Updated: Dec. 30 (2023)
Fuzzy
Fuzzy, frcr/frh, frcr/frcr, and frh/frh
Either:
Other name: Fuzz, Frizzy
Chromosome: 1
RVG description:
The frcr/frcr phenotype will be the most naked, while the frh/frh phenotype will have some fuzz, especially around the genitals/tail, face and feet. The phenotype frh/frcr appears intermediate between that of the other two.
Charles River Hairless was once designated "hr" and Fuzzy designated "fz" but research have showing these two genes to be allelic meaning they exist on the same locus.
This type of hairless can be ID'ed at birth by curled or twisted whiskers. By 10 to 15 days Fuzzy is distinct from their standard siblings due to the abnormal coat type. The skin is pinkish and may present with neck folds. Adult males may have visible buck grease on their back which may make them seem yellow.
Quote: "For the sake of clarity, we suggest that both the CR hairless and the rat fz mutations be renamed frizzy-Charles River (fr^cr) and frizzy-Harlan (fr^h), respectively, to reflect their likely orthology with (and priority of) the mouse fr mutation, as well as to distinguish this locus from that identified by mouse fz".
Sources:
Either:
- One copy of Frizzy-Charles River and once copy of Frizzy-Harlan or
- two copies of Frizzy-Charles River or
- two copies of Frizzy-Harlan
Other name: Fuzz, Frizzy
Chromosome: 1
RVG description:
The frcr/frcr phenotype will be the most naked, while the frh/frh phenotype will have some fuzz, especially around the genitals/tail, face and feet. The phenotype frh/frcr appears intermediate between that of the other two.
Charles River Hairless was once designated "hr" and Fuzzy designated "fz" but research have showing these two genes to be allelic meaning they exist on the same locus.
This type of hairless can be ID'ed at birth by curled or twisted whiskers. By 10 to 15 days Fuzzy is distinct from their standard siblings due to the abnormal coat type. The skin is pinkish and may present with neck folds. Adult males may have visible buck grease on their back which may make them seem yellow.
Quote: "For the sake of clarity, we suggest that both the CR hairless and the rat fz mutations be renamed frizzy-Charles River (fr^cr) and frizzy-Harlan (fr^h), respectively, to reflect their likely orthology with (and priority of) the mouse fr mutation, as well as to distinguish this locus from that identified by mouse fz".
Sources: