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Homozygous Mutations in WEE2 Cause Fertilization Failure and Female Infertility.

Abstract：

:Fertilization is a fundamental process of development and is a prerequisite for successful human reproduction. In mice, although several receptor proteins have been shown to play important roles in the process of fertilization, only three genes have been shown to cause fertilization failure and infertility when deleted in vivo. In clinical practice, some infertility case subjects suffer from recurrent failure of in vitro fertilization and intracytoplasmic sperm injection attempts due to fertilization failure, but the genetic basis of fertilization failure in humans remains largely unknown. Wee2 is a key oocyte-specific kinase involved in the control of meiotic arrest in mice, but WEE2 has not been associated with any diseases in humans. In this study, we identified homozygous mutations in WEE2 that are responsible for fertilization failure in humans. All four independent affected individuals had homozygous loss-of-function missense mutations or homozygous frameshift protein-truncating mutations, and the phenotype of fertilization failure was shown to follow a Mendelian recessive inheritance pattern. All four mutations significantly decreased the amount of WEE2 protein in vitro and in affected individuals' oocytes in vivo, and they all led to abnormal serine phosphorylation of WEE2 and reduced tyrosine 15 phosphorylation of Cdc2 in vitro. In addition, injection of WEE2 cRNA into affected individuals' oocytes rescued the fertilization failure phenotype and led to the formation of blastocysts in vitro. This work presents a novel gene responsible for human fertilization failure and has implications for future therapeutic treatments for infertility cases.

journal_name

Am J Hum Genet

journal_title

American journal of human genetics

authors

Sang Q,Li B,Kuang Y,Wang X,Zhang Z,Chen B,Wu L,Lyu Q,Fu Y,Yan Z,Mao X,Xu Y,Mu J,Li Q,Jin L,He L,Wang L

doi

10.1016/j.ajhg.2018.02.015

subject

Has Abstract

pub_date

2018-04-05 00:00:00

pages

649-657

issue

4

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(18)30060-0

journal_volume

102

pub_type

杂志文章

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