[Effect of heterozygosity for insertions of homogeneously stained regions in chromosome 1 of the house mouse on synapsis in meiotic prophase].
Electron microscope analysis of surface-spread synaptonemal complexes (SC) in oocytes and spermatocytes from double cis heterozygotes for Is(HSR; 1C5)1Icg and Is(HSR; 1E3)2Icg was carried out. Aberrant chromosomes were isolated from the feral population of Mus musculus musculus of Novosibirsk. They contain homogeneously stained regions of total length of about 30% of Chr 1 mitotic metaphase. Heteromorphic bivalents of Chr1 with different lengths of the lateral elements of SC and the loop in the intermedial position were revealed in 4.4% spermatocytes and 20% oocytes of heterozygous animals. The loop size depends on the stage of meiosis: it is maximal at late zygotene and decreases up to disappearance during pachytene.
Borodin
P M
PM
Ladygina
T Iu
TIu
Gorlov
I P
IP
D000818:Animals; D002875:Chromosomes; D004251:DNA Transposable Elements; D006579:Heterozygote; D008297:Male; D008540:Meiosis; D051379:Mice; D008854:Microscopy, Electron; D009865:Oocytes; D013090:Spermatocytes; D013194:Staining and Labeling; D013573:Synaptonemal Complex
D004251:DNA Transposable Elements
Vliianie geterozigotnosti po insertsiiam gomogenno okrashivaemykh raĭonov v 1-ĭ khromosome domovoĭ myshi na sinapsis v profaze meĭoza.