A model for GFR alpha 4 function and a potential modifying role in multiple endocrine neoplasia 2.

Abstract:

:Mutations of the RET proto-oncogene are found in the majority of patients with the inherited cancer syndrome multiple endocrine neoplasia type 2 (MEN 2). A minority of cases, however, have no detectable RET mutation and there is considerable phenotypic variation within and among MEN 2 families with the same RET mutation, suggesting a role for other loci in this disease. A candidate for such a gene is glial cell line-derived neurotrophic factor receptor alpha 4 (GFRA4), which encodes a cell surface-bound co-receptor (GFR alpha 4) required for interaction of RET with its ligand persephin. The GFRA4 gene has multiple alternative splices leading to three distinct protein isoforms that are prominently expressed in thyroid. We postulated that mutations of GFRA4 contribute to MEN 2 in the absence of RET mutations or modify the RET mutation phenotype. We screened patients with MEN 2 or MEN 2-like phenotypes, with and without RET mutations, for variants of GFRA4. We identified 10 variants, one of which was over represented in, and two of which were found exclusively in, our patient populations. One of these was a single-base substitution upstream of the GFR alpha 4 coding region, where it may alter gene expression. The second was a 7 bp insertion, which results in a change in reading frame for all three GFR alpha 4 isoforms. This would cause a relative shift in membrane bound and soluble forms of GFR alpha 4, which would significantly alter the formation of RET signalling complexes. Our data suggest a model of wild-type GFR alpha 4 isoform expression that includes both activating and inhibiting co-receptors for RET.

journal_name

Oncogene

journal_title

Oncogene

authors

Vanhorne JB,Andrew SD,Harrison KJ,Taylor SA,Thomas B,McDonald TJ,Ainsworth PJ,Mulligan LM

doi

10.1038/sj.onc.1207826

subject

Has Abstract

pub_date

2005-02-03 00:00:00

pages

1091-7

issue

6

eissn

0950-9232

issn

1476-5594

pii

1207826

journal_volume

24

pub_type

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