Genetic association study identifies HSPB7 as a risk gene for idiopathic dilated cardiomyopathy.
Dilated cardiomyopathy (DCM) is a structural heart disease with strong genetic background. Monogenic forms of DCM are observed in families with mutations located mostly in genes encoding structural and sarcomeric proteins. However, strong evidence suggests that genetic factors also affect the susceptibility to idiopathic DCM. To identify risk alleles for non-familial forms of DCM, we carried out a case-control association study, genotyping 664 DCM cases and 1,874 population-based healthy controls from Germany using a 50K human cardiovascular disease bead chip covering more than 2,000 genes pre-selected for cardiovascular relevance. After quality control, 30,920 single nucleotide polymorphisms (SNP) were tested for association with the disease by logistic regression adjusted for gender, and results were genomic-control corrected. The analysis revealed a significant association between a SNP in HSPB7 gene (rs1739843, minor allele frequency 39%) and idiopathic DCM (p = 1.06 × 10⁻⁶, OR  = 0.67 [95% CI 0.57-0.79] for the minor allele T). Three more SNPs showed p < 2.21 × 10⁻⁵. De novo genotyping of these four SNPs was done in three independent case-control studies of idiopathic DCM. Association between SNP rs1739843 and DCM was significant in all replication samples: Germany (n =564, n = 981 controls, p = 2.07 × 10⁻³, OR = 0.79 [95% CI 0.67-0.92]), France 1 (n = 433 cases, n = 395 controls, p =3.73 × 10⁻³, OR  = 0.74 [95% CI 0.60-0.91]), and France 2 (n = 249 cases, n = 380 controls, p = 2.26 × 10⁻⁴, OR  = 0.63 [95% CI 0.50-0.81]). The combined analysis of all four studies including a total of n = 1,910 cases and n = 3,630 controls showed highly significant evidence for association between rs1739843 and idiopathic DCM (p = 5.28 × 10⁻¹³, OR= 0.72 [95% CI 0.65-0.78]). None of the other three SNPs showed significant results in the replication stage.This finding of the HSPB7 gene from a genetic search for idiopathic DCM using a large SNP panel underscores the influence of common polymorphisms on DCM susceptibility.
Klinik und Poliklinik für Innere Medizin II, Universitätsklinikum Regensburg, Regensburg, Germany.
Klaus
K
Stark
Ulrike B
UB
Esslinger
Wibke
W
Reinhard
George
G
Petrov
Thomas
T
Winkler
Michel
M
Komajda
Richard
R
Isnard
Philippe
P
Charron
Eric
E
Villard
François
F
Cambien
Laurence
L
Tiret
Marie-Claude
MC
Aumont
Olivier
O
Dubourg
Jean-Noël
JN
Trochu
Laurent
L
Fauchier
Pascal
P
Degroote
Anette
A
Richter
Bernhard
B
Maisch
Thomas
T
Wichter
Christa
C
Zollbrecht
Martina
M
Grassl
Heribert
H
Schunkert
Patrick
P
Linsel-Nitschke
Jeanette
J
Erdmann
Jens
J
Baumert
Thomas
T
Illig
Norman
N
Klopp
H-Erich
HE
Wichmann
Christa
C
Meisinger
Wolfgang
W
Koenig
Peter
P
Lichtner
Thomas
T
Meitinger
Arne
A
Schillert
Inke R
IR
König
Roland
R
Hetzer
Iris M
IM
Heid
Vera
V
Regitz-Zagrosek
Christian
C
Hengstenberg
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002311:Cardiomyopathy, Dilated / Q000235:genetics*; D016022:Case-Control Studies; D002648:Child; D005260:Female; D005787:Gene Frequency; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D005838:Genotype; D055551:HSP27 Heat-Shock Proteins / Q000235:genetics*; D006801:Humans; D015810:Linkage Disequilibrium; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D020641:Polymorphism, Single Nucleotide; D012307:Risk Factors; D017422:Sequence Analysis, DNA; D055815:Young Adult
D055551:HSP27 Heat-Shock Proteins; C550985:HSPB7 protein, human