Journal
ZYGOTE
Volume 21, Issue 2, Pages 129-138Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0967199411000694
Keywords
ART; Development; Human blastocysts; Imprinting; KCNQ1OT1
Funding
- Organon
- Universite Claude Bernard Lyon I
- Fondation pour la Recherche Medicale fellowship
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To evaluate the integrity of genomic imprinting in embryos that failed to develop normally following intracytoplasmic sperm injection (ICSI), we analysed the methylation profile of H19 and KCNQ1OT1 imprinting control regions, H19DMR and KvDMR1 respectively, in high-grade blastocysts and in embryos that exhibited developmental anomalies. Significant hypomethylation of KvDMR1 was specifically observed in 5/5 atypical blastocysts graded BC, which probably reflected the vulnerability of the imprint in the inner cell mass during the methylation remodelling phase in the early embryo. In addition, KvDMR1 was hypermethylated in 2/5 CC graded atypical blastocysts and in 2/8 embryos that exhibited developmental delay. H19DMR appeared differentially methylated in all groups of embryos. DNA methyltransfersase 1 (DNMT1) expression was similar in most of the tested embryos and could not account for the abnormal methylation patterns of KvDMR1 observed.
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