Allele Symbol: Ay
Name: agouti yellow
Alteration at locus: Spontaneous Mutation
ES Cell Line: Not applicable
The mutant allele is characterized by yellow color, obesity, and diabetes in heterozygotes. It is prenatal lethal in the homozygous state. Therefore, black offspring will be produced every generation. In mice mutant at the agouti locus, these phenotypes are all reduced if the phenotype of the mouse is more eumelanic than pheomelanic,as is the case when the same mutant allele is backcrossed onto the JU/CtLm (MMRRC:000136) inbred background. The mice are yellow until the first molt, then become umbrous (darker dorsally). After about 6 months of age, this umbrous phenotype is gradually lost.Mammalian Phenotype Terms:
Strain of Origin: old mutant of the mouse fancy
Strain genetic background: JU/CtLm (MMRRC:000136)
Strain Development: Spontaneous mutation maintained by backcross to wildtype JU/CtLm (MMRRC:000136) mice.
Suggested Control Mice:
Donor: Dr. M. L. Lamoreux, Texas A&M University
Feed mouse chow that contains 4 percent fat.
Coat color: Yellow
MMRRC Breeding System: Backcross
Overall Breeding Performance: Good for young mice but quickly drops off as mice age. Both males and females quickly become sterile if they become obese.
|Viability and Fertility:||Female||Male||Comments|
|Homozygotes are viable:||No||No|
|Homozygotes are fertile:||No||No|
|Heterozygotes are fertile:||Yes||Yes|
|Age Reproductive Decline:||20 weeks||20 weeks|
Average litter size: Unknown
Recommended wean age: 4 weeks
Limited quantities of breeder mice (recovered litter) are available from a cryoarchive; recovered litter usually available to ship in 3 to 4 months.
Fee/unit (US $)
|Litter||Recovered litter1; additional fees for any special requests.|
|Aliquot||Approximate quantity3: 20-40 embryos / aliquot|
1 The distribution fee covers the expense of resuscitating mice from the cryo-archive; you will receive the resulting litter. The litter will contain at minimum one mutant carrier; the actual number of animals and the gender and genotype ratios will vary. (Typically, multiple breeder pairs can be established from the recovered litter.) Prior to shipment, the MMRRC will provide information about the animals recovered. If you anticipate or find that you need to request specific genotypes, genders or quantities of mice in excess of what is likely from a resuscitated litter, you may discuss available options and pricing with the supplying MMRRC facility.
2 An aliquot is one straw or vial with sufficient sperm to recover at least one litter of mice, as per provided protocols, when performed at the MMRRC facility. The MMRRC makes no guarantee concerning the success of these procedures when performed outside the MMRRC facilities.
3 An aliquot contains a sufficient number of embryos (in one or more vials and based on the transfer success rate of the MMRRC facility) to transfer to at least two recipients. The MMRRC makes no guarantee concerning embryo transfer success experienced in the recipient investigator's laboratory. Neither gender nor genotype ratios are guaranteed.
To request material from the MMRRC: Please fill out our on-line request form (accessible from the catalog search results page, or click the Request this Strain button in the fees section). If you have questions or need assistance completing this form, you may call Customer Service at (800) 910-2291 (in USA or Canada) or (530) 757-5710 (international calls). Before you call, please have with you: the MMRRC item number, quantity needed, Bill-to and Ship-to contact information.