Nucleolar Expression and Chromosomal Associations in Robertsonian Spermatocytes of Mus musculus domesticus.

Abstract:

:We studied and compared the nucleolar expression or nucleoli from specific bivalents in spermatocytes of the standard Mus musculus domesticus 2n=40, of Robertsonian (Rb) homozygotes 2n = 24 and heterozygotes 2n = 32. We analyzed 200 nuclear microspreads of each specific nucleolar chromosome and spermatocyte karyotype, using FISH to identify specific nucleolar bivalents, immunofluorescence for both fibrillarin of the nucleolus and the synaptonemal complex of the bivalents, and DAPI for heterochromatin. There was nucleolar expression in all the chromosomal conditions studied. By specific nucleolar bivalent, the quantitative relative nucleolar expression was higher in the bivalent 12 than in its derivatives, lower in the bivalent 15 than in its derivatives and higher in the bivalent 16 than its Rb derivatives. In the interactions between non-homologous chromosomal domains, the nucleolar bivalents were preferentially associated through pericentromeric heterochromatin with other bivalents of similar morphology and sometimes with other nucleolar bivalents. We suggest that the nucleolar expression in Rb nucleolar chromosomes is modified as a consequence of different localization of ribosomal genes (NOR) in the Rb chromosomes, its proximity to heterochromatin and its associations with chromosomes of the same morphology.

journal_name

Genes (Basel)

journal_title

Genes

authors

López-Moncada F,Tapia D,Zuñiga N,Ayarza E,López-Fenner J,Redi CA,Berríos S

doi

10.3390/genes10020120

subject

Has Abstract

pub_date

2019-02-06 00:00:00

issue

2

issn

2073-4425

pii

genes10020120

journal_volume

10

pub_type

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