Beat frequency is bimodally distributed in spermatozoa from T/t12 mice

Area of Science:

• Reproductive biology
• Sperm motility analysis
• Genetics and epigenetics

Background:

• Sperm flagellar beat frequency is crucial for male fertility.
• Genetic variations can influence sperm function and motility.
• T-complex mutations are known to affect male reproductive traits in mice.

Purpose of the Study:

• To investigate the impact of varying mouse genotypes on sperm flagellar beat frequency.
• To compare flagellar beat frequency patterns between standard inbred/outbred lines and T-complex stocks.
• To explore potential subpopulations of spermatozoa within specific T-complex genotypes.

Main Methods:

• High-speed cinemicrography was employed to record and analyze sperm flagellar movement.
• Spermatozoa from different mouse genotypes (inbred, F1, outbred, T-complex stocks T/t6, T/t12) were analyzed.
• Flagellar beat frequencies were quantified and distributions analyzed over time.

Main Results:

• Flagellar beat frequency exhibited unimodal distributions in standard inbred, F1, and outbred mouse lines.
• Spermatozoa from T-complex balanced lethal stocks (T/t6, T/t12) showed reduced variation in beat frequency.
• A bimodal distribution of beat frequency was observed in T/t12 spermatozoa two hours post-collection.

Conclusions:

• Mouse genotype significantly influences sperm flagellar beat frequency.
• T-complex mutations are associated with altered sperm motility patterns, potentially reducing variability.
• The bimodal distribution in T/t12 suggests the presence of distinct spermatozoa subpopulations affecting motility.