Mapping of chromosome 20 for loss of heterozygosity in childhood ALL reveals a 1000-kb deletion in one patient
| Autor: | Michel Duval, Hélène Cavé, Valérie Bardet, Bernard Grandchamp, C Chambon-Pautas, N Couque, Etienne Vilmer |
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| Rok vydání: | 1999 |
| Předmět: |
Cancer Research
Myeloid Adolescent Chromosomes Human Pair 20 Loss of Heterozygosity Biology Loss of heterozygosity Myeloproliferative Disorders Acute lymphocytic leukemia Genotype medicine Humans Child Genetics Myelodysplastic syndromes Chromosome Mapping Infant Hematology Precursor Cell Lymphoblastic Leukemia-Lymphoma medicine.disease Molecular biology medicine.anatomical_structure Oncology Genetic marker Child Preschool Chromosome 20 |
| Zdroj: | Leukemia. 13:1972-1974 |
| ISSN: | 1476-5551 0887-6924 |
| Popis: | The long arm of chromosome 20 displays recurrent loss of heterozygosity (LOH) for microsatellite markers in blast cells from children with acute lymphoblastic leukemia. To further characterize the region of deletion and to precisely establish its frequency, we searched for LOH in 103 children with ALL using polymorphic markers in the previously described region of interest, namely between D20S101 and D20S887. LOH was detected in nine patients (ie with a frequency of 8.7%). Interestingly, in one patient, a small deletion was found, flanked proximally by D20S850 and distally by M201, a dinucleotide repeat identified from chromosome 20 sequences. The distance between these two markers is approximately 1000 kb. The occurrence of non-random deletions of the long arm of chromosome 20 has previously been observed in myeloid malignancies (myeloproliferative disorders and myelodysplastic syndromes) in 5-10% of patients. The small deletion in our patient is located within the common region of deletion of myeloproliferative disorders suggesting that a tumor suppressor gene may be the common target of the deletions in various types of hematological malignancies. |
| Databáze: | OpenAIRE |
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