White cats, white spotting and deafness

New information on how white and white spotting works In October 2014 a research paper on the genes for white cats and dominant piebald spotting was published. Now UC Davis (VGL) has developed a DNA-test for this locus. What is new? The genes for dominant white W (self-coloured white) and dominant white spotting ws (previously S) are found on the same locus, as different alleles – variations of the gene. Risk factors for white cats being deaf or hearing is dependent of which genes they carry: Homozygous white cats WW are likely to be fully or partially deaf White carrying white spotting Wws have a higher risk of being deaf than White carrying non-white Ww White cats carrying non-white have a higher chance of hearing The number of tested and controlled cats is not large (270 cats from 30 cat breeds), but the study indicates that white cats should never be bred to other white cats (this is a rule in FIFe already) white cats should not be bred to white spotted cats, only non-white to lower risk of deaf offspring The different possibilities for this gene: Genotype Colour – Farge WW White cat – helhvit Wws White cat, carrier of white spotting – helhvit og bærer av hvitflekk Ww White cat, not carrier of white spotting – helhvit og ikke bærer av hvitflekk wsws White spotting (highwhite) – hvitflekk: van, harlekin eller bicolor wsw White spotting (bicolour or white paws/bib) – hvitflekk: bicolour eller hvitepoter+bryst/mage ww Not white or white spotting – ikke helhvit, ikke hvitflekk DNA-testing The locus can be tested at VGL, UC Davis for $50: Read more. The test is now (2018) also offered by Laboklin/Labogen, and included in the test panel at MyCatDNA. Risk of deafness for white cats, according to VGL and the study:…

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