{"id":136233,"date":"2016-11-16T00:00:00","date_gmt":"2016-11-15T22:00:00","guid":{"rendered":"https:\/\/tvaryny.com\/?p=136233"},"modified":"2026-08-29T18:45:59","modified_gmt":"2026-08-29T15:45:59","slug":"panda-german-shepherd","status":"publish","type":"post","link":"https:\/\/tvaryny.com\/us\/breed-panda-shepherd-german-shepherd-panda","title":{"rendered":"Panda German Shepherd"},"content":{"rendered":"\n

The Panda German Shepherd<\/strong> is not a breed. It is a German Shepherd carrying a white-spotting mutation: the same build, the same mind, the same aptitude for work, but with large white areas where the breed standard does not provide for any. The mutation has been mapped, sequenced and published in a peer-reviewed genetics paper, so the “panda” is one of those rare cases where the origin of an unusual appearance can be discussed by naming a gene and an exact position within it, rather than by repeating hearsay. For more breed profiles, see Tvaryny<\/a>.<\/p>\n\n\n\n

The “panda” is not a breed, it is a mutation in the KIT gene<\/h2>\n\n\n\n
\"Panda<\/figure>\n\n\n\n

Let us begin with the fact that determines everything else on this page. The dogs called “pandas” are not a separate breed, not a designer hybrid, and not a Border Collie cross. They are German Shepherds that inherited a single change in the KIT<\/strong> gene \u2014 the gene of a receptor tyrosine kinase that governs the migration and maturation of melanocyte precursor cells. When that signal is weakened, some areas of skin simply receive no pigment cells, and the hair there grows white. So the white on a “panda” is not a different pigment and certainly not albinism: it marks the places the pigment cells never reached.<\/p>\n\n\n\n

The mutation arose spontaneously \u2014 de novo<\/em>, in one line of German Shepherds, in a dog whose parents carried no such pattern. Among owners, the founder is said to be a bitch named Lewcinka’s Franka von Phenom, born in October 2000 in the United States; every later “panda” is traced back to her. That name lives in breed circles and in kennel presentations, and we give it with exactly that status \u2014 the version accepted within the community, not a line from a scientific paper.<\/p>\n\n\n\n

What is genuinely recorded in the scientific literature is the mutation itself. The international database of inherited traits in animals, OMIA, gives it its own entry: OMIA:001737-9615, “Coat colour, white spotting, KIT-related”<\/strong> in the dog, gene KIT, chromosome CFA13. What is officially catalogued, therefore, is not a “panda breed” but the trait “white spotting, KIT-related”, documented in two breeds \u2014 the German Shepherd and the Weimaraner.<\/p>\n\n\n\n

How it was proved: linkage, exon 2 and ninety-five dogs<\/h2>\n\n\n\n

There is a single primary source here, and it deserves to be quoted in full: Wong A. K., Ruhe A. L., Robertson K. R., Loew E. R., Williams D. C., Neff M. W., “A de novo mutation in KIT causes white spotting in a subpopulation of German Shepherd dogs”, Animal Genetics, 2013, volume 44, issue 3, pp. 305\u2013310<\/strong> (published online on 8 November 2012). The first author worked at the Veterinary Genetics Laboratory of the University of California, Davis \u2014 the laboratory popular articles refer to as “UC Davis”.<\/p>\n\n\n\n

The approach was the classic one for mapping a trait. First a genome scan: 95 German Shepherds<\/strong> and 143 microsatellite markers<\/strong>. The signal converged on a single point \u2014 one locus on chromosome 13, the one that holds the KIT gene. Linkage strength: LOD = 15<\/strong>. To a geneticist that is not “this looks likely”; it is a question of location that is effectively closed.<\/p>\n\n\n\n

Next the exons of KIT were sequenced, and the cause emerged: the insertion of a single nucleotide \u2014 an adenine \u2014 70 bases from the start of the second exon<\/strong>. That one extra letter shifts the reading frame; premature stop codons appear soon after, and instead of a complete receptor of 974 amino acid residues the cell builds a fragment of 55 residues<\/strong>. This is loss of function in its purest form. In current nomenclature the variant is written c.140_141insA, p.(L48Vfs*10)<\/strong> (equivalently c.140dup); on the CanFam3.1 genome assembly it corresponds to g.47144513_47144514insA on chromosome 13. In OMIA it is variant no. 570.<\/p>\n\n\n\n

