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  • Title: Clinical and biochemical signs in Fleckvieh cattle with genetically confirmed Fanconi-Bickel syndrome (cattle homozygous for Fleckvieh haplotype 2).
    Author: Burgstaller J, Url A, Pausch H, Schwarzenbacher H, Egerbacher M, Wittek T.
    Journal: Berl Munch Tierarztl Wochenschr; 2016; 129(3-4):132-7. PubMed ID: 27169150.
    Abstract:
    Fanconi-Bickel Syndrome (FBS) is an autosomal recessive disorder of the carbohydrate metabolism, which has been reported in human and some animals (OMIA 000366-9913). In Fleckvieh cattle it is caused by mutations in SLC2A2, a gene encoding for glucose transporter protein 2 (GLUT2), which is primarily expressed in liver, kidney, pancreas and intestines. The causal mutation resides in a previously reported Fleckvieh Haplotype 2 (FH-2). FH-2 homozygous individuals are rare, but due to widespread use of heterozygous bulls in artificial insemination, heterozygous animals are likely to be present in a larger number in the cattle population. Two clinical cases of Fleckvieh cattle with a syndrome resembling the phenotypic appearance of FBS are presented in the present study describing the association between the clinical manifestations of FBS and the postulated frameshift mutation in bovine SLC2A2. Clinical examination showed poor growth, retarded development, polyuria, and polydipsia. Laboratory analyses showed an increased plasma glucose but normal insulin concentration and increased renal glucose excretion. Histopathological examination of kidney and liver samples revealed massively increased liver glycogen storage and nephrosis. Sires of both cases were tested positive for being heterozygous carriers for the same frameshift mutation in SLC2A2 as was originally reported in Fleckvieh cattle. DNA of both cases described was analyzed and Sanger sequencing confirmed homozygosity for the frameshift mutation in SLC2A2.
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