Mutation in the abcb7 gene causes abnormal iron and fatty acid metabolism in developing medaka fish.
The medaka fish (Oryzias latipes) is an emerging model organism for which a variety of unique developmental mutants have now been generated. Our recent mutagenesis screening of the medaka isolated a unique mutant that develops a fatty liver at larval stages. Positional cloning identified the responsible gene as medaka abcb7. Abcb7, a mitochondrial ABC (ATP binding cassette) half-transporter, has been implicated in iron metabolism. Recently, human Abcb7 was found to be mutated in X-linked sideroblastic anemia with cerebellar ataxia (XLSA/A). The homozygous medaka mutant exhibits abnormal iron metabolism in erythrocytes and accumulation of lipid in the liver. Microarray and in situ hybridization analyses demonstrated that the expression of genes involved in iron and lipid metabolisms are both affected in the mutant liver, suggesting novel roles of Abcb7 in the development of physiologically functional liver. The medaka abcb7 mutant thus could provide insights into the pathogenesis of XLSA/A as well as the normal function of the gene.
Miyake
Akimitsu
A
Department of Biological Sciences, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo, Japan.
Higashijima
Shin-ichi
S
Kobayashi
Daisuke
D
Narita
Takanori
T
Jindo
Tomoko
T
Setiamarga
Davin H E
DH
Ohisa
Satoshi
S
Orihara
Nobuaki
N
Hibiya
Kenta
K
Konno
Sayaka
S
Sakaguchi
Sae
S
Horie
Kyohei
K
Imai
Yoshiyuki
Y
Naruse
Kiyoshi
K
Kudo
Akira
A
Takeda
Hiroyuki
H
D018528:ATP-Binding Cassette Transporters / Q000235:genetics*; D000818:Animals; D005227:Fatty Acids / Q000378:metabolism*; D005234:Fatty Liver / Q000196:embryology / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D006801:Humans; D019266:Iron, Dietary / Q000378:metabolism*; D008099:Liver / Q000196:embryology / Q000378:metabolism; D009154:Mutation; D020411:Oligonucleotide Array Sequence Analysis; D009990:Oryzias / Q000196:embryology* / Q000235:genetics / Q000378:metabolism*
C113037:ABCB7 protein, human; D018528:ATP-Binding Cassette Transporters; D005227:Fatty Acids; D019266:Iron, Dietary