Four Novel NR5A1 Mutations in 46,XY Gonadal Dysgenesis Patients Including Frameshift Mutations with Altered...

Area of Science:

• Genetics
• Endocrinology
• Developmental Biology

Background:

• 46,XY gonadal dysgenesis (46,XY GD) is a complex disorder of sexual development.
• Mutations in SRY and NR5A1 (SF-1) are common causes, but the molecular basis is often unknown.
• NR5A1 (SF-1) plays a critical role in early gonad development and testis differentiation.

Purpose of the Study:

• To investigate NR5A1 (SF-1) gene mutations in patients with 46,XY GD.
• To identify novel mutations and assess their functional impact.
• To elucidate the molecular mechanisms underlying 46,XY GD.

Main Methods:

• Retrospective analysis of NR5A1 (SF-1) gene sequences in 84 patients with 46,XY GD.
• Identification and characterization of heterozygous mutations.
• In vitro transfection studies to evaluate subcellular localization and protein function of mutant SF-1.

Main Results:

• Seven heterozygous NR5A1 (SF-1) mutations were identified in 6 out of 84 patients (7.1%).
• Four novel mutations (c.268G>T, c.369del, c.871-1G>C, c.893T>C) were discovered.
• Frameshift mutations led to altered subcellular localization of SF-1 protein, suggesting impaired function.

Conclusions:

• Novel NR5A1 (SF-1) mutations are associated with 46,XY gonadal dysgenesis.
• In vitro data suggest these mutations impair SF-1 protein function.
• Further research into NR5A1 (SF-1) mutations is crucial for understanding 46,XY GD pathogenesis.