Identification of the first homozygous 1-bp deletion in GDF9 gene leading to primary ovarian insufficiency by using targeted massively parallel sequencing

Author(s)

Franca, M. M. ^[1] ; Funari, M. F. A. ^[1] ; Nishi, M. Y. ^{[1, 2]} ; Narcizo, A. M. ^[2] ; Domenice, S. ^[1] ; Costa, E. M. F. ^[1] ; Lerario, A. M. ^{[3, 2]} ; Mendonca, B. B. ^{[1, 2]}

Affiliation

^[1] Univ Sao Paulo, Unidade Endocrinol Desenvolvimento, Lab Hormonios & Genet Mol LIM42, Hosp Clin, Disciplina Endocrinol, Fac Med, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Lab Sequenciamento Larga Escala SELA, Fac Med, Sao Paulo - Brazil

^[3] Univ Michigan, Dept Internal Med, Div Metab Endocrinol & Diabet, Ann Arbor, MI 48109 - USA

• Document type: Journal article
• Source: Clinical Genetics; v. 93, n. 2, p. 408-411, FEB 2018.
• Web of Science Citations: 7

Abstract

Targeted massively parallel sequencing (TMPS) has been used in genetic diagnosis for Mendelian disorders. In the past few years, the TMPS has identified new and already described genes associated with primary ovarian insufficiency (POI) phenotype. Here, we performed a targeted gene sequencing to find a genetic diagnosis in idiopathic cases of Brazilian POI cohort. A custom SureSelect(XT) DNA target enrichment panel was designed and the sequencing was performed on Illumina NextSeq sequencer. We identified 1 homozygous 1-bp deletion variant (c.783delC) in the GDF9 gene in 1 patient with POI. The variant was confirmed and segregated using Sanger sequencing. The c.783delC GDF9 variant changed an amino acid creating a premature termination codon (p.Ser262Hisfs{*}2). This variant was not present in all public databases (ExAC/gnomAD, NHLBI/EVS and 1000Genomes). Moreover, it was absent in 400 alleles from fertile Brazilian women screened by Sanger sequencing. The patient's mother and her unaffected sister carried the c.783delC variant in a heterozygous state, as expected for an autosomal recessive inheritance. Here, the TMPS identified the first homozygous 1-bp deletion variant in GDF9. This finding reveals a novel inheritance pattern of pathogenic variant in GDF9 associated with POI, thus improving the genetic diagnosis of this disorder. (AU)

• FAPESP's process: 13/02162-8 - Molecular pathogenesis and characterization of monogenic developmental diseases: a route to translational medicine
• Grantee: Berenice Bilharinho de Mendonça
• Support Opportunities: Research Projects - Thematic Grants