title: Oocyte cohesin expression restricted to predictyate stages provides full fertility and prevents aneuploidy.
abstract: To ensure correct meiotic chromosome segregation, sister chromatid cohesion (SCC) needs to be maintained from its establishment in prophase I oocytes before birth until continuation of meiosis into metaphase II upon oocyte maturation in the adult. Aging human oocytes suffer a steep increase in chromosome missegregation and aneuploidy, which may be caused by loss of SCC through slow deterioration of cohesin [1-3]. This hypothesis assumes that cohesin expression in embryonic oocytes is sufficient to provide adequate long-term SCC. With increasing age, mouse oocytes deficient in the meiosis-specific cohesin SMC1β massively lose SCC and chiasmata [3, 4]. To test the deterioration hypothesis, we specifically and highly efficiently inactivated the mouse Smc1β gene at the primordial follicle stage shortly after birth, when oocytes had just entered meiosis I dictyate arrest. In the adult, however, irrespective of oocyte age, chiasma positions and SCC are normal. Frequency and size of litters prove full fertility even in aged females. Thus, SMC1β cohesin needs only be expressed during prophase I prior to the primordial follicle stage to ensure SCC up to advanced age of mice.
authors.affiliation: Department of Developmental and Regenerative Biology, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029-6574, USA. ekaterina.revenkova@mssm.edu
authors.forename: Ekaterina
authors.initials: E
authors.lastname: Revenkova
authors.forename: Kathleen
authors.initials: K
authors.lastname: Herrmann
authors.forename: Caroline
authors.initials: C
authors.lastname: Adelfalk
authors.forename: Rolf
authors.initials: R
authors.lastname: Jessberger
mesh_terms: D000782:Aneuploidy; D000818:Animals; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D002868:Chromosomal Proteins, Non-Histone / Q000235:genetics / Q000378:metabolism*; D005260:Female; D005298:Fertility / Q000235:genetics*; D008297:Male; D008540:Meiosis; D051379:Mice; D009865:Oocytes / Q000166:cytology / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D000097722:Cohesins
chemical_list: D018797:Cell Cycle Proteins; D002868:Chromosomal Proteins, Non-Histone; D000097722:Cohesins; C438001:Smc1l2 protein, mouse
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