An in vitro method for genotyping a Labrador Retriever comprising: a) obtaining a biological sample from the Labrador Retriever; b) genotyping a SUV39H2 gene encoding the polypeptide of SEQ ID NO: 1 and c) detecting the presence of a replacement of a nucleotide T with a nucleotide G at position 972 of SEQ ID NO: 2. view more

The method according to claim 1, wherein the genotyping is achieved by PCR, real-time PCR, melting point analysis of double-stranded DNA, mass spectroscopy, direct DNA sequencing, restriction fragment length polymorphism (RFLP), single strand conformation polymorphism (SSCP), high performance liquid chromatography (HPLC), or single base primer extension. view more

The method of claim 1, wherein the genotyping utilizes a primer pair comprising a first primer and a second primer, each comprising a contiguous span of at least 14 nucleotides of the sequence SEQ ID NO: 2 or a sequence complementary thereto, wherein: a) said first primer hybridizes to a first DNA strand of the SUV39H2 gene; b) said second primer hybridizes to the strand complementary to said first DNA strand of the SUV39H2 gene; and c) the 3′ ends of said first and second primers are located on regions flanking the position 972 of SEQ ID NO: 2, or of nucleotide positions complementary thereto. view more