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[Update on a diagnostic test for choroideremia: the protein truncation test (PTT)]
L Beaufrere1, A Girardet, B Arnaud
1Laboratoire de Biochimie Génétique, CNRS ERS-155, Institut de Biologie, Montpellier, Francè.
Purpose:
The aim of this study was to define the RT-PCR-PTT parameters for CHM gene analysis and to evaluate its interest as a method for CHM mutation screening.
Methods:
The entire CHM coding region was reversed-transcribed in three overlapping cDNA segments (RT-PCR) which were amplified and further analyzed by PTT after in vitro transcription/translation.
Results:
This strategy enabled us to detect a truncated peptide in each of the 6 unrelated patients from southern France who were investigated. The mutation was further characterized by direct sequencing of the RT-PCR product.
Conclusion:
In CHM gene, all conditions are present to make the RT-PCR-PTT strategy the method of choice for mutation screening. As a result of the simplified protocol described in this study, the families of the patients could benefit from accurate carrier-status assessment.