Biliary atresia: A comprehensive review

Area of Science:

• Pediatric Gastroenterology
• Hepatology
• Neonatal Medicine

Background:

• Biliary atresia is an obliterative cholangiopathy causing neonatal jaundice and pale stools.
• The etiology is heterogeneous, with both developmental and environmental factors implicated.
• Specific clinical variants, such as syndromic biliary atresia (BASM), cystic form, and CMV IgM-associated cases, offer clearer etiological insights.

Purpose of the Study:

• To review the clinical evidence for developmental or immune-mediated etiologies of biliary atresia.
• To explore recently suggested etiological concepts including microchimerism, gene susceptibility, and environmental toxins.
• To synthesize current understanding of biliary atresia's diverse causes.

Main Methods:

• Literature review of clinical evidence.
• Analysis of proposed etiological factors.
• Synthesis of findings on developmental, immune-mediated, and environmental influences.

Main Results:

• Clinical variants provide better etiological matches, though causes remain speculative for most cases.
• Evidence supports developmental or immune-mediated origins, potentially triggered by perinatal viral exposure.
• Emerging concepts like microchimerism, genetic susceptibility, and environmental toxins are under investigation.

Conclusions:

• Biliary atresia etiology is complex and multifactorial.
• Further research into viral, genetic, and environmental factors is crucial.
• Understanding diverse etiologies may lead to improved diagnostics and therapeutics for biliary atresia.