Male Horse Meiosis: Metaphase I Chromosome Configuration and Chiasmata Distribution

Al-Jaru, Ayman, Goodwin, William H orcid iconORCID: 0000-0002-3632-3552, Skidmore, Julian, Raudsepp, Terje and Khazanehdari, Kamal (2014) Male Horse Meiosis: Metaphase I Chromosome Configuration and Chiasmata Distribution. Cytogenetic and Genome Research, 143 (4). ISSN 1424-8581

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Chromosome configurations and chiasma frequency during the metaphase I stage of spermatogenesis in the male horse are characterized in this work. The genome-wide frequency and distribution of chiasmata was detected as 49.45 ± 2.07 for 14 fertile stallions. All X and Y chromosomes shared a single chiasma at their pseudoautosomal region, while 1-4 chiasmata were observed in autosomal chromosomes. The chiasma frequency and distribution were further studied for 8 different bivalents identified by FISH in 5 fertile stallions. Genetic length was calculated from chiasmata data for the whole genome as well as for these 8 chromosomes. The findings complement the genetic linkage data and provide insight into the genetic basis of spermatogenesis in normal stallions

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