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A cDNA clone encoding a peptide highly specific for hepatitis C infection
T Arima1, C Mori, A Takamizawa
1First Department of Internal Medicine, Okayama University Medical School, Japan.
Insights
Researchers identified a unique DNA clone from hepatitis C (HC) virus-infected patients. This clone, distinct from known human viruses, shows potential as a diagnostic marker for HC infection.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Hepatitis C (HC) is a significant blood-borne infectious disease.
- Identifying the causative agent of non-A, non-B hepatitis (hepatitis C) has been a major challenge.
Purpose of the Study:
- To isolate and characterize cDNA clones encoding antigens associated with hepatitis C infection.
- To identify potential diagnostic markers for hepatitis C virus (HCV).
Main Methods:
- Construction of a lambda gt11-cDNA library from plasma of presumed HC-infected donors.
- Immun screening of the library using pooled serum from HC patients.
- Extensive characterization of a specific cDNA clone, including nucleotide sequencing and immunoblot analysis.
Main Results:
- Twelve cDNA clones associated with HC infection were isolated.
- One 114-nucleotide clone showed high specificity and sensitivity for HC patient serum.
- This clone demonstrated no homology to known human viral sequences, including hepatitis A, B, and D viruses.
Conclusions:
- The isolated cDNA clone is likely derived from the genome of the hepatitis C agent.
- This finding represents a significant step towards identifying the HC virus and developing diagnostic tools.
Abstract:
A random primed lambda gt11-cDNA library was constructed from donors plasma presumably infected by blood-borne non-A, non-B hepatitis (hepatitis C:HC) agent and immunoscreened with serum pooled from patients with acute or chronic HC. Twelve lambda gt11-cDNA clones encoding antigens associated with HC infection in Japan as well as in the USA were isolated. Of these one clone consisting of 114 nucleotides and showing a discrete band on an immunoblot analysis, was extensively studied. The clone is not derived from the host DNA encoding one polypeptide specific and highly sensitive for serum from patients with HC and has no homology to the nucleotide sequences of known human viruses including hepatitis A,B and D viruses, Ebstein-Barr virus, coxsackievirus, immunodeficiency virus type 1 or Japanese encephalitis virus. These results suggest that this clone is derived from the genome of HC agent.