Abstract
Germline mutations of the tumor suppressor gene LKB1/STK11 are responsible for the Peutz–Jeghers syndrome (PJS), an autosomal-dominant disorder characterized by mucocutaneous pigmentation, hamartomatous polyps, and an increased risk of associated malignancies. In this study, we assessed the presence of pathogenic mutations in the LKB1/STK11 gene in 46 unrelated PJS families, and also carried genotype–phenotype correlation in regard of the development of cancer in 170 PJS patients belonging to these families. All LKB1/STK11 variants detected with single-strand conformational polymorphism were confirmed by direct sequencing, and those without LKB1/STK11 mutation were further submitted to Southern blot analysis for detection of deletions/rearrangements. Statistical analysis for genotype–phenotype correlation was performed. In 59% (27/46) of unrelated PJS cases, pathogenic mutations in the LKB1/STK11 gene, including 9 novel mutations, were identified. The new mutations were 2 splice site deletion–insertions, 2 missenses, 1 nonsense, and 4 abnormal splice sites. Genotype–phenotype analysis did not yield any significant differences between patients carrying mutations in LKB1/STK11 versus those without mutations, even with respect to primary biliary adenocarcinoma. This study presents the molecular characterization and cancer occurrence of a large cohort of PJS patients, increases the mutational spectrum of LKB1/STK11 allelic variants worldwide, and provides a new insight useful for clinical diagnosis and genetic counseling of PJS families.
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Acknowledgments
The authors thank all the members of the PJS families for their collaboration. We thank Pooya Daemi (University of Esfahan, Iran) and Marc Martinez Llordella (University of Geneva, Switzerland) for their help in the collection of blood samples. We are deeply indebted to Pr Daniel Burdick for the valuable collaboration (Department of Surgery, Syracuse, New York). We also express our gratitude to Angela Quagliarella (Università di Bari, Italy) for technical assistance. We thank Dr M. Tinguely (Department of Clinical Pathology, Geneva Cantonal Hospital, Switzerland) for laser capture dissection of the samples. This study was supported by the Ligue Suisse, Ligue Genevoise contre le Cancer, and MIUR-FIRB grant RBAUO1SZHB_001 (G.G).
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Mehenni, H., Resta, N., Guanti, G. et al. Molecular and Clinical Characteristics in 46 Families Affected with Peutz–Jeghers Syndrome. Dig Dis Sci 52, 1924–1933 (2007). https://doi.org/10.1007/s10620-006-9435-3
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DOI: https://doi.org/10.1007/s10620-006-9435-3