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ATP8B1 mutations in British cases with intrahepatic cholestasis of pregnancy

R Müllenbach1, A Bennett, N Tetlow

  • 1Maternal and Fetal Disease Group, 3rd Floor IRDB, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK.

Gut
|May 13, 2005
PubMed

Insights

Mutations in the ATP8B1 gene are linked to intrahepatic cholestasis of pregnancy (ICP). Magnetic resonance spectroscopy (MRS) suggests altered biliary phospholipids in ICP, offering a potential non-invasive assessment tool.

Area of Science:

  • Genetics
  • Hepatology
  • Obstetrics

Background:

  • Intrahepatic cholestasis of pregnancy (ICP) is a pregnancy complication affecting 0.7% of UK pregnancies, linked to adverse fetal outcomes.
  • Homozygous ATP8B1 gene mutations cause specific cholestasis forms (PFIC1, BRIC) with normal gamma-GT.
  • Investigating ATP8B1 mutations in ICP is crucial due to its association with fetal risks.

Purpose of the Study:

  • To determine if ATP8B1 gene mutations are associated with ICP in British patients.
  • To explore the potential role of ATP8B1 in the pathogenesis of ICP.
  • To assess the utility of magnetic resonance spectroscopy (MRS) in evaluating liver and biliary constituents in ICP.

Main Methods:

  • Sequence analysis of ATP8B1 coding exons in 16 ICP patients.
  • Examination of 182 ICP patients and 120 controls for identified ATP8B1 variants.
  • In vivo hepatic (31)P magnetic resonance spectroscopy (MRS) in eight ICP cases, including two with mutations.

Main Results:

  • Two heterozygous ATP8B1 mutations (208G>A and 2599C>T) were identified in ICP cases.
  • The 208G>A mutation was found in three ICP patients.
  • MRS revealed significantly increased phosphodiester signals (p=0.03) and decreased phosphomonoester/phosphodiester ratios (p=0.04) in ICP patients compared to controls.

Conclusions:

  • ATP8B1 mutations are demonstrated in intrahepatic cholestasis of pregnancy (ICP).
  • MRS findings suggest a link between ICP susceptibility and elevated biliary phospholipids.
  • MRS shows promise as a non-invasive method for assessing liver and biliary components in cholestatic conditions.
Abstract

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