Serum homocysteine and methylmalonic acid concentrations in Chinese Shar-Pei dogs with cobalamin deficiency. Academic Article uri icon


  • Cobalamin deficiency is suspected to be hereditary in Chinese Shar-Pei dogs (Shar-Peis), and inherited causes of cobalamin deficiency may affect the cellular processing of cobalamin. In humans, a defect of the two main cobalamin-dependent intracellular enzymes (i.e., methionine synthase and methylmalonyl-CoA mutase) may lead to hyperhomocysteinemia and hypermethylmalonic acidemia. The aim of this retrospective study was to evaluate serum homocysteine (HCY) and methylmalonic acid (MMA) concentrations in cobalamin-deficient Shar-Peis and dogs of six other breeds. Serum samples (n=297) from cobalamin-deficient dogs (Shar-Peis, German Shepherd dogs, Labrador Retrievers, Yorkshire Terriers, Boxers, Cocker Spaniels, and Beagles) were analyzed for serum HCY and MMA concentrations. A Fisher's exact test was used to evaluate if cobalamin deficiency in Shar-Peis is associated with hyperhomocysteinemia. Serum HCY and MMA concentrations were higher in cobalamin-deficient Shar-Peis compared to cobalamin-deficient dogs of the six other breeds (P<0.0001). Hyperhomocysteinemia was associated with cobalamin deficiency in Shar-Peis (P=0.009). In addition, serum HCY and MMA concentrations did not differ between cobalamin-deficient German Shepherd dogs with and without exocrine pancreatic insufficiency (EPI), a potential cause of secondary cobalamin deficiency. These findings suggest that the function of the two intracellular cobalamin-dependent enzymes is impaired in Shar-Peis with cobalamin deficiency.

published proceedings

  • Vet J

altmetric score

  • 3

author list (cited authors)

  • Grtzner, N., Heilmann, R. M., Stupka, K. C., Rangachari, V. R., Weber, K., Holzenburg, A., Suchodolski, J. S., & Steiner, J. M.

citation count

  • 18

complete list of authors

  • Grützner, Niels||Heilmann, Romy M||Stupka, Kenneth C||Rangachari, Venkat R||Weber, Katja||Holzenburg, Andreas||Suchodolski, Jan S||Steiner, Jörg M

publication date

  • August 2013