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MLL amplification in acute myeloid leukemia.
Juan C Pajuelo-Gámez1, José Cervera, Zaida García-Casado
1Servicio de Hematología, Hospital Universitario La Fe, Avenida Campanar 21, Valencia 46009, Spain.
Cancer Genetics and Cytogenetics
|April 25, 2007
Summary
Chromosomal alterations involving the mixed-lineage leukemia (MLL) gene at 11q23 are common in acute leukemia. Molecular techniques like RT-PCR are crucial for detecting MLL partial tandem duplications (MLL-PTD) and associated amplifications.
Area of Science:
- Hematology
- Cancer Genetics
- Molecular Biology
Background:
- Chromosomal alterations at 11q23 involving the mixed-lineage leukemia gene (MLL) are frequent in acute leukemia and linked to poor prognosis.
- Conventional cytogenetics and FISH may not detect all MLL alterations, necessitating molecular methods for accurate diagnosis.
Observation:
- Two acute myeloid leukemia (AML) cases with high-level 11q23 amplification and complex karyotypes were studied.
- FISH, CGH, RT-PCR, and sequencing were used to characterize the 11q23 region and detect MLL alterations.
Findings:
- Partial tandem duplication of the MLL gene (MLL-PTD) was detected in both AML patients.
- Patient 1 also exhibited amplification of the MLL flanking region, suggesting extended alterations.
Implications:
- Molecular methods like RT-PCR and sequencing are essential for detecting MLL alterations, including MLL-PTD.
- MLL locus amplification may involve flanking regions, requiring comprehensive molecular analysis for acute leukemia cases.
