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Genetic issues in ICP.

Julia Zöllner1, Catherine Williamson2, Peter H Dixon2

  • 1University College London, London, UK.

Obstetric Medicine
|September 12, 2024
PubMed
Summary

Genetic factors significantly influence intrahepatic cholestasis of pregnancy (ICP), a common liver disorder. Understanding these genetic variations, including ABCB4 and ABCB11, aids in risk assessment and personalized treatment strategies for better outcomes.

Keywords:
Intrahepatic cholestasis of pregnancygeneticsgenomicspregnancy complications

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Area of Science:

  • Hepatology
  • Genetics
  • Obstetrics

Background:

  • Intrahepatic cholestasis of pregnancy (ICP) is a prevalent gestational liver disorder with diverse global incidence.
  • Its etiology involves a complex interplay of genetic susceptibility, hormonal fluctuations, and environmental factors.
  • Elevated serum bile acids in ICP are linked to adverse pregnancy outcomes, underscoring the need for thorough risk assessment.

Purpose of the Study:

  • To explore the role of genetic variations in the susceptibility and manifestation of intrahepatic cholestasis of pregnancy (ICP).
  • To highlight the significance of specific gene variants, such as ABCB4 and ABCB11, in severe ICP cases.
  • To discuss the potential of genetic insights for personalized management and precision medicine in ICP.

Main Methods:

  • Review and synthesis of existing literature on genetic factors implicated in ICP.
  • Analysis of the contribution of specific gene variants (e.g., ABCB4, ABCB11, ATP8B1) to ICP aetiology.
  • Examination of the association between genetic variations and other liver-related conditions.

Main Results:

  • ABCB4 and ABCB11 gene variants are significant contributors in approximately 20% of severe ICP cases.
  • Multiple other genes, including ATP8B1, NR1H4, ABCC2, TJP2, SERPINA1, GCKR, and HNF4A, are associated with ICP.
  • ABCB4 variants also increase the risk for drug-induced intrahepatic cholestasis, gallstones, and certain cancers.

Conclusions:

  • Genetic variations, encompassing both rare and common types, play a crucial role in ICP susceptibility.
  • Harnessing genetic knowledge offers a promising avenue for developing personalized management and intervention strategies for ICP.
  • Further research is essential to fully understand variant-specific phenotypic expressions and their therapeutic implications in advancing precision medicine for ICP.