TP63-truncating variants cause isolated premature ovarian insufficiency

Area of Science:

• Genetics
• Reproductive Endocrinology
• Molecular Biology

Background:

• Premature ovarian insufficiency (POI) is characterized by amenorrhea and elevated follicle-stimulating hormone levels before age 40.
• The genetic underpinnings of POI, particularly isolated forms, remain largely uncharacterized.
• Previous research suggested a potential role for TP63 in ovarian function, but its association with isolated POI was not established.

Purpose of the Study:

• To investigate the genetic basis of premature ovarian insufficiency (POI) in a cohort of affected patients.
• To identify novel causative genes and variants associated with both syndromic and isolated POI.
• To elucidate the genotype-phenotype correlations for identified genetic variants, particularly in TP63.

Main Methods:

• Whole-exome sequencing was performed on 13 patients diagnosed with premature ovarian insufficiency (POI).
• Bioinformatic analysis was used to identify causative variants in known and potential novel POI genes.
• Phenotypic data of patients carrying identified variants were correlated with genetic findings.

Main Results:

• Causative variants in PREPL and TP63 genes were identified in the studied POI patients.
• PREPL deficiency was consistent with a known cause of syndromic POI.
• Nonsense variants in the terminal exon of TP63 were found in patients with isolated POI, suggesting a novel role in ovarian biology and expanding the phenotypic spectrum of TP63-related disorders.

Conclusions:

• This study identifies novel genetic causes for premature ovarian insufficiency (POI), including variants in PREPL and TP63.
• The findings establish a new genotype-phenotype correlation for TP63, linking specific variants to isolated POI.
• The research contributes to a better understanding of the genetic etiology of POI and expands the spectrum of TP63-related conditions.