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[Clinical characteristics and mutation analysis of the LKB1 gene in a Peutz-Jeghers syndrome pedigree]

Jian Pan1, Mei Li, Yu Jin

  • 1Department of Gastroenterology, Nanjing Children's Hospital Affiliated to Nanjing Medical University, China.

Zhonghua Er Ke Za Zhi = Chinese Journal of Pediatrics
|March 27, 2013
PubMed

Insights

Peutz-Jeghers syndrome (PJS) is linked to LKB1 gene mutations. A specific LKB1 mutation (c.924G>C) was identified in a PJS family, impacting protein function and aiding diagnosis.

Area of Science:

  • Genetics
  • Molecular Biology
  • Clinical Medicine

Background:

  • Peutz-Jeghers syndrome (PJS) is an autosomal dominant disorder.
  • PJS is characterized by mucocutaneous pigmentation, gastrointestinal polyps, and a hereditary pattern.
  • The LKB1 gene is implicated in PJS pathogenesis.

Purpose of the Study:

  • To investigate the clinical features of a Peutz-Jeghers syndrome pedigree.
  • To identify mutations in the LKB1 gene within this PJS family.
  • To analyze the functional impact of identified LKB1 gene mutations.

Main Methods:

  • Clinical data from a PJS family were collected and analyzed.
  • LKB1 gene mutation screening was performed using multiplex ligation-dependent probe amplification (MLPA) and DNA sequencing.
  • Protein structure and function alterations were predicted using SWISS-MODEL software.

Main Results:

  • The proband presented with characteristic mucocutaneous pigmentation and gastrointestinal hamartomatous polyps.
  • No LKB1 gene fragment deletions were detected by MLPA.
  • A germline mutation, c.924G>C in the LKB1 gene (resulting in Trp308Cys), was identified in affected family members but not in 250 healthy controls.
  • This mutation is predicted to reduce LKB1 protein activity due to conformational changes.

Conclusions:

  • Germline mutation screening of the LKB1 gene is crucial for diagnosing PJS.
  • Identifying LKB1 mutations in PJS patients and relatives can lead to definitive diagnoses.
  • Early diagnosis and genetic screening can improve patient outcomes and lifespan.
Abstract

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