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Diagnostic value of exome and whole genome sequencing in craniosynostosis

ABSTRACT: Diagnostic value of exome and whole genome sequencing in craniosynostosis

PROVIDER: PRJEB17650 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR1742670.fastq.gz	Fastqsanger.gz
	ERR1742670_1.fastq.gz	Fastqsanger.gz
	ERR1742670_2.fastq.gz	Fastqsanger.gz
	ERR1742671.fastq.gz	Fastqsanger.gz
	ERR1742671_1.fastq.gz	Fastqsanger.gz

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Diagnostic value of exome and whole genome sequencing in craniosynostosis.

Project description:BackgroundCraniosynostosis, the premature fusion of one or more cranial sutures, occurs in ∼1 in 2250 births, either in isolation or as part of a syndrome. Mutations in at least 57 genes have been associated with craniosynostosis, but only a minority of these are included in routine laboratory genetic testing.MethodsWe used exome or whole genome sequencing to seek a genetic cause in a cohort of 40 subjects with craniosynostosis, selected by clinical or molecular geneticists as being high-priority cases, and in whom prior clinically driven genetic testing had been negative.ResultsWe identified likely associated mutations in 15 patients (37.5%), involving 14 different genes. All genes were mutated in single families, except for IL11RA (two families). We classified the other positive diagnoses as follows: commonly mutated craniosynostosis genes with atypical presentation (EFNB1, TWIST1); other core craniosynostosis genes (CDC45, MSX2, ZIC1); genes for which mutations are only rarely associated with craniosynostosis (FBN1, HUWE1, KRAS, STAT3); and known disease genes for which a causal relationship with craniosynostosis is currently unknown (AHDC1, NTRK2). In two further families, likely novel disease genes are currently undergoing functional validation. In 5 of the 15 positive cases, the (previously unanticipated) molecular diagnosis had immediate, actionable consequences for either genetic or medical management (mutations in EFNB1, FBN1, KRAS, NTRK2, STAT3).ConclusionsThis substantial genetic heterogeneity, and the multiple actionable mutations identified, emphasises the benefits of exome/whole genome sequencing to identify causal mutations in craniosynostosis cases for which routine clinical testing has yielded negative results.

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