Functional polymorphisms of HSPA5: possible association with bipolar disorder.
Altered endoplasmic reticulum stress (ER) response signaling is suggested in bipolar disorder. Previously, we preliminarily reported the genetic association of HSPA5 (GRP78/BiP) with bipolar disorder. Here, we extended our analysis by increasing the number of Japanese case-control samples and NIMH Genetics Initiative bipolar trio samples (NIMH trios), and also analyzed schizophrenia samples. In Japanese, nominally significant association of one haplotype was observed in extended samples of bipolar disorder but not in schizophrenia. In NIMH trios, no association was found in total samples. However, an exploratory analysis suggested that the other haplotype was significantly over-transmitted to probands only from the paternal side. The associated haplotype in Japanese or NIMH pedigrees shared three common polymorphisms in the promotor, which was found to alter promotor activity. These findings suggested promotor polymorphisms of HSPA5 may affect the interindividual variability of ER stress response and may confer a genetic risk factor for bipolar disorder.
Kakiuchi
Chihiro
C
Laboratory for Molecular Dynamics of Mental Disorders, Brain Science Institute, RIKEN, Wako-shi, Saitama, Japan.
Ishiwata
Mizuho
M
Nanko
Shinichiro
S
Kunugi
Hiroshi
H
Minabe
Yoshio
Y
Nakamura
Kazuhiko
K
Mori
Norio
N
Fujii
Kumiko
K
Umekage
Tadashi
T
Tochigi
Mamoru
M
Kohda
Kazuhisa
K
Sasaki
Tsukasa
T
Yamada
Kazuo
K
Yoshikawa
Takeo
T
Kato
Tadafumi
T
D000328:Adult; D001483:Base Sequence; D001714:Bipolar Disorder / Q000235:genetics* / Q000378:metabolism; D016022:Case-Control Studies; D045744:Cell Line, Tumor; D000091342:Endoplasmic Reticulum Chaperone BiP; D005260:Female; D020022:Genetic Predisposition to Disease; D006239:Haplotypes; D006360:Heat-Shock Proteins / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D008297:Male; D008875:Middle Aged; D018832:Molecular Chaperones / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D011110:Polymorphism, Genetic; D011401:Promoter Regions, Genetic; D012559:Schizophrenia / Q000235:genetics / Q000378:metabolism
D000091342:Endoplasmic Reticulum Chaperone BiP; C000717247:HSPA5 protein, human; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones