Germline mutations of the LKB1 (STK11) gene in Peutz-Jeghers patients.

Abstract:

:Germline mutations of the LKB1 (STK11) serine/threonine kinase gene (chromosome 19p13.3) cause Peutz-Jeghers syndrome, which is characterised by hamartomas of the gastrointestinal tract and typical pigmentation. Peutz-Jeghers syndrome carries an overall risk of cancer that may be up to 20 times that of the general population. Here, we report the results of a screen for germline LKB1 mutations by DNA sequencing in 12 Peutz-Jeghers patients (three sporadic and nine familial cases). Mutations were found in seven (58%) cases, in exons 1, 2, 4, 6, and 9. Five of these mutations, two of which are identical, are predicted to lead to a truncated protein (three frameshifts, two nonsense changes). A further mutation is an in frame deletion of 6 bp, resulting in a deletion of lysine and asparagine; the second of these amino acids is conserved between species. The seventh mutation is a missense change in exon 2, converting lysine to arginine, affecting non-conserved amino acids and of uncertain functional significance. Despite the fact that Peutz-Jeghers syndrome is usually an early onset disease with characteristic clinical features, predictive and diagnostic testing for LKB1 mutations will be useful for selected patients in both familial and non-familial contexts.

journal_name

J Med Genet

authors

Wang ZJ,Churchman M,Avizienyte E,McKeown C,Davies S,Evans DG,Ferguson A,Ellis I,Xu WH,Yan ZY,Aaltonen LA,Tomlinson IP

keywords:

subject

Has Abstract

pub_date

1999-05-01 00:00:00

pages

365-8

issue

5

eissn

0022-2593

issn

1468-6244

journal_volume

36

pub_type

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