Whole Exome-Trio Analysis Reveals Rare Variants Associated with Congenital Pouch Colon

Area of Science:

• Genetics
• Developmental Biology
• Pediatric Surgery

Background:

• Anorectal malformations (ARM) are common birth defects.
• Congenital Pouch Colon (CPC) is a rare, severe ARM characterized by a dilated colon pouch and genitourinary tract communication.
• Understanding the genetic basis of CPC is crucial for improved diagnosis and treatment.

Purpose of the Study:

• To identify de novo heterozygous missense variants associated with Congenital Pouch Colon (CPC).
• To discover variants of unknown significance (VUS) that may offer insights into CPC pathogenesis.
• To explore the potential role of rare allelic variation in CPC manifestation.

Main Methods:

• Whole exome sequencing (WES) was performed on 16 affected neonates and their parents/unaffected siblings (16 trios).
• Proband exomes were compared with unaffected family members to identify de novo and rare variants.
• RNA-sequencing (RNA-Seq) was conducted as a pilot study to assess differential gene expression.

Main Results:

• Extremely rare variants in TAF1B, MUC5B, and FRG1 were identified in association with CPC.
• These variants were further validated as potentially disease-causing mutations for CPC.
• Pilot RNA-Seq data suggested potential differential expression of genes harboring these mutations.

Conclusions:

• Rare variants in TAF1B, MUC5B, and FRG1 are implicated in the pathogenesis of Congenital Pouch Colon.
• These findings contribute to understanding the genetic underpinnings of CPC.
• The identified variants may pave the way for novel therapeutic strategies and interventions for CPC, potentially reducing the need for complex surgical procedures.