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The Genetic Architecture of Congenital Diarrhea and Enteropathy (CODE)

ABSTRACT: The Genetic Architecture of Congenital Diarrhea and Enteropathy (CODE)

PROVIDER: PRJNA1102436 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR28747885_1.fastq.gz	Fastqsanger.gz
	SRR28747885_2.fastq.gz	Fastqsanger.gz
	SRR28747886_1.fastq.gz	Fastqsanger.gz
	SRR28747886_2.fastq.gz	Fastqsanger.gz
	SRR28747887_1.fastq.gz	Fastqsanger.gz

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The Genetic Architecture of Congenital Diarrhea and Enteropathy (CODE)

Project description:Next-generation sequencing (NGS) has supported precision therapeutic approaches that have improved the lives of children with rare diseases. Patients with congenital diarrhea and enteropathies (CODE) have a particularly difficult disease with high morbidity and mortality. However, there are now several targeted therapies including specific diets, pharmacological treatments, and surgical interventions that are based on an individual’s genetic diagnosis. We performed NGS on a large cohort of 139 infants with suspected monogenic congenital diarrheal disorders and identified known causal variants in 50% of cases, including a new founder NEUROG3 variant. We also uncovered and functionally characterized three novel CODE genes, GRWD1, MYO1A, and MON1A, using cell and zebrafish models.

2025-05-21 | GSE264461 | GEO

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Project description:Congenital diarrheas and enteropathies (CODEs) constitute a heterogeneous group of individually rare disorders manifesting with infantile-onset chronic diarrhea. Genomic deletions in chromosome 16, encompassing a sequence termed the 'intestine-critical region (ICR)', were recently identified as the cause of an autosomal recessive congenital enteropathy. The regulatory sequence within the ICR is flanked by an unannotated open reading frame termed PERCC1, which plays a role in enteroendocrine cell (EEC) function. We investigated two unrelated children with idiopathic congenital diarrhea requiring home parenteral nutrition attending the Irish Intestinal Failure Program. Currently 12 and 19-years old, these Irish male patients presented with watery diarrhea and hypernatremic dehydration in infancy. Probands were phenotyped by comprehensive clinical investigations, including endoscopic biopsies and serum gastrin level measurements. Following negative exome sequencing, PCR and Sanger sequencing of the entire coding region and intron boundaries of PERCC1 were performed for each proband and their parents. In both patients, serum gastrin levels were low and failed to increase following a meal challenge. While no deletions involving the ICR were detected, targeted sequencing of the PERCC1 gene revealed a shared homozygous c.390C > G stop gain variant. We report clinical and molecular findings in two unrelated patients harboring a shared homozygous variant in PERCC1, comprising the first description of a point mutation in this gene in association with CODE. That both parenteral nutrition dependent children with unexplained diarrhea at our institution harbored a PERCC1 mutation underscores the importance of its inclusion in exome sequencing interpretation.

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