A Recurrent ZP1 Variant is Responsible for Oocyte Maturation Defect with Degenerated Oocytes in Infertile Females

Overview

Journal Clin Genet

Specialty Genetics

Date 2022 Apr 23

PMID 35460069

Authors

Corinne Loeuillet

Magali Dhellemmes

Caroline Cazin

Zine-Eddine Kherraf

Selima Fourati Ben Mustapha

Raoudha Zouari

Nicolas Thierry-Mieg

Christophe Arnoult

Pierre F Ray

Affiliations

Soon will be listed here.

Abstract

A female factor is present in approximately 70% of couple infertility, often due to ovulatory disorders. In oocyte maturation defect (OMD), affected patients have a primary infertility with normal menstrual cycles but produce no oocyte, degenerated (atretic) or abnormal oocytes blocked at different stages of maturation. Four genes have so far been associated with OMD: PATL2, TUBB8, WEE2, and ZP1. In our initial study, 6 out of 23 OMD subjects were shown to carry the same PATL2 homozygous loss of function variant and one patient had a TUBB8 truncating variant. Here, we included four additional OMD patients and reanalyzed all 27 subjects. In addition to the seven patients with a previously identified defect, five carried the same deleterious homozygous ZP1 variant (c.1097G>A; p.Arg366Gln). All the oocytes from ZP1-associated patients appeared shriveled and dark indicating that the abnormal ZP1 protein induced oocyte death and degeneration. Overall ZP1-associated patients had degenerated or absent oocytes contrary to PATL2-associated subjects who had immature oocytes blocked mainly at the germinal vesicle stage. In this cohort of North African OMD patients, whole exome sequencing permitted to diagnose 44% of the patients studied and to identify a new frequent ZP1 variant.

Citing Articles

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A recurrent ZP1 variant is responsible for oocyte maturation defect with degenerated oocytes in infertile females.

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PMID: 35460069 PMC: 9327729. DOI: 10.1111/cge.14144.

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