Abstract
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 PADI6 gene, which were in the protein-arginine deiminase (PAD) domain and highly conserved.
Conclusion
This study expands the mutation spectrum of PADI6 and is the first to propose that the preimplantation embryonic arrest with concomitant abnormal cleavage behaviors, especially DC, maybe associated with PADI6 mutations.
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Acknowledgments
We thank all families that participated in our study.
Funding
This study is supported by grants from National Key R&D Program of China (grant 2018YFC1003100, to L.H.) and Natural Science Foundation of Hunan Province (2018JJ3893).
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This study was approved by the Ethics Committee of the Reproductive and Genetic Hospital of CITIC-Xiangya (reference LL-SC-2017-009).
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Zheng, W., Chen, L., Dai, J. et al. New biallelic mutations in PADI6 cause recurrent preimplantation embryonic arrest characterized by direct cleavage. J Assist Reprod Genet 37, 205–212 (2020). https://doi.org/10.1007/s10815-019-01606-7
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DOI: https://doi.org/10.1007/s10815-019-01606-7