TheCDCREL1 gene fused toMLL in de novo acute myeloid leukemia with t(11;22)(q23;q11.2) and its frequent expression in myeloid leukemia cell lines

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We report on an adult patient with de novo acute myeloid leukemia (AML) with a t(11;22)(q23;q11.2) involving CDCREL1 and MLL genes. Reverse transcriptase (RT)-polymerase chain reaction (PCR) followed by direct sequencing analysis revealed the MLL-CDCREL1 fusion transcript in his leukemic cells. Analysis of the fusion transcript showed that exon 6 of MLL was fused to exon 4 of CDCREL1, which contains an AT-hook domain of MLL and a GTP binding domain of CDCREL1. To investigate the roles of CDCREL1 further, we examined the expression of the CDCREL1 gene in various cell lines. Expression of CDCREL1 was detected in 11 (85%) of 13 AML cell lines and 3 (21%) of 14 acute lymphoblastic leukemia (ALL) cell lines, but none of 11 EB virus transformed B-cell lines by RT-PCR. The expression rate of CDCREL1 was significantly higher in AML cell lines than in ALL cell lines (P = 0.0035). Platelet glycoprotein 1B beta (GP1B beta), which is located downstream of CDCREL1 and is cotranscribed with CDCREL1 due to a nonconsensus polyadenylation sequence, was expressed in all these cell lines. The higher expression rate of CDCREL1 in AML cell lines than in ALL cell lines suggests that this gene may play some role in myeloid leukemogenesis.

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