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Genetic Defects in Surfactant Protein A2 Are Associated with Pulmonary Fibrosis and Lung Cancer

By Yongyu Wang, Phillip J. Kuan, Chao Xing, Jennifer T. Cronkhite, Fernando Torres, Randall L. Rosenblatt, J. Michael DiMaio, Lisa N. Kinch, Nick V. Grishin and Christine Kim Garcia

Abstract

Idiopathic pulmonary fibrosis (IPF) is a lethal scarring lung disease that affects older adults. Heterozygous rare mutations in the genes encoding telomerase are found in ∼15% of familial cases. We have used linkage to map another disease-causing gene in a large family with IPF and adenocarcinoma of the lung to a 15.7 Mb region on chromosome 10. We identified a rare missense mutation in a candidate gene, SFTPA2, within the interval encoding surfactant protein A2 (SP-A2). Another rare mutation in SFTPA2 was identified in another family with IPF and lung cancer. Both mutations involve invariant residues in the highly conserved carbohydrate-recognition domain of the protein and are predicted to disrupt protein structure. Recombinant proteins carrying these mutations are retained in the endoplasmic reticulum and are not secreted. These data are consistent with SFTPA2 germline mutations that interfere with protein trafficking and cause familial IPF and lung cancer

Topics: Report
Publisher: Elsevier
OAI identifier: oai:pubmedcentral.nih.gov:2668050
Provided by: PubMed Central
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