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Ann Rheum Dis. 2012 Nov;71(11):1900-3. doi: 10.1136/annrheumdis-2012-201755. Epub 2012 Aug 15.

TGFβ receptor gene variants in systemic sclerosis-related pulmonary arterial hypertension: results from a multicentre EUSTAR study of European Caucasian patients.

Author information

1
Paris Descartes University, INSERM U1016, Institut Cochin, Sorbonne Paris Cité, Paris, France.

Abstract

INTRODUCTION:

Systemic sclerosis (SSc)-related pulmonary arterial hypertension (PAH) has emerged as a major mortality prognostic factor. Mutations of transforming growth factor beta (TGFβ) receptor genes strongly contribute to idiopathic and familial PAH.

OBJECTIVE:

To explore the genetic bases of SSc-PAH, we combined direct sequencing and genotyping of candidate genes encoding TGFβ receptor family members.

MATERIALS AND METHODS:

TGFβ receptor genes, BMPR2, ALK1, TGFR2 and ENG, were sequenced in 10 SSc-PAH patients, nine SSc and seven controls. In addition, 22 single-nucleotide polymorphisms (SNP) of these four candidate genes were tested for association in a first set of 824 French Caucasian SSc patients (including 54 SSc-PAH) and 939 controls. The replication set consisted of 1516 European SSc (including 219 SSc-PAH) and 3129 controls from the European League Against Rheumatism Scleroderma Trials and Research group network.

RESULTS:

No mutation was identified by direct sequencing. However, two repertoried SNP, ENG rs35400405 and ALK1 rs2277382, were found in SSc-PAH patients only. The genotyping of 22 SNP including the latter showed that only rs2277382 was associated with SSc-PAH (p=0.0066, OR 2.13, 95% CI 1.24 to 3.65). Nevertheless, this was not replicated with the following result in combined analysis: p=0.123, OR 0.79, 95% CI 0.59 to 1.07.

CONCLUSIONS:

This study demonstrates the lack of association between these TGFβ receptor gene polymorphisms and SSc-PAH using both sequencing and genotyping methods.

PMID:
22896741
DOI:
10.1136/annrheumdis-2012-201755
[Indexed for MEDLINE]

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