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Mol. Cell. Biol., 10 1995, 5434-5443, Vol 15, No. 10
JJ Moskow, F Bullrich, K Huebner, IO Daar and AM Buchberg
Leukemia results from the accumulation of multiple genetic alterations that
disrupt the control mechanisms of normal growth and differentiation. The
use of inbred mouse strains that develop leukemia has greatly facilitated
the identification of genes that contribute to the neoplastic
transformation of hematopoietic cells. BXH-2 mice develop myeloid leukemia
as a result of the expression of an ecotropic murine leukemia virus that
acts as an insertional mutagen to alter the expression of cellular
proto-oncogenes. We report the isolation of a new locus, Meis1, that serves
as a site of viral integration in 15% of the tumors arising in BXH-2 mice.
Meis1 was mapped to a distinct location on proximal mouse chromosome 11,
suggesting that it represents a novel locus. Analysis of somatic cell
hybrids segregating human chromosomes allowed localization of MEIS1 to
human chromosome 2p23-p12, in a region known to contain translocations
found in human leukemias. Northern (RNA) blot analysis demonstrated that a
Meis1 probe detected a 3.8-kb mRNA present in all BXH-2 tumors, whereas
tumors containing integrations at the Meis1 locus expressed an additional
truncated transcript. A Meis1 cDNA clone that encoded a novel member of the
homeobox gene family was identified. The homeodomain of Meis1 is most
closely related to those of the PBX/exd family of homeobox protein-
encoding genes, suggesting that Meis1 functions in a similar fashion by
cooperative binding to a distinct subset of HOX proteins. Collectively,
these results indicate that altered expression of the homeobox gene Meis1
may be one of the events that lead to tumor formation in BXH-2 mice.
Copyright © 1995, American Society for Microbiology
Meis1, a PBX1-related homeobox gene involved in myeloid leukemia in BXH- 2 mice
Jefferson Cancer Center, Jefferson Medical College, Philadelphia, Pennsylvania 19107, USA.
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