The function of ENSG00000171298 (GAA, alpha glucosidase) is as follows. Essential for the degradation of glycogen in lysosomes (PubMed:14695532, PubMed:18429042, PubMed:1856189, PubMed:7717400). Has highest activity on alpha-1,4-linked glycosidic linkages, but can also hydrolyze alpha-1,6-linked glucans (PubMed:29061980). {ECO:0000269|PubMed:14695532, ECO:0000269|PubMed:18429042, ECO:0000269|PubMed:1856189, ECO:0000269|PubMed:29061980, ECO:0000269|PubMed:7717400}.