Co-inheritance of a novel deletion of the entire SPINK1 gene with a CFTR missense mutation (L997F) in a family with chronic pancreatitis.

Abstract:

:Quantitative fluorescent multiplex PCR (QFM-PCR) was established in order to make possible the rapid and efficient mutational analysis of the pancreatic secretory trypsin inhibitor (SPINK1) gene. Using QFM-PCR, a novel heterozygous deletion encompassing the entire SPINK1 gene was identified in one of nine newly recruited French Caucasian families with chronic pancreatitis. The breakpoints were fully characterized and the approximately 30 kb deletion was termed c.1-15969_c.240+7702del30588bp. Whilst sequences with the potential to form non-B DNA structures were found to span both the 5' and 3' deletion breakpoints, the generation of this gross deletion is potentially explicable in terms of non-homologous end-joining facilitated by the presence of a 1-bp microhomology at the two ends. The SPINK1 gene deletion identified in the index patient was also detected in her affected father and paternal uncle but not in 50 healthy French Caucasians. Remarkably, in all three affected individuals, the SPINK1 deletion was found to be co-inherited with a heterozygous p.L997F missense mutation in the unlinked CFTR gene, a lesion previously reported to be associated with a variety of cystic fibrosis-related diseases including idiopathic pancreatitis. Given that the SPINK1 deletion constitutes a clear-cut disease-causing factor, it may be that the CFTR missense mutation acts as a disease modifier in the context of this particular family.

journal_name

Mol Genet Metab

authors

Masson E,Le Maréchal C,Levy P,Chuzhanova N,Ruszniewski P,Cooper DN,Chen JM,Férec C

doi

10.1016/j.ymgme.2007.06.006

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

168-75

issue

1-2

eissn

1096-7192

issn

1096-7206

pii

S1096-7192(07)00200-4

journal_volume

92

pub_type

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