Age-dependent variation of genotypes in MHC II transactivator gene (CIITA) in controls and association to type 1 diabetes.
The major histocompatibility complex class II transactivator (CIITA) gene (16p13) has been reported to associate with susceptibility to multiple sclerosis, rheumatoid arthritis and myocardial infarction, recently also to celiac disease at genome-wide level. However, attempts to replicate association have been inconclusive. Previously, we have observed linkage to the CIITA region in Scandinavian type 1 diabetes (T1D) families. Here we analyze five Swedish T1D cohorts and a combined control material from previous studies of CIITA. We investigate how the genotype distribution within the CIITA gene varies depending on age, and the association to T1D. Unexpectedly, we find a significant difference in the genotype distribution for markers in CIITA (rs11074932, P=4 × 10(-5) and rs3087456, P=0.05) with respect to age, in the collected control material. This observation is replicated in an independent cohort material of about 2000 individuals (P=0.006, P=0.007). We also detect association to T1D for both markers, rs11074932 (P=0.004) and rs3087456 (P=0.001), after adjusting for age at sampling. The association remains independent of the adjacent T1D risk gene CLEC16A. Our results indicate an age-dependent variation in CIITA allele frequencies, a finding of relevance for the contrasting outcomes of previously published association studies.
Neuroimmunology Unit, Department of Clinical Neuroscience, Centre for Molecular Medicine, L8:05, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden. alexandra.gyllenberg@ki.se
A
A
Gyllenberg
S
S
Asad
F
F
Piehl
M
M
Swanberg
L
L
Padyukov
B
B
Van Yserloo
E A
EA
Rutledge
B
B
McNeney
J
J
Graham
M
M
Orho-Melander
E
E
Lindholm
C
C
Graff
C
C
Forsell
K
K
Akesson
M
M
Landin-Olsson
A
A
Carlsson
G
G
Forsander
S A
SA
Ivarsson
H
H
Larsson
B
B
Lindblad
J
J
Ludvigsson
C
C
Marcus
A
A
Lernmark
L
L
Alfredsson
K
K
Akesson
T
T
Olsson
I
I
Kockum
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000483:Alleles; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D037181:Lectins, C-Type / Q000235:genetics; D015810:Linkage Disequilibrium; D008297:Male; D009004:Monosaccharide Transport Proteins / Q000235:genetics; D009687:Nuclear Proteins / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D013548:Sweden; D015534:Trans-Activators / Q000235:genetics*; D044465:White People
C522505:CLEC16A protein, human; D037181:Lectins, C-Type; C083728:MHC class II transactivator protein; D009004:Monosaccharide Transport Proteins; D009687:Nuclear Proteins; D015534:Trans-Activators