title: Different human copper-zinc superoxide dismutase mutants, SOD1G93A and SOD1H46R, exert distinct harmful effects on gross phenotype in mice.
abstract: Amyotrophic lateral sclerosis (ALS) is a heterogeneous group of fatal neurodegenerative diseases characterized by a selective loss of motor neurons in the brain and spinal cord. Creation of transgenic mice expressing mutant Cu/Zn superoxide dismutase (SOD1), as ALS models, has made an enormous impact on progress of the ALS studies. Recently, it has been recognized that genetic background and gender affect many physiological and pathological phenotypes. However, no systematic studies focusing on such effects using ALS models other than SOD1(G93A) mice have been conducted. To clarify the effects of genetic background and gender on gross phenotypes among different ALS models, we here conducted a comparative analysis of growth curves and lifespans using congenic lines of SOD1(G93A) and SOD1(H46R) mice on two different genetic backgrounds; C57BL/6N (B6) and FVB/N (FVB). Copy number of the transgene and their expression between SOD1(G93A) and SOD1(H46R) lines were comparable. B6 congenic mutant SOD1 transgenic lines irrespective of their mutation and gender differences lived longer than corresponding FVB lines. Notably, the G93A mutation caused severer disease phenotypes than did the H46R mutation, where SOD1(G93A) mice, particularly on a FVB background, showed more extensive body weight loss and earlier death. Gender effect on survival also solely emerged in FVB congenic SOD1(G93A) mice. Conversely, consistent with our previous study using B6 lines, lack of Als2, a murine homolog for the recessive juvenile ALS causative gene, in FVB congenic SOD1(H46R), but not SOD1(G93A), mice resulted in an earlier death, implying a genetic background-independent but mutation-dependent phenotypic modification. These results indicate that SOD1(G93A)- and SOD1(H46R)-mediated toxicity and their associated pathogenic pathways are not identical. Further, distinctive injurious effects resulted from different SOD1 mutations, which are associated with genetic background and/or gender, suggests the presence of several genetic modifiers of disease expression in the mouse genome.
authors.affiliation: Department of Molecular Life Sciences, Tokai University School of Medicine, Isehara, Kanagawa, Japan.
authors.forename: Lei
authors.initials: L
authors.lastname: Pan
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Yoshii
authors.forename: Asako
authors.initials: A
authors.lastname: Otomo
authors.forename: Haruko
authors.initials: H
authors.lastname: Ogawa
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Iwasaki
authors.forename: Hui-Fang
authors.initials: HF
authors.lastname: Shang
authors.forename: Shinji
authors.initials: S
authors.lastname: Hadano
mesh_terms: D019943:Amino Acid Substitution; D000690:Amyotrophic Lateral Sclerosis / Q000201:enzymology* / Q000235:genetics* / Q000473:pathology / Q000503:physiopathology; D000818:Animals; D001483:Base Sequence; D004195:Disease Models, Animal; D005260:Female; D018628:Gene Dosage; D056726:Genetic Association Studies; D020662:Guanine Nucleotide Exchange Factors / Q000172:deficiency / Q000235:genetics; D006801:Humans; D008297:Male; D051379:Mice; D020297:Mice, Congenic; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D018345:Mice, Knockout; D008822:Mice, Transgenic; D050505:Mutant Proteins / Q000235:genetics* / Q000502:physiology*; D020125:Mutation, Missense; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D013482:Superoxide Dismutase / Q000235:genetics* / Q000502:physiology*; D000072105:Superoxide Dismutase-1
chemical_list: C512358:Als2 protein, mouse; D020662:Guanine Nucleotide Exchange Factors; D050505:Mutant Proteins; D012333:RNA, Messenger; C000606290:SOD1 protein, human; C109415:SOD1 G93A protein; C000606291:Sod1 protein, mouse; D013482:Superoxide Dismutase; D000072105:Superoxide Dismutase-1