Mutations in Genes Coding for Synaptonemal Complex Proteins and Their Impact on Human Fertility

Area of Science:

• Reproductive biology
• Genetics
• Cell biology

Background:

• Idiopathic infertility affects many males and females, with meiotic errors potentially playing a role.
• The synaptonemal complex (SC) is a crucial protein scaffold for successful meiosis.
• Understanding SC component mutations is vital for diagnosing infertility.

Purpose of the Study:

• To investigate the extent to which alterations in SC components are linked to human infertility.
• To analyze reported mutations in SC genes within infertile patient populations.
• To compare findings between males and females, and between humans and mice.

Main Methods:

• Review and analysis of documented mutations in SYCP3 and SYCE1 genes in infertile patients.
• Comparison of mutation types (heterozygous, homozygous) and their inheritance patterns.
• Integration of data from human studies with findings from knockout mouse models.

Main Results:

• Mutations in SYCP3 and SYCE1 genes have been identified in infertile individuals.
• SYCP3 mutations are often heterozygous with dominant-negative effects, while SYCE1 mutations are homozygous, indicating recessive inheritance.
• Similarities and differences in SC gene mutation effects were observed between sexes and species.

Conclusions:

• A small percentage of human infertility cases may be attributable to mutations in SC component genes.
• Characterizing these mutations enhances understanding of the molecular basis of idiopathic infertility.
• Further research, including comparative studies with animal models, is warranted.