Crossref journal-article
Proceedings of the National Academy of Sciences
Proceedings of the National Academy of Sciences (341)
Abstract

Control of cell identity during development is specified in large part by the unique expression patterns of multiple homeobox-containing ( Hox ) genes in specific segments of an embryo. Trithorax and Polycomb-group (Trx-G and Pc-G) proteins in Drosophila maintain Hox expression or repression, respectively. Mixed lineage leukemia (MLL) is frequently involved in chromosomal translocations associated with acute leukemia and is the one established mammalian homologue of Trx . Bmi-1 was first identified as a collaborator in c-myc -induced murine lymphomagenesis and is homologous to the Drosophila Pc-G member Posterior sex combs . Here, we note the axial-skeletal transformations and altered Hox expression patterns of Mll -deficient and Bmi-1 -deficient mice were normalized when both Mll and Bmi-1 were deleted, demonstrating their antagonistic role in determining segmental identity. Embryonic fibroblasts from Mll -deficient compared with Bmi-1 -deficient mice demonstrate reciprocal regulation of Hox genes as well as an integrated Hoxc8 -lacZ reporter construct. Reexpression of MLL was able to overcome repression, rescuing expression of Hoxc8 -lacZ in Mll -deficient cells. Consistent with this, MLL and BMI-I display discrete subnuclear colocalization. Although Drosophila Pc-G and Trx-G members have been shown to maintain a previously established transcriptional pattern, we demonstrate that MLL can also dynamically regulate a target Hox gene.

Bibliography

Hanson, R. D., Hess, J. L., Yu, B. D., Ernst, P., van Lohuizen, M., Berns, A., van der Lugt, N. M. T., Shashikant, C. S., Ruddle, F. H., Seto, M., & Korsmeyer, S. J. (1999). Mammalian Trithorax and Polycomb -group homologues are antagonistic regulators of homeotic development. Proceedings of the National Academy of Sciences, 96(25), 14372–14377.

Authors 11
  1. Robin D. Hanson (first)
  2. Jay L. Hess (additional)
  3. Benjamin D. Yu (additional)
  4. Patricia Ernst (additional)
  5. Maarten van Lohuizen (additional)
  6. Anton Berns (additional)
  7. Nathalie M. T. van der Lugt (additional)
  8. Cooduvalli S. Shashikant (additional)
  9. Frank H. Ruddle (additional)
  10. Masao Seto (additional)
  11. Stanley J. Korsmeyer (additional)
Dates
Type When
Created 23 years, 1 month ago (July 26, 2002, 10:39 a.m.)
Deposited 3 years, 4 months ago (April 13, 2022, 4:21 p.m.)
Indexed 1 week, 4 days ago (Aug. 21, 2025, 1:37 p.m.)
Issued 25 years, 8 months ago (Dec. 7, 1999)
Published 25 years, 8 months ago (Dec. 7, 1999)
Published Online 25 years, 8 months ago (Dec. 7, 1999)
Published Print 25 years, 8 months ago (Dec. 7, 1999)
Funders 0

None

@article{Hanson_1999, title={Mammalian Trithorax and Polycomb -group homologues are antagonistic regulators of homeotic development}, volume={96}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.96.25.14372}, DOI={10.1073/pnas.96.25.14372}, number={25}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Hanson, Robin D. and Hess, Jay L. and Yu, Benjamin D. and Ernst, Patricia and van Lohuizen, Maarten and Berns, Anton and van der Lugt, Nathalie M. T. and Shashikant, Cooduvalli S. and Ruddle, Frank H. and Seto, Masao and Korsmeyer, Stanley J.}, year={1999}, month=dec, pages={14372–14377} }