Haplotypic association spanning the 22q11.21 genes COMT and ARVCF with schizophrenia.
Catechol-O-methyltransferase (COMT) has been implicated in schizophrenia by its function through its roles in monoamine neurotransmitter metabolism and its impact on prefrontal cognition, and also by its position through linkage scans and a strong cytogenetic association. Further support comes from association studies, especially family-based ones examining the COMT variant, Val(108/158)Met. We have studied eight markers spanning COMT and including portions of the two immediately adjacent genes, thioredoxin reductase 2 and armadillo repeat deleted in velocardiofacial syndrome (ARVCF), using association testing in 136 schizophrenia families. We found nominal evidence for association of illness to rs165849 (P=0.051) in ARVCF, and a stronger signal (global P=0.0019-0.0036) from three-marker haplotypes spanning the 3' portions of COMT and ARVCF, including Val(108/158)Met with Val(108/158) being the overtransmitted allele, consistent with previous studies. We also find Val(108/158)Met to be in linkage disequilibrium with the markers in ARVCF. These findings support previous association signals of schizophrenia to COMT markers, and suggest that ARVCF might contribute to this signal. ARVCF, a member of the catenin family, besides being a positional candidate, is also one due to its function, that is, its potential role in neurodevelopment, which is implicated in schizophrenia pathogenesis by several lines of evidence.
Sanders
A R
AR
Department of Psychiatry and Behavioral Sciences, Evanston Northwestern Healthcare Research Institute, Center for Psychiatric Genetics, Northwestern University, Evanston, IL 60201, USA. asanders@northwestern.edu
Rusu
I
I
Duan
J
J
Vander Molen
J E
JE
Hou
C
C
Schwab
S G
SG
Wildenauer
D B
DB
Martinez
M
M
Gejman
P V
PV
D000328:Adult; D019943:Amino Acid Substitution / Q000235:genetics; D051186:Armadillo Domain Proteins; D002394:Catechol O-Methyltransferase / Q000235:genetics*; D015815:Cell Adhesion Molecules / Q000235:genetics*; D002874:Chromosome Mapping; D002892:Chromosomes, Human, Pair 22 / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D005819:Genetic Markers; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium; D008297:Male; D010375:Pedigree; D010750:Phosphoproteins / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D012559:Schizophrenia / Q000201:enzymology / Q000235:genetics*; D054482:Thioredoxin Reductase 2; D013880:Thioredoxin-Disulfide Reductase / Q000235:genetics
C411307:ARVCF protein, human; D051186:Armadillo Domain Proteins; D015815:Cell Adhesion Molecules; D005819:Genetic Markers; D010750:Phosphoproteins; C516127:TXNRD2 protein, human; D054482:Thioredoxin Reductase 2; D013880:Thioredoxin-Disulfide Reductase; D002394:Catechol O-Methyltransferase