Uterine dysfunction and genetic modifiers in centromere protein B-deficient mice

Area of Science:

• Genetics and Molecular Biology
• Reproductive Biology
• Mammalian Development

Background:

• Centromere protein B (CENP-B) is a conserved protein essential for centromere function.
• Previous studies indicated CENP-B null mice are largely normal, with only minor weight reductions.

Purpose of the Study:

• To investigate the phenotypic consequences of Cenpb gene disruption in mice.
• To determine the role of CENP-B in reproductive organ development and function.

Main Methods:

• Generation and analysis of Cenpb null mice across three different genetic backgrounds (R1, W9.5, C57).
• Assessment of body weight, reproductive organ weights (testis, uterus), and reproductive performance.
• Histological examination of uterine tissues and in situ hybridization to determine CENP-B expression patterns.

Main Results:

• Cenpb null male mice exhibited reduced testis weight across all genetic backgrounds.
• Female Cenpb null mice showed significant uterine weight reduction, with varying severity depending on genetic background.
• Reproductive competence in null females declined with age, particularly on the C57 background, with uterine epithelium abnormalities observed.
• Revertant mice confirmed the observed phenotypes were due to Cenpb gene disruption.

Conclusions:

• Cenpb gene disruption results in significant reproductive organ weight reduction and impaired female reproductive function.
• CENP-B plays a crucial role in uterine morphogenesis and function, with potential implications for human reproductive pathology.
• Genetic background significantly influences the phenotypic expression of Cenpb deficiency.