Strain Name: |
B6C3Fe a/a-nma/J |
|---|---|
Stock Number: |
002339 |
Availability: | Repository-Cryopreserved |
General Terms and Conditions |
| Former Name |
B6C3Fe-a/a-nma (Changed: 15-DEC-04
) |
| Genes & Alleles | a; nma; |
Type JAX® GEMM® Strain - Mutant Stock Additional information on JAX® GEMM® Strains. Type JAX® GEMM® Strain - Spontaneous Mutation Species laboratory mouse Generation N23 Appearance
black
Related Genotype: a/aStrain Description
nma arose spontaneously in 1985 on the CBA/J inbred strain at The Jackson Laboratory. From the age of 12 days, mice homozygous for nma are smaller than their normal littermates, weighing 50% less. They exhibit an abnormal gait, in which the hind legs extend past the front legs, and hind limb weakness that causes the mice to fall to the side. When sitting, nma/nma mice overextend their rear legs and prop themselves up in the shavings or against the cage wall. When picked up by the tail, homozygotes extend their rear legs briefly, then clasp their hind feet. They cannot orient themselves in water and spiral to the bottom of the tank. nma/nma mice survive only a few days past weaning, even with food and water made readily available. Heterozygotes appear normal behaviorally, histologically and biochemically.Examination of serial sections through the entire brain revealed no abnormalities. The spinal cord motor neurons, spinal roots, ganglia and nerves were normally organized and myelinated. There was no muscular dystrophy or neurogenic atrophy of the skeletal muscle. Somatic organs appeared normal. Bone and muscle from the fore- and hindlimbs "showed no consistent abnormalities" and appeared normally innervated. X-ray analysis revealed normal hip joint structure, excluding hip abnormality as the reason for the hind limb overextension. ABR threshold analysis indicated that mice homozygous for nma have normal hearing at 18-21 days of age, and histological analysis of inner ears revealed no anomalies. Homozygotes exhibited significantly lower serum glucose and alanine aminotransferase (ALT) levels than normal littermates; blood urea nitrogen (BUN) did not differ. Heterozygote values were intermediate between those of the F1 parental strains, indicating that heterozygosity for nma has no effect on these parameters (Ward-Bailey et al. 2000).
Strain Development
The mutation neuromuscular ataxia (nma) arose spontaneously in strain CBA/J at generation F195 at The Jackson Laboratory in 1985. A carrier mouse was outcrossed to a B6C3Fe-a/a F1 and the F1 pairs were mated. It was continually backcrossed to the hybrid B6C3Fe-a/a by the cross-intercross method. It was cryopreserved in 1995 by mating heterozygotes at generation N22+.
Mammalian Phenotype Terms assigned by genotype |
| Allele Symbol | a | ||
|---|---|---|---|
| Allele Name | nonagouti | ||
| Allele Symbol | nma | ||
| Allele Name | neuromuscular ataxia | ||
| Strain of Origin | CBA/J | ||
Strains carrying a allele
View Strains carrying a (102 strains)
Strains carrying other alleles of a
View Strains carrying other alleles of a (67 strains)
nma related
Neurobiology Research
Ataxia (Movement) Defects
| Strain Name: | B6C3Fe a/a-nma/J |
| Stock Number: | 002339 |
IMPORTANT NOTE: Prices are based on shipping destination. To view prices, select your shipping destination.
| Standard Supply | Repository-Cryopreserved. Must Be Recovered. Please refer to pricing and supply notes for further information. |
|---|---|
| Supply Notes |
Cryorecovery - Standard. The recovery process begins when a signed agreement form is returned to the Customer Service Department after order placement. Although results vary by strain, at least two males and two females (two pairs) will be provided, typically within 15 weeks of our receipt of the signed agreement form. If the first recovery attempt is unsuccessful or only one pair is recovered, a second recovery will be done, extending the delivery time to approximately 25 weeks. At least one member of each pair will be of known genotype and will carry the mutation if it is a mutant strain. Please note that pairs may not reflect the mating scheme utilized by The Jackson Laboratory prior to cryopreservation of the strain. Mating schemes are sometimes modified for successful cryopreservation. Price represents a repository maintenance fee, which includes the cost of recovery of the strain from the cryopreservation resource and the periodic replacement of the frozen embryos used for recovery. Cryorecovery to establish a Dedicated Supply for greater quantities of mice. |
| Licensing | See General Terms and Conditions below |
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