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New biallelic mutations in PADI6 cause recurrent preimplantation embryonic arrest characterized by direct cleavage.

J Assist Reprod Genet. 2020 Jan;37(1):205-212. Epub 2019 Oct 29
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摘要


PURPOSE:To investigate the pathogenesis of the recurrent preimplantation embryonic arrest characterized by direct cleavage. METHODS:Two affected individuals underwent time-lapse imaging to observe the cleavage behaviors in their final ICSI attempts. In addition, both patients were subjected to whole-exome sequencing. After the identification of possible causative genes, molecular modeling analyses were used to evaluate the possible effects of candidate mutations on protein secondary structure. RESULTS:All the bipronucleated (2PN) zygotes from both individuals presented multiple abnormal cleavage behaviors, particularly direct cleavage (DC) and subsequent cleavage arrest. Mutation analysis identified one new frameshift mutation c.1521dupC (p.S508Qfs*5) and two missense mutations c.A1117C and c.C1708T (p.T373P and p.R570C, respectively) of the gene, which were in the protein-arginine deiminase domain and highly conserved. CONCLUSION:This study expands the mutation spectrum of duanyu1563I6 and is the first to propose that the preimplantation embryonic arrest with concomitant abnormal cleavage behaviors, especially DC, maybe associated with duanyu1563I6 mutations.

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