This article is part of the supplement: Genetic Analysis Workshop 15: Gene Expression Analysis and Approaches to Detecting Multiple Functional Loci

Proceedings

Analysis of variation in NF-κB genes and expression levels of NF-κB-regulated molecules

Wen Liu-Mares¹ , Zhifu Sun¹ , William R Bamlet² , Elizabeth J Atkinson² , Brooke L Fridley² , Susan L Slager² , Mariza de Andrade² and Ellen L Goode¹

¹Division of Epidemiology, Department of Health Sciences Research, Mayo Clinic College of Medicine, 200 First Street Southwest, Rochester, Minnesota 55905, USA

²Division of Biostatistics, Department of Health Sciences Research, Mayo Clinic College of Medicine, Rochester, 200 First Street Southwest, Harwick 7, Rochester, Minnesota 55905, USA

author email corresponding author email

BMC Proceedings 2007, 1(Suppl 1):S126

Published:	18 December 2007

Abstract

The nuclear factor-kappaB (NF-κB) family of transcription factors regulates the expression of a variety of genes involved in apoptosis and immune response. We examined relationships between genotypes at five NF-κB subunits (NFKB1, NFKB2, REL, RELA, and RELB) and variable expression levels of 15 NF-κB regulated proteins with heritability greater than 0.40: BCL2A1, BIRC2, CD40, CD44, CD80, CFLAR, CR2, FAS, ICAM1, IL15, IRF1, JUNB, MYC, SLC2A5, and VCAM1. SNP genotypes and expression phenotypes from pedigrees of Utah residents with ancestry from northern and western Europe were provided by Genetic Analysis Workshop 15 and supplemented with additional genotype data from the International HapMap Consortium. We conducted association, linkage, and family-based association analyses between each candidate gene and the 15 heritable expression phenotypes. We observed consistent results in association and linkage analyses of the NFKB1 region (encoding p50) and levels of FAS and IRF1 expression. FAS is a cell surface protein that also belongs to the TNF-receptor family; signals through FAS are able to induce apoptosis. IRF1 is a member of the interferon regulatory transcription factor family, which has been shown to regulate apoptosis and tumor-suppression. Analyses in the REL region (encoding c-Rel) revealed linkage and association with CD40 phenotype. CD40 proteins belong to the tumor necrosis factor (TNF)-receptor family, which mediates a broad variety of immune and inflammatory responses. We conclude that variation in the genes encoding p50 and c-Rel may play a role in NF-κB-related transcription of FAS, IRF1, and CD40.