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| Nomenclature |
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Symbol:
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Neu1a
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Name:
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neuraminidase 1;
a variant
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MGI ID: |
MGI:3042795 |
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Synonyms: |
Neu-1s |
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Gene:
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Neu1
Location:
Chr17:35068324-35072266 bp, + strand
Genetic Position: Chr17,
18.93 cM
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Mutation
origin |
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Mutation
description |
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Allele
Type: |
Not Applicable |
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Mutation: |
Nucleotide substitutions |
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Sequencing of the a allele revealed 5 nucleotide differences compared to the b allele. These changes alter the amino acid residues 11, 15, 17, 19 and 209 of the encoded protein from Gly, Tyr, Ala, Arg and Leu to Arg, Cys, Val, Cys and Ile, respectively. This encoded protein has 85-95% less activity than the protein encoded by the b allele as demonstrated in an in vitro assay. Further studies attributed most of the activity loss to the variation at position 209. Later studies detected 4 silent mutations in the signal peptide sequence and 2 mutations (c.-240C>T and c.-519G>A) in the promoter region. The mutation c.-519G>A creates a novel binding site for Nkx3-1 and Nkx3-2. In vitro assays demonstrated that binding of Nkx3-2 specifically represses promoter driven expression. (J:43930, J:77236, J:147881) |
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Inheritance: |
Codominant |
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| Find Mice (IMSR) |
Mouse strains and cell lines available from the
International Mouse Strain Resource
(IMSR)
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Phenotype
summary
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Phenotype Summary by Mammalian Phenotype terms
(show or
hide all annotated terms)
Genotypes are listed in the next section.
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Key:
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| hm |
homozygous |
ht |
heterozygous |
| cn |
conditional genotype |
cx |
complex: > 1 genome feature |
| tg |
involves transgenes |
ot |
other: hemizygous, indeterminate,... |
| N |
normal phenotype |
 |
expected model not found |
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Phenotypic
data by
genotype
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Phenotypic Data by Genotype
(show or
hide all phenotypic details)
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| Genotype | Allelic Composition | Genetic Background |
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  hm1
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Neu1a/Neu1a |
B6.SM-Neu1a |
homeostasis/metabolism growth/size |
| Genotype | Allelic Composition | Genetic Background |
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hm2
Disease Model |
Neu1a/Neu1a |
SM/J |
homeostasis/metabolism growth/size liver/biliary system renal/urinary system hematopoietic system immune system |
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Disease
models
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Notes |
Low activity determined by the Neu1a allele occurs in the SM/J inbred strain and in wild mice in the area of Ann Arbor, Michigan; all other inbred strains have high activity determined by the Neu1b allele. Heterozygotes have intermediate activity. Neuraminidase removes extra sialic acid residues from these enzymes. The defective neuraminidase of Neu1a> mice, by failing to remove the extra sialic acid, changes their electrophoretic mobility (J:6480). Level of activity of neuraminidase in activated T lymphocytes is also depressed in Neu1a/Neu1a mice (J:7976).
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| References |
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Original: |
J:6899
Womack JE et al.,
"Mouse gene for neuraminidase activity (Neu-1) maps to the D end of H-2."
Immunogenetics 1982;16(2):177-80
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All: |
9 reference(s)
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