Tendency towards clonality: deviations of meiosis in parthenogenetic Caucasian rock lizards DOI Creative Commons
Victor Spangenberg, Marine Arakelyan, Sergey A. Simanovsky

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 8, 2024

Abstract Cytogenetic mechanisms of unisexuality in diploid parthenogenetic species genusDarevskiaremained debatable until recently. The mechanism that allows the unisexual form to maintain its heterozygosity a number generations is important for long-term existence nature. In this work, first time genus Darevskia, addition primary oocytes with usual ploidy (18 + ZW bivalents meiotic prophase I) underwent premeiotic genome endoduplication and carry doubled (36 ZZ WW) were found. Here we present detailed comparative analysis total preparation synaptonemal complexes oocyte nuclei without endoduplication, behavior sex Z W chromosomes. We show details assembly pachytene nuclei, where either homeologues or identical copies chromosomes compete synapsis multivalents. For time, WW pseudobivalent has been visualized reptiles. reverse side deviations obligate parthenogenesis - cases non-viable embryos specific abnormalities.

Language: Английский

Speciation by hybridization: the mind-boggling nature, educational, and research value of the largest group of unisexual vertebrates DOI Creative Commons
Anthony J. Barley,

Charles J. Cole

BioScience, Journal Year: 2025, Volume and Issue: 75(4), P. 331 - 341

Published: Jan. 17, 2025

Abstract Thirteen species of North American lizards are remarkable because only females exist, which reproduce by cloning unfertilized eggs. Their closest relatives sexually, with eggs fertilized sperm from males, as in most vertebrates. The unisexual originated through hybridization, dispensing sex and males a single generation. These hold tremendous potential science education fascinating model for learning about fundamental biological concepts, research developing knowledge medical applications reproductive biology, embryonic development, genetic interactions. maintain genome integrity hybrid state recombination is absent, but do not suffer conditions or disorders such Down's Syndrome cancer that caused aneuploidy humans. multifarious impacts hybridization on the diversity this group present an exceptional opportunity to deepen understanding complicated process evolutionary diversification.

Language: Английский

Citations

0
Tendency towards clonality: deviations of meiosis in parthenogenetic Caucasian rock lizards DOI Creative Commons
Victor Spangenberg, Marine Arakelyan, Sergey A. Simanovsky

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 13, 2024

Abstract Cytogenetic mechanisms of unisexuality in diploid parthenogenetic species the genusDarevskiahaveremained debatable until recently. The mechanism that allows unisexual form to maintain heterozygosity a number generations is important for its long-term existence nature. In this work, first time, genus Darevskia, addition primary oocytes with usual ploidy (18+ZW bivalents meiotic prophase I), underwent premeiotic genome endoduplication and carried doubled (36+ZZ+WW) were found. Here, we present detailed comparative analysis total preparation synaptonemal complexes oocyte nuclei without behavior sex Z W chromosomes. We show details assembly pachytene nuclei, where either homeologs or identical copies chromosomes compete synapsis multivalents. For WW pseudobivalent has been visualized reptiles. reverse side deviations obligate parthenogenesis — cases nonviable embryos specific abnormalities.

Language: Английский

Citations

3
Tendency towards clonality: deviations of meiosis in parthenogenetic Caucasian rock lizards DOI Creative Commons
Victor Spangenberg, Marine Arakelyan, Sergey A. Simanovsky

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 8, 2024

Abstract Cytogenetic mechanisms of unisexuality in diploid parthenogenetic species genusDarevskiaremained debatable until recently. The mechanism that allows the unisexual form to maintain its heterozygosity a number generations is important for long-term existence nature. In this work, first time genus Darevskia, addition primary oocytes with usual ploidy (18 + ZW bivalents meiotic prophase I) underwent premeiotic genome endoduplication and carry doubled (36 ZZ WW) were found. Here we present detailed comparative analysis total preparation synaptonemal complexes oocyte nuclei without endoduplication, behavior sex Z W chromosomes. We show details assembly pachytene nuclei, where either homeologues or identical copies chromosomes compete synapsis multivalents. For time, WW pseudobivalent has been visualized reptiles. reverse side deviations obligate parthenogenesis - cases non-viable embryos specific abnormalities.

Language: Английский

Citations

0