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Gene Review

GLB1  -  galactosidase, beta 1

Canis lupus familiaris

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Disease relevance of GLB1

  • GM(1)-gangliosidosis is a lysosomal storage disease that is inherited as an autosomal recessive disorder, predominantly caused by structural defects in the beta-galactosidase gene (GLB1) [1].
  • During periods of control, hypoxia, and after discontinuation of the venoarterial admixture (recovery), effluent perfusate was collected and mucosal biopsies were obtained for assay of lactase, maltase and sucrase activity, mucosal ATPase activity and ATP content, and for light- and electron microscopic examination [2].

High impact information on GLB1

  • Specific and total activities of proximal jejunal brush border lactase, sucrase, and alkaline phosphatase were significantly greater in suckled vs formula-fed animals at 120 h [3].
  • In the transcript containing exon 15 with the 19-bp duplication a premature termination codon (PTC) appeared, but due to its localization in the last exon of canine GLB1, nonsense-mediated RNA decay (NMD) did not occur [1].
  • Activities of lactase, sucrase, 4 peptidases, and enteropeptidase were assayed in samples of mucosa obtained from 3 regions of the small intestine [4].
  • The activities of lysosomal acid beta-galactosidase in its leucocytes and liver were less than 2 per cent of the control levels, and the compound accumulated in the brain was identified as GM1 ganglioside [5].
  • Tissues were analyzed for morphology with quantitative morphometry, mucosal disaccharidase activities (sucrase, maltase, and lactase), and tissue content of selected regulatory peptides in transmural, mucosa/submucosa, and muscularis regions [6].

Anatomical context of GLB1

  • Also the concentration of lactase, maltase, sucrase, and alkaline phosphatase in mucosal biopsies from the second part of the duodenum was significantly reduced (p less than 0.001) [7].

Analytical, diagnostic and therapeutic context of GLB1

  • However, anticipated increases in activities of maltase and sucrase were not observed following duct ligation, and there was a reduction in lactase activity which was reversed by pancreatic supplementation [8].
  • 1. Dog liver acid beta-galactosidase was isolated in high yield and purified to homogeneity using a series of chromatographies on Con A-Sepharose, decyl-agarose, anion-exchange HPLC and gel-filtration HPLC [9].


  1. A duplication in the canine beta-galactosidase gene GLB1 causes exon skipping and GM1-gangliosidosis in Alaskan huskies. Kreutzer, R., Leeb, T., Müller, G., Moritz, A., Baumgärtner, W. Genetics (2005) [Pubmed]
  2. Effects of nonischemic hypoxia on jejunal mucosal structure and function: study of an experimental model in dogs. Berant, M., Alon, U., Antebi, D., Diamond, E., Koerner, H., Mordechovitz, D. Pediatr. Res. (1986) [Pubmed]
  3. Effects of feeding on the small intestinal mucosa of beagle pups during the first 5 d of life. Schwarz, S.M., Heird, W.C. Am. J. Clin. Nutr. (1994) [Pubmed]
  4. Activities of gastric, pancreatic, and intestinal brush-border membrane enzymes during postnatal development of dogs. Buddington, R.K., Elnif, J., Malo, C., Donahoo, J.B. Am. J. Vet. Res. (2003) [Pubmed]
  5. GM1 gangliosidosis in shiba dogs. Yamato, O., Ochiai, K., Masuoka, Y., Hayashida, E., Tajima, M., Omae, S., Iijima, M., Umemura, T., Maede, Y. Vet. Rec. (2000) [Pubmed]
  6. Neural isolation of the jejunoileum. Effect on tissue morphometry, mucosal disaccharidase activity, and tissue peptide content. Sarr, M.G., Siadati, M.R., Bailey, J., Lucas, D.L., Roddy, D.R., Duenes, J.A. J. Surg. Res. (1996) [Pubmed]
  7. Effect of gastric hypersecretion on the canine duodenum. Henricksen, F.W., Gammeltoft, M., Rune, S.J. Scand. J. Gastroenterol. (1976) [Pubmed]
  8. Biochemical changes in the jejunal mucosa of dogs with exocrine pancreatic insufficiency following pancreatic duct ligation. Simpson, K.W., Morton, D.B., Sørensen, S.H., McLean, L., Riley, J.E., Batt, R.M. Res. Vet. Sci. (1989) [Pubmed]
  9. Purification and immunological characterization of acid beta-galactosidase from dog liver. Hotamisligil, S., Hale, S., Alroy, J., Fischer, I., Raghavan, S. Comp. Biochem. Physiol., B (1993) [Pubmed]
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