A new mutation identified in SPATA16 in two globozoospermic patients

Area of Science:

• Genetics
• Reproductive Biology
• Human Molecular Genetics

Background:

• Globozoospermia is a rare infertility condition characterized by round-headed sperm.
• Previous studies have linked mutations in genes like DPY19L2 to globozoospermia.
• Identifying novel genetic causes is crucial for understanding male infertility.

Purpose of the Study:

• To identify potential genes involved in human globozoospermia.
• To investigate mutations in SPATA16 and PICK1 genes in patients with globozoospermia.
• To explore other candidate genes associated with globozoospermia.

Main Methods:

• Genetic screening of 19 globozoospermic patients for mutations in SPATA16 and PICK1.
• Candidate gene approach and Glutathione S-transferase (GST) pull-down assays to select additional genes.
• Mutation screening in four selected genes: GOPC, PICK1, AGFG1, and IRGC.

Main Results:

• A novel 22.6 Kb deletion in the SPATA16 gene was identified in two unrelated Tunisian patients.
• These patients shared identical deletion breakpoints and haplotype, suggesting a founder effect.
• No mutations were found in the coding sequences of AGFG1, GOPC, PICK1, and IRGC.

Conclusions:

• The study confirms the pathogenicity of SPATA16 mutations in globozoospermia.
• While AGFG1, GOPC, PICK1, and IRGC showed no variations in this cohort, they remain potential candidates.
• Larger patient cohorts are necessary to identify additional genes involved in globozoospermia.