Genes, Vol. 12, Pages 1137: Meiotic Silencing in Pigs: A Case Study in a Translocated Azoospermic Boar

Genes, Vol. 12, Pages 1137: Meiotic Silencing in Pigs: A Case Study in a Translocated Azoospermic Boar Genes doi: 10.3390/genes12081137 Authors: Nicolas Mary Anne Calgaro Harmonie Barasc Nathalie Bonnet Stéphane Ferchaud Isabelle Raymond-Letron Alain Ducos Alain Pinton Carriers of balanced constitutional reciprocal translocations usually present a normal phenotype, but often show reproductive disorders. For the first time in pigs, we analyzed the meiotic process of an autosome–autosome translocation associated with azoospermia. Meiotic process analysis revealed the presence of unpaired autosomal segments with histone γH2AX accumulation sometimes associated with the XY body. Additionally, γH2AX signals were observed on apparently synapsed autosomes other than the SSC1 or SSC15, as previously observed in Ataxia with oculomotor apraxia type 2 patients or knock-out mice for the Senataxin gene. Gene expression showed a downregulation of genes selected on chromosomes 1 and 15, but no upregulation of SSCX genes. We hypothesized that the total meiotic arrest observed in this boar might be due to the silencing of crucial autosomal genes by the mechanism referred to as meiotic silencing of unsynapsed chromatin (MSUC).
Source: Genes - Category: Genetics & Stem Cells Authors: Tags: Article Source Type: research