PubMed:2019586 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/2019586","sourcedb":"PubMed","sourceid":"2019586","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/2019586","text":"Sulfatide activator protein. Alternative splicing that generates three mRNAs and a newly found mutation responsible for a clinical disease.\nThe sulfatide activator protein, also known as SAP-1, is derived from a gene that generates an mRNA coding for four homologous proteins. Its physiological function is to stimulate hydrolysis of sulfatide by arylsulfatase A in vivo. A genetic defect in the sulfatide activator results in a metabolic disorder similar to classical metachromatic leukodystrophy, which is itself caused by a genetic defect in arylsulfatase A. In a patient with sulfatide activator deficiency, a nucleotide transversion G722----C (counted from A of the initiation codon ATG) was found in the mRNA of the sulfatide activator precursor, resulting in the substitution of serine for Cys241 in the mature sulfatide activator. The remainder of the coding sequence was completely normal except for a polymorphism C to T in position 1389, which does not change the amino acid sequence. The patient produces at least three different forms of mRNA for the precursor. Two of them include a stretch of an additional 9 and 6 bases, respectively, within the sulfatide activator coding region. In normal individuals this stretch of additional bases has also been observed. This could be explained by the presence of a small 9-base pair exon which can be introduced, or not, by alternative splicing as a stretch of 9 or 6 bases into the mature mRNA. The shortest form of the mRNA yields an active sulfatide activator (Fürst, W., Schubert, J., Machleidt, W., Meier, H. E., and Sandhoff, K. (1990) Eur. J. 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