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Complementary DNA cloning and characterization of truncated form of c-kit in human colon carcinoma cells
1Department of Internal Medicine (Section 1), Sapporo Medical University School of Medicine, Japan.
Abstract:
We have obtained a novel c-kit complementary DNA (cDNA) from a colon carcinoma cell line, Colo201, and characterized its structure. The size of the transcript in Colo201 was approximately 3.5 kilobases and it hybridized to the c-kit cDNA fragments encompassing the kinase domain, but not to the cDNA fragments encoding extracellular and transmembrane domains. The predicted protein encoded by those cDNAs was composed of 257 amino acids containing the NH2-terminal 25 unique amino acids in frame by the COOH terminal of the KIT protein. Of interest, these 25 amino acids were encoded by intron 15 of the c-kit gene. The aberrant mRNA was also detected in another colon carcinoma cell line, BM314. The translation of this message in Colo201 was confirmed by flow cytometry and immunoblot analysis. This is the first report describing the aberrant transcript of c-kit in human tumor cells, and it is suggested that truncated form of c-kit might play a role in the onset and development of human colon carcinoma.
Insights
Researchers discovered a novel, truncated c-kit messenger RNA (mRNA) in colon carcinoma cells. This aberrant c-kit transcript, potentially driving colon cancer development, was confirmed via flow cytometry and immunoblot analysis.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- The c-kit proto-oncogene encodes a receptor tyrosine kinase crucial for cell growth and differentiation.
- Aberrant c-kit signaling is implicated in various human cancers.
- The presence and role of c-kit alterations in colon carcinoma remain incompletely understood.
Purpose of the Study:
- To identify and characterize novel c-kit complementary DNA (cDNA) variants in colon carcinoma cell lines.
- To investigate the structural and functional implications of any identified c-kit alterations.
- To explore the potential role of aberrant c-kit in colon cancer pathogenesis.
Main Methods:
- Isolation and characterization of c-kit cDNA from the Colo201 colon carcinoma cell line.
- Hybridization studies using c-kit cDNA fragments to map the aberrant transcript.
- Bioinformatic analysis to predict the encoded protein sequence.
- Confirmation of aberrant mRNA translation using flow cytometry and immunoblot analysis.
Main Results:
- A novel, aberrant c-kit transcript of approximately 3.5 kilobases was identified in Colo201 cells.
- This transcript encoded a truncated KIT protein (257 amino acids) resulting from the inclusion of 25 unique amino acids from intron 15.
- The aberrant mRNA was also detected in the BM314 colon carcinoma cell line.
- Translation of the aberrant mRNA was confirmed in Colo201 cells.
Conclusions:
- This study reports the first description of an aberrant c-kit transcript in human tumor cells.
- The identified truncated KIT protein may play a significant role in the initiation and progression of human colon carcinoma.
- Further investigation into the functional consequences of this aberrant c-kit form is warranted.