The final step was verification across the whole sample. Genotyping showed a perfect match between the insertion and the pattern: 64 spotted dogs and 31 normally colored littermates<\/strong>, without a single exception in either direction. When a trait and a variant never separate across nearly a hundred animals, the “it must be something else” hypothesis exhausts itself.<\/p>\n\n\n\n

There is one more point that is easy to miss and that is precisely what makes this work notable. Until then KIT was regarded as a gene “foreign” to canine spotting: in the pig, the cow, the horse, the cat and the human, white patches caused by KIT had long been described, but not in the dog. The authors state explicitly that they showed a loss-of-function mutation in KIT reproduces in the dog the same coat phenotypes observed in other species<\/em>. The “panda”, then, is not a curiosity: it is the first documented canine case of a mechanism well known elsewhere.<\/p>\n\n\n\n

Why the Border Collie theory does not hold<\/h2>\n\n\n\n
\"Panda<\/figure>\n\n\n\n

The suspicion is understandable: a white collar, a white blaze on the face, white feet \u2014 visually this really does suggest a herding dog from an entirely different corner of cynology. But genetics separates these cases more reliably than the eye does.<\/p>\n\n\n\n

In dogs, “ordinary” white spotting belongs to the S<\/strong> locus, and a completely different gene is responsible for it: MITF<\/strong>. That gene produces Irish spotting, piebald and extreme white in dozens of breeds. Merle is a third gene again, PMEL<\/strong>. The “panda” belongs to none of these mechanisms: in its case it is KIT \u2014 a different chromosome, a different protein, a different kind of breakage. Had the white come from a Border Collie, it would have arrived with the “collie” variant and would have segregated together with a whole stretch of foreign genome. The study shows the opposite: one new insertion, absent from the preceding generations.<\/p>\n\n\n\n

The second support is segregation. An infusion of another breed does not behave like a single dominant allele: it drags dozens of linked segments with it and produces a blurred variety of types. Here the trait behaves as a single locus: 64 spotted against 31 normal littermates, with a perfect match between genotype and phenotype.<\/p>\n\n\n\n

The third support is the repeatability of the mechanism. Independently of the American work, a German group described an analogous case in another breed: Gerding W. M., Akkad D. A., Epplen J. T., “Spotted Weimaraner dog due to de novo KIT mutation”, Animal Genetics, 2013, 44(5), pp. 605\u2013606<\/strong>. KIT again, a newly arisen mutation again \u2014 only a different one: a deletion of three nucleotides in the thirteenth exon, p.(L646del), right inside the tyrosine kinase domain. Two independent episodes in two different breeds mean that KIT can “break” in the dog on its own, without any outside blood.<\/p>\n\n\n\n

Inheritance: a dominant color \u2014 and the quiet side of the same mutation<\/h2>\n\n\n\n

As far as color is concerned the mutation behaves as autosomal dominant<\/strong>: a single copy is enough for a puppy to be born a “panda”. Hence a simple piece of Mendelian arithmetic \u2014 from a “panda \u00d7 ordinary shepherd” mating, about half the puppies are expected to inherit the allele and carry white, and half not. That is an expectation, not a guarantee for a given litter: in small numbers the ratios always fluctuate.<\/p>\n\n\n\n

And now the crucial point, the one popular articles get wrong most often. The same paper reports a second observation: no dog homozygous for this mutation was obtained across several intercrosses<\/strong> (P = 0.01). The authors interpret this as follows: in the homozygous state the allele is most probably recessive lethal at the embryonic stage<\/strong>. And they add that this is consistent with the behavior of KIT null alleles in other species. The OMIA database states the mode of inheritance in exactly two halves: dominant for coat color and recessive lethal for viability<\/em>.<\/p>\n\n\n\n

What that means in practice, without dramatizing:<\/p>\n\n\n\n