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• W2767346047 abstract "Genomic mosaicism in parental gametes and peripheral tissues is an important consideration for genetic counseling. We studied a Chinese cohort affected by a severe epileptic disorder, Dravet syndrome (DS). There were 56 fathers who donated semen and 15 parents who donated multiple peripheral tissue samples. We used an ultra-sensitive quantification method, micro-droplet digital PCR (mDDPCR), to detect parental mosaicism of the proband's pathogenic mutation in SCN1A, the causal gene of DS in 112 families. Ten of the 56 paternal sperm samples were found to exhibit mosaicism of the proband's mutations, with mutant allelic fractions (MAFs) ranging from 0.03% to 39.04%. MAFs in the mosaic fathers' sperm were significantly higher than those in their blood (p = 0.00098), even after conditional probability correction (p' = 0.033). In three mosaic fathers, ultra-low fractions of mosaicism (MAF < 1%) were detected in the sperm samples. In 44 of 45 cases, mosaicism was also observed in other parental peripheral tissues. Hierarchical clustering showed that MAFs measured in the paternal sperm, hair follicles and urine samples were clustered closest together. Milder epileptic phenotypes were more likely to be observed in mosaic parents (p = 3.006e-06). Our study provides new insights for genetic counseling." @default.
• W2767346047 created "2017-11-17" @default.
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• W2767346047 date "2017-11-15" @default.
• W2767346047 modified "2023-10-12" @default.
• W2767346047 title "Genomic mosaicism in paternal sperm and multiple parental tissues in a Dravet syndrome cohort" @default.
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• W2767346047 doi "https://doi.org/10.1038/s41598-017-15814-7" @default.
• W2767346047 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5688122" @default.
• W2767346047 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29142202" @default.
• W2767346047 hasPublicationYear "2017" @default.
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