Genetics of Wila KrungSri
The new mutation is located on the tyrosinase gene, the same gene that the siamese (cs) and burmese (cb) mutations are located on. The tentative naming for this new mutation is (cm) where the m stands for Mai Thong. Cats that have one allele for cb and one for cm are called Wila KrungSri. Wila = Cat and KrungSri = Ayuthaya (former capital of Thailand).
The table below indicates our current understanding and notation for describing the different combinations of genes. The observed color for Wila KrungSri (cbcm BB DD) in most known examples is very similar to a sepia Burmese (cbcb BB DD), however there are some notable differences in some cats. These cats have more of a uniform brown color over their entire body, indicating they may be less sensitive to temperature as compared to a cbcb cat. The eye color can range from a yellow (as expected) to more of a blue/aqua color as seen in the photos above. While some cats may be indistinguishable from sepia burmese, there are Wila KrungSri with a more uniform brown color and blue eyes which makes for an unusual and striking look not observed in any other breed of cat.
Wila KrungSri - Ayutthaya Cat
The International Maew Boran Association
Wila translates to Cat, and KrugSri translates to Ayutthaya, therefore can also be referred to as the Ayutthaya Cat. The naming concept involves the use of Wila, which comes from an older version of thai language (as opposed to Maew = Cat which comes from modern thai language) and KrungSri or Ayutthaya, the former capital of Thailand.