objective(s) alzheimer’s disease (ad) is a complex disease with multifactorial etiology. inflammation has been proven to have an important role in the pathogenesis of ad. both ccr2 and ccr5 genes expression increase in ad patients comparing to control subjects. ccr5 gene encodes a protein which is a member of the beta chemokine receptors family of integral membrane proteins. ccr5-δ32 is a genet...

background: coronary artery disease (cad) is a multifactorial and heterogenic disease. recently, genome-wide association studies have reported that rs1333040 (c/t) and rs1004638 (a/t) single nucleotide polymorphisms (snps) in the 9p21 locus have very strong association with cad. this study aimed to examine these associations in southwest of iran. methods: blood samples were collected from 200 c...

alzheimer's disease (ad) is a genetically heterogeneous neurodegenerative disease and late-onset type (load) is the most common form of dementia affecting people over 65 years old. calhm1 (p86l) encodes a transmembrane glycoprotein that controls cytosolic ca2+ concentrations and aß levels and p86l polymorphism in this gene is significantly associated with load in independent case controls in a ...

late-onset alzheimer's disease (load) is a neurodegenerative disorder and the most common form of dementia affecting people over 65 years old. alzheimer’s disease is a complex disease with multi-factorial etiology. inflammation has been approved to have an important role in the pathogenesis of alzheimer’s disease (ad). tnf-a is a main pro-inflammatory cytokine that plays an essential role in in...

Genetic pleiotropy refers to the situation in which a single gene influences multiple traits and so it is considered as a major factor that underlies genetic correlation among traits. To identify pleiotropy, an important focus in genome-wide association studies (GWAS) is on finding genetic variants that are simultaneously associated with multiple traits. On the other hand, longitudinal designs ...

the rs2476601 (r620w, c1858t) polymorphism in ptpn22 gene has been repeatedly reported to be associated with rheumatoid arthritis (ra). the rs 2476601 is widely suggested for predictive testing and risk assessment for ra. the aim of this study was to test the possible association of this snp with ra in iranian population.a total of 872 samples (405 confirmed ra patients and 467 healthy controls...

Genetic association studies have become an important part of our scientific landscape. This commentary discusses some basic scientific issues which should be considered when reporting and evaluating such studies including SNP Discovery, Genotyping and Haplotype Analysis; Population Size, Matching of Cases and Controls, and Population Stratification; Phenotype Definition and Multiple Related Phe...

Model selection procedures for simultaneous analysis of all single-nucleotide polymorphisms in genome-wide association studies are most suitable for making full use of the data for a complex disease study. In this paper we consider a penalized regression using the LASSO procedure and show that post-processing of the penalized-regression results with subsequent stepwise selection may lead to imp...

Whole-genome association studies (WGAS) bring new computational, as well as analytic, challenges to researchers. Many existing genetic-analysis tools are not designed to handle such large data sets in a convenient manner and do not necessarily exploit the new opportunities that whole-genome data bring. To address these issues, we developed PLINK, an open-source C/C++ WGAS tool set. With PLINK, ...

In a two stage genome-wide association study (2S-GWAS), a sample of cases and controls is allocated into two groups, and genetic markers are analyzed sequentially with respect to these groups. For such studies, experimental design considerations have primarily focused on minimizing study cost as a function of the allocation of cases and controls to stages, subject to a constraint on the power t...