NCIt definition : Human SI wild-type allele is located in the vicinity of 3q26.1 and is approximately
179 kb in length. This allele, which encodes sucrase-isomaltase, intestinal protein,
is involved in carbohydrate digestion. Loss of function mutations in the gene are
associated with congenital sucrase-isomaltase deficiency.;
NCIt note : There is a high degree of homology between the portions of the gene encoding isomaltase
and sucrase (41% of amino acid identity); thus, this gene may have evolved by partial
gene duplication. (UniProt);