FGF4_retrogene_CFA18

The famous FGF4 retrogene insertion on chromosome 18 (Parker 2009).

Where the leg length variant sits across every breed with data, by allele frequencyAllele frequencyWhat it isHow common a gene variant is across dogs, from 0% (none carry it) to 100% (all do).For your dogA high number means it's common in the breed. It does not tell you whether your own dog carries it.PreciselyThe proportion of sampled chromosomes in a population that carry the variant allele.Sniff Atlas (CanVAS) · measured · Ask about this → and grouped by AKC breed groupAKC breed groupWhat it isThe American Kennel Club's grouping of breeds by the job they were bred for: Sporting, Hound, Working, Herding, Terrier, Toy, Non-Sporting.PreciselyAKC parent-group classification. A registry convention reflecting historical use, not a genetic grouping.American Kennel Club · registry convention. Each tick is one breed; a variant fixed in one group and absent in another shows up as a gap. These come from one marker per trait, so read them as a tag, not a verdictA trait tag, not a verdictWhat it isThese frequencies come from one marker per trait. It predicts the trait for most breeds, but there are real exceptions.For your dogRead it as a tendency for the breed, never as a guarantee about your dog. One marker is not the whole story.PreciselySingle-SNP trait proxies are population tags, not deterministic genotype-to-phenotype calls. Penetrance, modifier loci, and breed-specific haplotypes cause exceptions (for example, the MSRB3 ear-type tag misreads Toy Poodles and Belgian Sheepdogs).Sniff Atlas methodology · known limitation, stated · Ask about this →: accurate for most breeds, with real exceptions.

1. Irish Wolfhound ancient_landrace
   100% n=286
2. Border Terrier terrier
   100% n=59
3. Flat Coated Retriever sporting
   100% n=48
4. French Bulldog non_sporting
   100% n=41
5. Pug toy
   100% n=31
6. Great Dane working
   100% n=30
7. Chinese Crested other
   100% n=25
8. Irish Setter sporting
   100% n=23
9. Otterhound hound
   100% n=23
10. Collie herding
    100% n=20

1. Pembroke Welsh Corgi herding
   0% n=24
2. Pekingese toy
   0% n=26
3. Norfolk Terrier terrier
   0% n=32
4. Tibetan Spaniel sporting
   0% n=42
5. Dachshund hound
   1% n=97
6. Shih Tzu toy
   1% n=38
7. Maltese toy
   2% n=96
8. Havanese toy
   2% n=54
9. Basset Hound hound
   3% n=34
10. Lhasa Apso non_sporting
    6% n=26

108 breeds with fewer than 20 genotyped dogs are not ranked here. At that sample size a single dog swings the frequency, so the figure is not yet stable enough to compare.