Abdulmoein Eid Al-Agha1, Ihab Abdulhamed Ahmed1, Esther Nuebel2, Mika Moriwaki3, Barry Moore4, Katherine A Peacock3, Tim Mosbruger5, Deborah W Neklason6, Lynn B Jorde4, Mark Yandell4, Corrine K Welt3. 1. Pediatric Department, King Abdulaziz University Hospital, Jeddah, Saudi Arabia. 2. Howard Hughes Medical Institute and Department of Biochemistry, University of Utah, Salt Lake City, Utah. 3. Division of Endocrinology, Metabolism and Diabetes, University of Utah, Salt Lake City, Utah. 4. UStar Center for Genetic Discovery, Department of Human Genetics, University of Utah, Salt Lake City, Utah. 5. Bioinformatics, Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah. 6. Division of Genetic Epidemiology, Department of Internal Medicine, University of Utah, Salt Lake City, Utah.
Abstract
Context: The etiology of primary ovarian insufficiency (POI) remains unknown in most cases. Objective: We sought to identify the genes causing POI. Design: The study was a familial genetic study. Setting: The study was performed at two academic institutions. Patients: We identified a consanguineous Yemeni family in which four daughters had POI. A brother had azoospermia. Intervention: DNA was subjected to whole genome sequencing. Shared regions of homozygosity were identified using Truploidy and prioritized using the Variant Annotation, Analysis, and Search Tool with control data from 387 healthy subjects. Imaging and quantification of protein localization and mitochondrial function were examined in cell lines. Main Outcome: Homozygous recessive gene variants shared by the four sisters. Results: The sisters shared a homozygous stop gain mutation in exon 6 of PSMC3IP (c.489 C>G, p.Tyr163Ter) and a missense variant in exon 1 of CLPP (c.100C>T, p.Pro34Ser). The affected brother also carried the homozygous PSMC3IP mutation. Functional studies demonstrated mitochondrial fragmentation in cells infected with the CLPP mutation. However, no abnormality was found in mitochondrial targeting or respiration. Conclusions: The PSMC3IP mutation provides additional evidence that mutations in meiotic homologous recombination and DNA repair genes result in distinct female and male reproductive phenotypes, including delayed puberty and primary amenorrhea caused by POI (XX gonadal dysgenesis) in females but isolated azoospermia with normal pubertal development in males. The findings also suggest that the N-terminal missense mutation in CLPP does not cause substantial mitochondrial dysfunction or contribute to ovarian insufficiency in an oligogenic manner.
Context: The etiology of primary ovarian insufficiency (POI) remains unknown in most cases. Objective: We sought to identify the genes causing POI. Design: The study was a familial genetic study. Setting: The study was performed at two academic institutions. Patients: We identified a consanguineous Yemeni family in which four daughters had POI. A brother had azoospermia. Intervention: DNA was subjected to whole genome sequencing. Shared regions of homozygosity were identified using Truploidy and prioritized using the Variant Annotation, Analysis, and Search Tool with control data from 387 healthy subjects. Imaging and quantification of protein localization and mitochondrial function were examined in cell lines. Main Outcome: Homozygous recessive gene variants shared by the four sisters. Results: The sisters shared a homozygous stop gain mutation in exon 6 of PSMC3IP (c.489 C>G, p.Tyr163Ter) and a missense variant in exon 1 of CLPP (c.100C>T, p.Pro34Ser). The affected brother also carried the homozygous PSMC3IP mutation. Functional studies demonstrated mitochondrial fragmentation in cells infected with the CLPP mutation. However, no abnormality was found in mitochondrial targeting or respiration. Conclusions: The PSMC3IP mutation provides additional evidence that mutations in meiotic homologous recombination and DNA repair genes result in distinct female and male reproductive phenotypes, including delayed puberty and primary amenorrhea caused by POI (XX gonadal dysgenesis) in females but isolated azoospermia with normal pubertal development in males. The findings also suggest that the N-terminal missense mutation in CLPP does not cause substantial mitochondrial dysfunction or contribute to ovarian insufficiency in an oligogenic manner.
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