Rapid identification of mutations in the IDS gene of Hunter patients: Analysis of mRNA by the protein truncation test
- and others
Hunter syndrome is an X-linked recessive disorder constituting phenotypes ranging from mild to severe. The gene affected in Hunter syndrome is iduronate-2-sulfatase (IDS). The identification of mutations leading to a defective enzyme could be of benefit for the diagnosis and prognosis of patients. At this moment a variety of mutations have been found, including large deletions and base substitutions. We have previously described a method, designated the protein truncation test (PTT), for the detection of mutations leading to premature translation termination. The method combines reverse transcription and PCR (RT-PCR) with in vitro transcript/translation of the products generated. To facilitate a PTT analysis, the forward primer is modified by addition of a T7 promoter sequence and an in-frame protein translation initiation sequence. In our department the method has been successfully applied for DMD and FAP. Here we report on the PTT analysis of 8 Hunter patients, all of them without major gene alterations as determined by Southern analysis. Total RNA was isolated from cultured skin fibroblasts or peripheral blood lymphocytes. PTT analysis revealed 4 novel mutations in the IDS gene: two missense mutations and two frameshift mutations (splice donor site alteration in intron 6 and a 13 bp deletion in exon 9). Furthermore, PTT proved to be a simple method to identify carriers. Currently, we use the generated RT-PCR products of the remaining patients for automated sequence analysis. PTT may be of great value in screening disorders in which affected genes give rise to truncated protein products.
- OSTI ID:
- 134225
- Report Number(s):
- CONF-941009-; ISSN 0002-9297; TRN: 95:005313-0961
- Journal Information:
- American Journal of Human Genetics, Vol. 55, Issue Suppl.3; Conference: 44. annual meeting of the American Society of Human Genetics, Montreal (Canada), 18-22 Oct 1994; Other Information: PBD: Sep 1994
- Country of Publication:
- United States
- Language:
- English
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