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Identification of a novel cDNA clone encoding protein tyrosine kinase in murine skin
Y Kawachi1, H Nakauchi, F Otsuka
1Department of Dermatology, University of Tsukuba, Japan.
Abstract:
Tyrosine phosphorylation is widely recognized as playing important roles in cell differentiation, proliferation, and carcinogenesis. We have used the polymerase chain reaction (PCR) method to identify protein tyrosine kinases that are expressed in the skin. Mixed oligonucleotide probes were used to amplify and screen a neonatal murine skin cDNA pool for clones encoding amino acid contiguities whose conservation is characteristic of the protein tyrosine kinase family. When the PCR products were sequenced, 13 distinct clones were found, of which one is novel to date and has provisionally been named tks (for tyrosine kinase identified from skin). Sequence homology comparison showed that the tks gene is homologous to the src and fes/fps families. Northern blotting using PCR products of tks as a probe revealed that the mRNA of tks is detected ubiquitously and weakly in other tissues such as brain, lung, liver, thymus and kidney. This fact suggests that the tks gene is expressed in widely distributed cell types.
Insights
Researchers identified a novel protein tyrosine kinase, TKS, in mouse skin using PCR. This kinase is expressed broadly across various tissues, suggesting a widespread role in cellular functions.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Protein tyrosine kinases (PTKs) are crucial regulators of cellular processes including differentiation, proliferation, and cancer.
- Identifying novel PTKs can elucidate new pathways involved in skin biology and disease.
Purpose of the Study:
- To identify protein tyrosine kinases expressed in neonatal murine skin.
- To characterize a newly identified tyrosine kinase gene, provisionally named tks.
Main Methods:
- Polymerase chain reaction (PCR) was employed to screen a neonatal murine skin cDNA library.
- Mixed oligonucleotide probes were used for amplification and screening of PTK family members.
- Sequencing of PCR products identified distinct clones, including a novel one.
- Northern blotting was performed to determine the expression pattern of the tks gene.
Main Results:
- Thirteen distinct protein tyrosine kinase clones were identified from the murine skin cDNA pool.
- A novel tyrosine kinase gene, designated tks (tyrosine kinase identified from skin), was discovered.
- Sequence homology analysis revealed that tks is related to the src and fes/fps kinase families.
- Northern blot analysis indicated ubiquitous but weak expression of tks mRNA in various tissues, including brain, lung, liver, thymus, and kidney.
Conclusions:
- The tks gene is expressed in a wide range of cell types beyond the skin.
- The discovery of tks provides a new target for investigating tyrosine kinase signaling in diverse biological contexts.