title: [Instability of B-chromosomes in somatic and germline cells of Apodemus peninsulae].
abstract: Instability of B-chromosomes was estimated in somatic and germline cells of samples Apodemus peninsulae from different localities of the species range. In 84 out of 188 animals (45%), in cells assessed for B-chromosome mosaicism, bone marrow cells with different B-chromosome number were observed. The numbers of B-chromosomes in spermatocytes at the pachytene stage were estimated in ten males. It was shown that the average number of B-chromosomes and the number of cell clones in germline cells was higher than the corresponding numbers in bone marrow cells. The higher number of B-chromosomes and their higher variability in germline cells than in somatic cells suggest the existence of a mechanism of premeiotic accumulation of B-chromosomes in spermatogenesis of A. peninsulae.
authors.forename: Iu M
authors.initials: IuM
authors.lastname: Borisov
mesh_terms: D000818:Animals; D043171:Chromosomal Instability / Q000502:physiology*; D033481:Chromosomes, Mammalian / Q000235:genetics* / Q000378:metabolism; D005260:Female; D008297:Male; D051189:Murinae / Q000235:genetics* / Q000378:metabolism; D049471:Pachytene Stage / Q000502:physiology*; D013090:Spermatocytes / Q000166:cytology / Q000378:metabolism; D013091:Spermatogenesis / Q000502:physiology*