PMID- 11280916 OWN - NLM STAT- MEDLINE DCOM- 20010517 LR - 20071115 IS - 0485-1439 (Print) IS - 0485-1439 (Linking) VI - 42 IP - 2 DP - 2001 Feb TI - [Complex translocation (8;15;21) (q22;p12;q22) in a child with AML-M2 showing de novo appearance of the short form of AML1-MTG8 chimeric mRNA during the course]. PG - 110-4 AB - A 4-year-old boy admitted with exophthalmos was diagnosed as having acute myeloblastic leukemia with maturation (AML-M2). Chromosomal analysis (G-banding) showed t(8;15;21). Fluorescence in situ hybridization (FISH), reverse transcriptase-polymerase chain reaction (RT-PCR), spectral karyotyping (SKY), and nucleolar organizer region (NOR) staining suggested that this complex translocation might have resulted from stepwise translocation, namely an initial translocation between chromosomes 8 and 21, followed by a second translocation between der(21) and chromosome 15, rather than the other possibility of clockwise translocation. During chemotherapy, RT-PCR demonstrated the short form of AML1-MTG8 mRNA, in addition to chimeric mRNA of the usual length. Sequence analysis revealed that this shorter chimeric mRNA had resulted from deletion of a 250-bp sequence at the 5' end of MTG8. A literature search failed to reveal any similar cases of t(8;21) AML-M2 associated with this deletion of chimeric mRNA. FAU - Watanabe, A AU - Watanabe A AD - Department of Pediatrics, Ibaragi Children's Hospital. FAU - Koike, K AU - Koike K FAU - Fukushima, T AU - Fukushima T FAU - Izumi, I AU - Izumi I FAU - Ohba, K AU - Ohba K FAU - Tsuchida, M AU - Tsuchida M LA - jpn PT - Case Reports PT - English Abstract PT - Journal Article PL - Japan TA - Rinsho Ketsueki JT - [Rinsho ketsueki] The Japanese journal of clinical hematology JID - 2984782R RN - 0 (RNA, Messenger) SB - IM MH - Base Sequence MH - Child, Preschool MH - Chromosomes, Human, Pair 15/*genetics MH - Chromosomes, Human, Pair 21/*genetics MH - Chromosomes, Human, Pair 8/*genetics MH - Humans MH - Leukemia, Myeloid, Acute/*genetics MH - Male MH - RNA, Messenger/*genetics MH - *Translocation, Genetic EDAT- 2001/04/03 10:00 MHDA- 2001/05/18 10:01 CRDT- 2001/04/03 10:00 PHST- 2001/04/03 10:00 [pubmed] PHST- 2001/05/18 10:01 [medline] PHST- 2001/04/03 10:00 [entrez] PST - ppublish SO - Rinsho Ketsueki. 2001 Feb;42(2):110-4.