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MAU2 sister chromatid cohesion factor OKDB#: 4948
 Symbols: MAU2 Species: human
 Synonyms: SCC4, MAU2L, mau-2, KIAA0892  Locus: 19p13.11 in Homo sapiens


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General Comment
General function Chromosome organization
Comment
Cellular localization Nuclear
Comment
Ovarian function
Comment
Expression regulated by
Comment
Ovarian localization Oocyte
Comment Localisation of the SMC loading complex Nipbl/Mau2 during mammalian meiotic prophase I. Visnes T 2013 et al. Evidence from lower eukaryotes suggests that the chromosomal associations of all the structural maintenance of chromosome (SMC) complexes, cohesin, condensin and Smc5/6, are influenced by the Nipbl/Mau2 heterodimer. Whether this function is conserved in mammals is currently not known. During mammalian meiosis, very different localisation patterns have been reported for the SMC complexes, and the localisation of Nipbl/Mau2 has just recently started to be investigated. Here, we show that Nipbl/Mau2 binds on chromosomal axes from zygotene to mid-pachytene in germ cells of both sexes. In spermatocytes, Nipbl/Mau2 then relocalises to chromocenters, whereas in oocytes it remains bound to chromosomal axes throughout prophase to dictyate arrest. The localisation pattern of Nipbl/Mau2, together with those seen for cohesin, condensin and Smc5/6 subunits, is consistent with a role as a loading factor for cohesin and condensin I, but not for Smc5/6. We also demonstrate that Nipbl/Mau2 localises next to Rad51 and ?H2AX foci. NIPBL gene deficiencies are associated with the Cornelia de Lange syndrome in humans, and we find that haploinsufficiency of the orthologous mouse gene results in an altered distribution of double-strand breaks marked by ?H2AX during prophase I. However, this is insufficient to result in major meiotic malfunctions, and the chromosomal associations of the synaptonemal complex proteins and the three SMC complexes appear cytologically indistinguishable in wild-type and Nipbl (+/-) spermatocytes. ///////////////////////// [
Follicle stages
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created: Dec. 1, 2013, 11:15 a.m. by: hsueh   email:
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last update: Nov. 10, 2016, 1:45 p.m. by: hsueh    email:



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