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Type Mutant Strain; Spontaneous Mutation; Additional information on Genetically Engineered and Mutant Mice. Visit our online Nomenclature tutorial. Species laboratory mouse Generation N14p Description
When mice homozygous for the twister spontaneous mutation (twt) are picked up by the tail, all affected mice tuck their heads. Homozygous mutant mice may show circling behavior or tilted heads and none can swim. These mice are deaf.Development
The twister mutation arose spontaneously in a Largemyd stock in 1977 at The Jackson Laboratory. An myd female from strain MYD/Le was outcrossed to a B6C3Fe-a/a hybrid male. The F1 offspring were intercrossed and at the F2 generation the first twister mutant appeared. The stock was then maintained by crossing to the hybrid B6C3Fe-a/a and intercrossing the next generation to produce the homozygote. Using this cross intercross system the stock was bred to N23 and cryopreserved in 1984 by mating homozygous (Otogtwt/Otogtwt) males at N13 to B6C3Fe-a/a F1 females.
Strains carrying a allele
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Strains carrying other alleles of a
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View Mammalian Phenotype Terms
Mammalian Phenotype Terms
assigned by genotype
Otogtwt/Otogtwt
involves: C3HeB/Fe * C57BL/6
- behavior/neurological phenotype
- abnormal pinna reflex (MGI Ref ID J:65390)
- Preyer reflex is normal at 3-4 weeks of age but by 10-20 weeks of age, a weak Preyer reflex is seen in 5 of 7 mutants
- abnormal placing response (MGI Ref ID J:65390)
- as early as P4, mutants exhibit head and trunk curling when picked up by their tail
- absent startle reflex (MGI Ref ID J:65390)
- none of the mutants at 10-20 weeks of age exhibit a body startle reflex
- hyperactivity (MGI Ref ID J:65390)
- some mutants show hyperactivity
- impaired balance (MGI Ref ID J:65390)
- the abnormal placing response, righting response, and response in the elevated platform test appear to result from impaired balance
- circling (MGI Ref ID J:65390)
- some mutants exhibit circling behavior
- all mutants adopt a swimming, circling style with tilted head but do not sink
- head tilt (MGI Ref ID J:65390)
- after 2 weeks of age, most mutants have a tilted head on one side
- all mutants adopt a swimming, circling style with tilted head but do not sink
- impaired coordination (MGI Ref ID J:65390)
- show an abnormal response in the elevated platform test
- impaired righting response (MGI Ref ID J:65390)
- mutants at P4 tend to stay on their back when placed upside down
- mutants show an abnormal response in the air righting reflex and in the contact righting reflex tests
- hearing/vestibular/ear phenotype
- abnormal crista ampullaris morphology (MGI Ref ID J:65390)
- in the cristae ampullares, the cupulae are detached in older (P170) mutants
- abnormal ear physiology (MGI Ref ID J:65390)
- abnormal pinna reflex (MGI Ref ID J:65390)
- Preyer reflex is normal at 3-4 weeks of age but by 10-20 weeks of age, a weak Preyer reflex is seen in 5 of 7 mutants
- absent startle reflex (MGI Ref ID J:65390)
- none of the mutants at 10-20 weeks of age exhibit a body startle reflex
- circling (MGI Ref ID J:65390)
- some mutants exhibit circling behavior
- all mutants adopt a swimming, circling style with tilted head but do not sink
- decreased brainstem auditory evoked potential (MGI Ref ID J:65390)
- the threshold sound pressure levels required for detection of an ABR are elevated in mutants both for a click stimulus an for all pure tone tested; the decrease in hearing sensitivity for a click stimulus averages 50 dB
- head tilt (MGI Ref ID J:65390)
- after 2 weeks of age, most mutants have a tilted head on one side
- all mutants adopt a swimming, circling style with tilted head but do not sink
- impaired hearing (MGI Ref ID J:65390)
- moderate to severe/profound hearing loss as indicated by the click- and pure one-evoked auditory brainstem response
- abnormal otolithic membrane (MGI Ref ID J:65390)
- in the saccule, the octoconial membrane is slightly displaced but is still partially attached to the sensory epithelium
- detached otolithic membrane (MGI Ref ID J:65390)
- the otoconial membrane is present but fully detached in the utricle
- reproductive system phenotype
- reduced fertility (MGI Ref ID J:65390)
- mutants are poor breeders
View Research Applications
Research Applications
This mouse can be used to support research in many areas including:Otogtwt related
Neurobiology Research
Vestibular and Hearing Defects
Sensorineural Research
Vestibular and Hearing Defects
| Allele Symbol | Otogtwt | ||
|---|---|---|---|
| Allele Name | twister | ||
| Allele Type | Spontaneous | ||
| Common Name(s) | twt; | ||
| Strain of Origin | (C57BL/6 x C3HeB/Fe-Largemyd)F1 | ||
| Gene Symbol and Name | Otog, otogelin | ||
| Chromosome | 7 | ||
| Gene Common Name(s) | FLJ46346; OTGN; mlemp; twister; twt; | ||
| Molecular Note | Complementation studies established that twister is an allele of Otog. Southern blot analysis of the mutant gene suggested that a point mutation or a small discrete rearrangement in the 3' region that created a new BstEII site was responsible for the mutant phenotype. [MGI Ref ID J:65390] | ||
| Allele Symbol | a | ||
| Allele Name | nonagouti | ||
| Allele Type | Spontaneous | ||
This strain will not have a genotyping protocol or one is not currently available.
Helpful Links
Genotyping resources and troubleshooting
Simmler MC; Zwaenepoel I; Verpy E; Guillaud L; Elbaz C; Petit C; Panthier JJ. 2000. Twister mutant mice are defective for otogelin, a component specific to inner ear acellular membranes Mamm Genome 11(11):960-6. [PubMed: 11063250] [MGI Ref ID J:65390]
Otogtwt relatedLane PW. 1981. Twister (twt) Mouse News Lett 64:59. [MGI Ref ID J:13873]
Simmler MC; Zwaenepoel I; Verpy E; Guillaud L; Elbaz C; Petit C; Panthier JJ. 2000. Twister mutant mice are defective for otogelin, a component specific to inner ear acellular membranes Mamm Genome 11(11):960-6. [PubMed: 11063250] [MGI Ref ID J:65390]
Steel KP. 1995. Inherited hearing defects in mice. Annu Rev Genet 29:675-701. [PubMed: 8825490] [MGI Ref ID J:30311]
Currently there no information available for this strain. This may be due to the supply level of this strain.
| Pricing for USA, Canada and Mexico shipping destinations |
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Animals Provided
Price (US dollars $) Cryorecovery Fee $1900.00 At least two mice that carry the mutation (if it is a mutant strain) will be provided. Their genotypes may not reflect those discussed in the strain description. Please inquire for possible genotypes and see additional details below.
| Pricing for International shipping destinations |
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Animals Provided
Price (US dollars $) Cryorecovery Fee $2470.00 At least two mice that carry the mutation (if it is a mutant strain) will be provided. Their genotypes may not reflect those discussed in the strain description. Please inquire for possible genotypes and see additional details below.
| Standard Supply | Cryopreserved. Ready for recovery. Please refer to pricing and supply notes for further information. |
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| Supply Notes |
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