The association of the MYH9 gene and kidney outcomes  in American Indians: the Strong Heart Family Study.
Chronic kidney disease (CKD) is an important public health problem in American Indian populations. Recent research has identified associations of polymorphisms in the myosin heavy chain type II isoform A (MYH9) gene with hypertensive CKD in African-Americans. Whether these associations are also present among American Indian individuals is unknown. To evaluate the role of genetic polymorphisms in the MYH9 gene on kidney disease in American Indians, we genotyped 25 SNPs in the MYH9 gene region in 1,119 comparatively unrelated individuals. Four SNPs failed, and one SNP was monomorphic We inferred haplotypes using seven SNPs within the region of the previously described E haplotype using Phase v2.1. We studied the association between 20 MYH9 SNPs with kidney function (estimated glomerular filtration rate, eGFR) and CKD (eGFR\60 ml/min/1.73 m(2) or renal replacement therapy or kidney transplant) using age-, sex- and center-adjusted models and measured genotyped within the variance component models. MYH9 SNPs were not significantly associated with kidney traits in additive or recessive genetic adjusted models. MYH9 haplotypes were also not significantly associated with kidney outcomes. In conclusion, common variants in MYH9 polymorphisms may not confer an increased risk of CKD in American Indian populations. Identification of the actual functional genetic variation responsible for the associations seen in African-Americans will likely help to clarify the lack of replication of this gene in our population of American Indians.
Franceschini
Nora
N
Department of Epidemiology, University of North Carolina, Chapel Hill, NC 27514, USA. noraf@unc.edu
Voruganti
V Saroja
VS
Haack
Karin
K
Almasy
Laura
L
Laston
Sandy
S
Goring
Harald H H
HH
Umans
Jason G
JG
Lee
Elisa T
ET
Best
Lyle G
LG
Fabsitz
Richard R
RR
MacCluer
Jean W
JW
Howard
Barbara V
BV
North
Kari E
KE
Cole
Shelley A
SA
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002318:Cardiovascular Diseases / Q000150:complications / Q000235:genetics; D002908:Chronic Disease; D005190:Family; D005260:Female; D005500:Follow-Up Studies; D005787:Gene Frequency; D055106:Genome-Wide Association Study; D006801:Humans; D007198:Indians, North American / Q000235:genetics* / Q000706:statistics & numerical data; D007674:Kidney Diseases / Q000453:epidemiology / Q000209:etiology / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D020409:Molecular Motor Proteins / Q000235:genetics*; D018995:Myosin Heavy Chains / Q000235:genetics*; D017063:Outcome Assessment, Health Care; D020641:Polymorphism, Single Nucleotide / Q000502:physiology; D012307:Risk Factors; D055815:Young Adult
C103814:MYH9 protein, human; D020409:Molecular Motor Proteins; D018995:Myosin Heavy Chains