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An expression profile of active genes in human colonic mucosa
K Okubo1, J Yoshii, H Yokouchi
1Institute for Molecular and Cellular Biology, Osaka University, Japan.
Abstract:
An expression profile of genes active in the human colonic mucosa was obtained by collecting 959 partial sequences from a 3'-directed cDNA library. Seven genes were found to produce mRNA each of which comprised more than 1% of total mRNA. Four of these genes are novel, and are likely to be uniquely expressed in the colonic mucosa, and the other three have been identified as genes for fatty acid binding protein, immunoglobulin lambda chain, and carcinoma-associated antigen GA733-2. In the remaining 952 clones, 310 were composed of 118 species occurred recurrently but less than 1%, and 533 clones appeared only once. Because the 3'-directed cDNA library faithfully represents the mRNA population in the source tissue, these numbers represent the relative activities of the gene expression. Altogether 156 gene species were identified in GenBank, and a significant portion of these genes encode proteins found in Golgi apparatus and lysosomes, chromosome-encoded mitochondrial proteins, cell surface proteins, and components in the protein synthesis machinery. The types and proportions of genes identified is consistent with the known major activities of the colonic mucosa such as mucous protein production, energy-dependent water absorption, and rapid cell proliferation and turnover.
Insights
This study profiles gene expression in human colonic mucosa, identifying novel genes and known ones like fatty acid binding protein. The findings align with the colon
Area of Science:
- Molecular Biology
- Genomics
- Human Physiology
Background:
- Understanding gene expression in human colonic mucosa is crucial for comprehending its physiological functions.
- A 3'-directed cDNA library was constructed to capture the mRNA population of the colonic mucosa.
Observation:
- Analysis of 959 cDNA sequences revealed the relative abundance of various gene transcripts.
- Seven genes constituted over 1% of the total mRNA, including novel candidates and known genes.
Findings:
- Four novel genes were identified, potentially specific to the colonic mucosa.
- Identified genes include those for fatty acid binding protein, immunoglobulin lambda chain, and GA733-2.
- The majority of identified genes encode proteins involved in cellular functions like Golgi apparatus, lysosomes, and protein synthesis.
Implications:
- The gene expression profile reflects the colonic mucosa's key activities: mucous production, water absorption, and cell turnover.
- This data provides a foundation for further research into colonic mucosal biology and disease.
- The identified novel genes may serve as biomarkers or therapeutic targets for colonic conditions.