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• W2034792243 abstract "Human alpha-N-acetylgalactosaminidase (alpha-GalNAc; EC 3.2.1.49), the lysosomal glycohydrolase that cleaves alpha-N-acetylgalactosaminyl moieties in glycoconjugates, is encoded by a gene localized to chromosome 22q13----qter. The deficient activity of this enzyme results in Schindler disease, an autosomal recessive disorder characterized by the increased urinary excretion of glycopeptides and oligosaccharides containing alpha-N-acetylgalactosaminyl moieties. Recently, the 3.6-kb full-length alpha-GalNAc cDNA sequence was isolated and found to have remarkable nucleotide and predicted amino acid homology (55.8 and 46.9%, respectively) with the human alpha-galactosidase A (alpha-Gal A) cDNA. To investigate the possible evolutionary relatedness of the two glycosidases, the alpha-GalNAc chromosomal gene was isolated and characterized. Screening of a human genomic DNA cosmid library resulted in the identification of a clone, gAGB-1, with an approximately 35-kb insert that contained the entire alpha-GalNAc gene. A single approximately 15-kb EcoRI fragment of gAGB-1, which contained the complete 3.6-kb cDNA sequence, was digested and the subcloned fragments were sequenced in both orientations. The 13,709-bp alpha-GalNAc gene had nine exons ranging from 95 to 2028 bp and intronic sequences of 304 to 2684 bp. All exon/intron junctions conformed to the GT/AG consensus rule. Analysis of 1.4 kb of 5' flanking sequence revealed three Sp1 and two CAAT-like promoter elements. This region was GC-rich (56%), but no HTF island was identified. The gene contained six Alu-repetitive elements, all in the reverse orientation. Comparison of the structural organization of the alpha-GalNAc and the alpha-Gal A genes revealed that all six alpha-Gal A introns were identically positioned in the homologous alpha-GalNAc exonic sequence. Two additional introns, 1 and 8, were identfied in the alpha-GalNAc gene. The predicted amino acid sequences of alpha-GalNAc exons 2 through 7 and those of corresponding alpha-Gal A exons 1 through 6 were 46.2 to 62.7% identical. In contrast, there was little, if any, similarity between the deduced amino acid sequences of alpha-Gal A exon 7 and alpha-GalNAc exons 8 and 9. The remarkable amino acid identity and the identical exonic interruption by six introns of the alpha-GalNAc and alpha-Gal A genes suggest that this region in both genes is evolutionarily related and arose through duplication and divergence from a common ancestral gene." @default.
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• W2034792243 date "1991-05-01" @default.
• W2034792243 modified "2023-10-13" @default.
• W2034792243 title "Structural organization and complete sequence of the human α-N-acetylgalactosaminidase gene: Homology with the α-galactosidase A gene provides evidence for evolution from a common ancestral gene" @default.
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• W2034792243 doi "https://doi.org/10.1016/0888-7543(91)90493-x" @default.
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