Abnormal sperm in mice lacking the Taf7l gene.

Area of Science:

• Molecular Biology
• Genetics
• Reproductive Biology

Background:

• Transcription factor TFIID regulates gene expression for most protein-coding genes.
• TAF7L is an X-linked paralogue of TAF7, a component of TFIID, specifically expressed in germ cells.

Purpose of the Study:

• To investigate the function of TAF7L in male germ cell differentiation and fertility.
• To generate and characterize Taf7l mutant mice to understand its role in spermatogenesis.

Main Methods:

• Generation of Taf7l mutant mice using homologous recombination and Cre-loxP strategy.
• Analysis of sperm count, morphology, and motility in mutant mice.
• Microarray profiling of gene expression in mutant testes.

Main Results:

• Taf7l mutant mice exhibited reduced testis weight, significantly decreased sperm count, and abnormal sperm morphology (e.g., folded tails).
• Sperm motility was significantly impaired, leading to reduced litter size in mutant males.
• Microarray analysis revealed a >2-fold decrease in specific gene transcripts, including Fscn1, in mutant testes.

Conclusions:

• TAF7L plays a specialized role in male germ cell differentiation, essential for normal sperm morphology and motility.
• While TAF7 may partially compensate for Taf7l deficiency, TAF7L has unique functions in gene regulation.
• Mutations in human TAF7L may be linked to X-linked oligozoospermia in men.