell cycle stages. The reasons for chromosome inactivation, which is superimposed on the more specific level of gene control, are different for the various systems. Dosage compensation in female mammals us. mitotic chromosome shut-off are the extreme cases. Since in many systems every chrom...
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Genes with male- and testis-enriched expression are under-represented on the Drosophila melanogaster X chromosome. There is also an excess of retrotransposed genes, many of which are expressed in testis, that have "escaped" the X chromosome and moved to the autosomes. It has been proposed that inactivation of the X chromosome during spermatogenesis contributes to these patterns: genes with a be...
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An ultrastructural study was performed on the sex chromosomes (male X1X2X3O) during the spermatogenesis of Tegenaria domestica (Arachnida, Agelenidae). This study was carried out using random and serially cut sections. During pachytene and diplotene the three X chromosomes are longitudinally paired. Each of these consists of a central core of condensed chromatin, surrounded by a field of dense ...
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Based on the formation of the XY body at pachytene and expression studies of a few X-linked genes, the X and Y chromosomes seem to undergo transcriptional inactivation during mammalian spermatogenesis. However, the extent and the mechanism of X and Y inactivation are not known. Here, we show that both the X and Y chromosomes undergo sequential changes in their histone modifications beginning at...
متن کاملDistribution of the sex chromosome during mouse spermatogenesis in testis tissue sections
During mammalian spermatogenesis, spermatogenic cells undergo mitotic division and are subsequently divided into haploid spermatids by meiotic division, but the dynamics of sex chromosomes during spermatogenesis are unclear in vivo. To gain insight into the distribution of sex chromosomes in the testis, we examined the localization of sex chromosomes before and after meiosis in mouse testis sec...
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ژورنال
عنوان ژورنال: Genetics
سال: 1974
ISSN: 1943-2631
DOI: 10.1093/genetics/78.1.323