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Human ltk: gene structure and preferential expression in human leukemic cells
1Third Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Japan.
Oncogene Research
|January 1, 1990
Summary
Researchers identified the human tyrosine kinase gene (hltk) in leukemia. This gene, hltk, was preferentially expressed in leukemia cases but not in other cancers, suggesting its potential role in leukemia development.
Area of Science:
- Molecular Biology
- Genetics
- Oncology
Background:
- The murine tyrosine kinase gene ltk plays a role in cellular signaling.
- Understanding human homologs of oncogenes is crucial for cancer research.
Purpose of the Study:
- To isolate and characterize the human homolog of the murine tyrosine kinase gene ltk.
- To investigate the expression pattern of the human homolog (hltk) in various human malignancies.
Main Methods:
- Isolation of human homolog (hltk) using a K-562 human leukemia cDNA library.
- Deduction of protein sequence and comparison with murine ltk.
- Northern blot analysis to assess hltk gene expression in 35 human malignancies and 17 nonleukemic neoplasms.
Main Results:
- The human homolog, hltk, was successfully isolated.
- hltk protein sequence exhibits differences in the juxtamembrane domain and carboxy terminus compared to murine ltk.
- hltk showed preferential expression in 10 out of 18 leukemia cases, with no cell lineage specificity.
- hltk gene was not expressed in any of the 17 nonleukemic neoplasms analyzed.
Conclusions:
- The human homolog of ltk, hltk, is identified.
- hltk is preferentially expressed in human leukemias, indicating a potential role in leukemia pathogenesis.
- The genetic linkage of hltk to c-ros suggests evolutionary relationships.