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Chromosome-level echidna genome illuminates evolution of multiple sex chromosome system in monotremes.
Gigascience
January 2025
Centre for Evolutionary & Organismal Biology, Zhejiang University School of Medicine, Hangzhou 310058, China.
Background: A thorough analysis of genome evolution is fundamental for biodiversity understanding. The iconic monotremes (platypus and echidna) feature extraordinary biology. However, they also exhibit rearrangements in several chromosomes, especially in the sex chromosome chain.
View Article and Find Full Text PDFBoth 20S and 19S proteasome components are essential for meiosis in male mice.
Zool Res
January 2025
Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong 510623, China. E-mail:
The proteasome, an evolutionarily conserved proteolytic complex comprising the 20S core particle and 19S regulatory particles, performs both shared and distinct functions across various tissues and organs. Spermatogenesis, a highly complex developmental process, relies on proteasome activity at multiple stages to regulate protein turnover. In this study, we selected the 20S subunit PSMA1 and 19S regulatory subunit PSMD2 to investigate the potential functions of the proteasome in spermatogenesis.
View Article and Find Full Text PDFThe Loss of Tafazzin Transacetylase Activity Is Sufficient to Drive Testicular Infertility.
J Dev Biol
November 2024
Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
Barth syndrome (BTHS) is a rare, infantile-onset, X-linked mitochondriopathy exhibiting a variable presentation of failure to thrive, growth insufficiency, skeletal myopathy, neutropenia, and heart anomalies due to mitochondrial dysfunction secondary to inherited TAFAZZIN transacetylase mutations. Although not reported in BTHS patients, male infertility is observed in several () mouse alleles and in a mutant. Herein, we examined the male infertility phenotype in a BTHS-patient-derived point-mutant knockin mouse () allele that expresses a mutant protein lacking transacetylase activity.
View Article and Find Full Text PDFPolyploids broadly generate novel haplotypes from trans-specific variation in Arabidopsis arenosa and Arabidopsis lyrata.
PLoS Genet
December 2024
Department of Botany, Faculty of Science, Charles University, Prague, Czech Republic.
Polyploidy, the result of whole genome duplication (WGD), is widespread across the tree of life and is often associated with speciation and adaptability. It is thought that adaptation in autopolyploids (within-species polyploids) may be facilitated by increased access to genetic variation. This variation may be sourced from gene flow with sister diploids and new access to other tetraploid lineages, as well as from increased mutational targets provided by doubled DNA content.
View Article and Find Full Text PDFHistone H3 tail modifications required for meiosis in .
bioRxiv
December 2024
Department of Genetics, Cell Biology & Development, University of Minnesota, Minneapolis, MN, USA.
Histone tail phosphorylation has diverse effects on a myriad of cellular processes, including cell division, and is highly conserved throughout eukaryotes. Histone H3 phosphorylation at threonine 3 (H3T3) during mitosis occurs at the inner centromeres and is required for proper biorientation of chromosomes on the mitotic spindle. While H3T3 is also phosphorylated during meiosis, a possible role for this modification has not been tested.
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