Abstract:
BACKGROUND:The thiopurine S:-methyltransferase (TPMT) genetic polymorphism has a significant clinical impact on the toxicity of thiopurine drugs, which are used in the treatment of leukemia and as immunosuppressants. To date, 10 mutant alleles are known that are associated with intermediate or low TPMT activity. To facilitate rapid screening of clinically relevant TPMT mutations, we developed a strategy of high-throughput genotyping by applying denaturing HPLC (DHPLC). METHODS:To test the specificity and efficiency of the DHPLC method, 98 DNA samples from a selected population of patients receiving thiopurine therapy or with previous thiopurine withdrawal were analyzed for the most frequent mutant TPMT alleles, *2 and *3A, which contain key mutations in exons 5, 7, and 10 to identify clearly different elution profiles. All fragments were examined by direct sequencing. Additionally, to test the sensitivity of DHPLC analysis, genotyping for the *2 and *3A alleles of all 98 DNA samples was performed by PCR-based methods (PCR-restriction fragment polymorphism analysis and allele-specific PCR). RESULTS:The presence of mutations discriminating for alleles *2, *3A, *3C, and *3D, as well as various silent and intron mutations, were correctly predicted by DHPLC in 100% of the samples as confirmed by direct sequencing. Comparison with PCR-based methods for alleles *2 and *3 produced an agreement of 100% with no false-negative signals. CONCLUSIONS:DHPLC offers a highly sensitive, rapid, and efficient method for genotyping of the relevant TPMT mutations, discriminating at least for alleles *2 and *3, in clinical and laboratory practice. Additionally, DHPLC allows a simultaneous screening for novel genetic variability in the TPMT gene.
journal_name
Clin Chemjournal_title
Clinical chemistryauthors
Schaeffeler E,Lang T,Zanger UM,Eichelbaum M,Schwab Msubject
Has Abstractpub_date
2001-03-01 00:00:00pages
548-55issue
3eissn
0009-9147issn
1530-8561journal_volume
47pub_type
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journal_title:Clinical chemistry
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journal_title:Clinical chemistry
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journal_title:Clinical chemistry
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journal_title:Clinical chemistry
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journal_title:Clinical chemistry
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doi:
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journal_title:Clinical chemistry
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更新日期:1977-09-01 00:00:00
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journal_title:Clinical chemistry
pub_type: 杂志文章
doi:
更新日期:1976-01-01 00:00:00
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journal_title:Clinical chemistry
pub_type: 杂志文章
doi:
更新日期:1975-05-01 00:00:00
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更新日期:1988-05-01 00:00:00
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journal_title:Clinical chemistry
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更新日期:2001-03-01 00:00:00
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journal_title:Clinical chemistry
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更新日期:1986-10-01 00:00:00
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journal_title:Clinical chemistry
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journal_title:Clinical chemistry
pub_type: 杂志文章
doi:
更新日期:1987-06-01 00:00:00
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doi:
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doi:
更新日期:2002-09-01 00:00:00
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更新日期:2001-02-01 00:00:00
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journal_title:Clinical chemistry
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更新日期:2000-04-01 00:00:00
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journal_title:Clinical chemistry
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doi:
更新日期:1978-09-01 00:00:00
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journal_title:Clinical chemistry
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更新日期:1997-10-01 00:00:00
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journal_title:Clinical chemistry
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doi:
更新日期:1984-02-01 00:00:00
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