title: First report of somatic mosaicism for mutations in STK11 in four patients with Peutz-Jeghers syndrome.
abstract: Peutz-Jeghers syndrome (PJS) is an autosomal dominant cancer predisposition syndrome characterised by gastrointestinal polyposis and mucocutaneous pigmentation. Mutations in STK11, a serine-threonine protein kinase, have been associated with PJS in up to 100 % of published series. The hypothesis that a further genetic locus for PJS exists is controversial. No mutations in any other genes have been described in association with PJS. To date, no instances of somatic mosaicism for STK11 have been described. DNA extracted from peripheral lymphocytes and buccal cells was screened by sequence analysis for mutations in STK11. Dosage analysis was undertaken by multiplex ligation-dependent probe amplification (MLPA). Four patients have been shown to have mosaicism in STK11: two had mosaic deletions of specific exons (2-3 and 3-10) of the STK11 gene; one had a mosaic nonsense mutation in exon 5; and one had a mosaic frameshift mutation in exon 8. This report details the first four reported cases of somatic mosaicism for STK11 associated with PJS. This shows that techniques in addition to direct sequencing such as MLPA must be used to assess for large scale genomic deletions in patients meeting clinical diagnostic criteria for PJS. This also adds further weight to the hypothesis of a single genetic locus for PJS.
authors.affiliation: Department of Clinical Genetics, Merseyside and Cheshire Regional Clinical Genetics Service, Liverpool Women's NHS Foundation Trust, Crown Street, Liverpool, L8 7SS, UK. Victoria.mckay@lwh.nhs.uk.
authors.forename: Victoria
authors.identifier: http://orcid.org/0000-0001-9863-8632
authors.initials: V
authors.lastname: McKay
authors.affiliation: Merseyside and Cheshire Regional Molecular Genetics Laboratory, Liverpool Women's NHS Foundation Trust, Crown Street, Liverpool, L8 7SS, UK.
authors.forename: Diane
authors.initials: D
authors.lastname: Cairns
authors.affiliation: Merseyside and Cheshire Regional Molecular Genetics Laboratory, Liverpool Women's NHS Foundation Trust, Crown Street, Liverpool, L8 7SS, UK.
authors.forename: David
authors.initials: D
authors.lastname: Gokhale
authors.affiliation: Merseyside and Cheshire Regional Molecular Genetics Laboratory, Liverpool Women's NHS Foundation Trust, Crown Street, Liverpool, L8 7SS, UK.
authors.forename: Roger
authors.initials: R
authors.lastname: Mountford
authors.affiliation: Department of Clinical Genetics, Merseyside and Cheshire Regional Clinical Genetics Service, Liverpool Women's NHS Foundation Trust, Crown Street, Liverpool, L8 7SS, UK.
authors.forename: Lynn
authors.initials: L
authors.lastname: Greenhalgh
mesh_terms: D000091162:AMP-Activated Protein Kinase Kinases; D005260:Female; D006801:Humans; D008297:Male; D009030:Mosaicism; D060885:Multiplex Polymerase Chain Reaction; D009154:Mutation; D010580:Peutz-Jeghers Syndrome / Q000235:genetics*; D017346:Protein Serine-Threonine Kinases / Q000235:genetics*
chemical_list: D017346:Protein Serine-Threonine Kinases; C109790:STK11 protein, human; D000091162:AMP-Activated Protein Kinase Kinases
keywords: Deletion; LKB1; Peutz–Jeghers syndrome; STK11; Somatic mosaicism