MLL-SEPTIN6 fusion recurs in novel translocation of chromosomes 3, X, and 11 in infant acute myelomonocytic leukaemia and in t(X;11) in infant acute myeloid leukaemia, and MLL genomic breakpoint in complex MLL-SEPTIN6 rearrangement is a DNA topoisomerase II cleavage site.

Slater DJ, Hilgenfeld E, Rappaport EF, Shah N, Meek RG, Williams WR, Lovett BD, Osheroff N, Autar RS, Ried T, Felix CA
Oncogene. 2002 21 (30): 4706-14

PMID: 12096348 · DOI:10.1038/sj.onc.1205572

We examined the MLL translocation in two cases of infant AML with X chromosome disruption. The G-banded karyotype in the first case suggested t(X;3)(q22;p21)ins(X;11)(q22;q13q25). Southern blot analysis showed one MLL rearrangement. Panhandle PCR approaches were used to identify the MLL fusion transcript and MLL genomic breakpoint junction. SEPTIN6 from chromosome band Xq24 was the partner gene of MLL. MLL exon 7 was joined in-frame to SEPTIN6 exon 2 in the fusion transcript. The MLL genomic breakpoint was in intron 7; the SEPTIN6 genomic breakpoint was in intron 1. Spectral karyotyping revealed a complex rearrangement disrupting band 11q23. FISH with a probe for MLL confirmed MLL involvement and showed that the MLL-SEPTIN6 junction was on the der(X). The MLL genomic breakpoint was a functional DNA topoisomerase II cleavage site in an in vitro assay. In the second case, the karyotype revealed t(X;11)(q22;q23). Southern blot analysis showed two MLL rearrangements. cDNA panhandle PCR detected a transcript fusing MLL exon 8 in-frame to SEPTIN6 exon 2. MLL and SEPTIN6 are vulnerable to damage to form recurrent translocations in infant AML. Identification of SEPTIN6 and the SEPTIN family members hCDCrel and MSF as partner genes of MLL suggests a common pathway to leukaemogenesis.

MeSH Terms (23)

Acute Disease Base Sequence Chromosome Breakage Chromosome Mapping Chromosomes, Human, Pair 3 Chromosomes, Human, Pair 11 Cytoskeletal Proteins DNA-Binding Proteins DNA Topoisomerases, Type II GTP-Binding Proteins Histone-Lysine N-Methyltransferase Humans Infant In Situ Hybridization, Fluorescence Leukemia, Myeloid Leukemia, Myelomonocytic, Acute Molecular Sequence Data Myeloid-Lymphoid Leukemia Protein Proto-Oncogenes Septins Transcription Factors Translocation, Genetic X Chromosome

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