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Physical characterization of deoxyribonucleic acids of different human papilloma viruses (HPV)
Abstract:
Different types of human papilloma viruses (HPV) had been identified by the use of bacterial restriction endonucleases (Gissmann et al., 1977). The DNAs of HPV 1, 2, and 3 showing a similar restriction enzyme pattern can be purified in sufficient quantities to permit further characterization. These viruses appear not to be identical, as far as molecular weight (4.9 X 10(6) d), buoyant density (1.700 mu/ml), and sedimentation values of the different DNA components (Co I: 22--23S; Co II: 17S; Co III: 16S) are concerned. HPV 4 DNA, which is entirely different from HPV 1--3 in its restriction enzyme pattern, does not hybridize with cRNA transcribed in vitro from HPV 1 DNA. The cRNA was shown to represent the whole viral genome.
Insights
Bacterial restriction endonucleases helped identify human papilloma viruses (HPV). HPV 1, 2, and 3 DNAs have similar patterns but differ in physical characteristics, while HPV 4 DNA is distinct and does not hybridize with HPV 1.
Area of Science:
- Virology
- Molecular Biology
- Biochemistry
Background:
- Human papilloma viruses (HPV) are common viruses with diverse types.
- Bacterial restriction endonucleases are crucial tools for DNA analysis.
Purpose of the Study:
- To characterize and differentiate various types of HPV DNA.
- To investigate the molecular distinctions between HPV types 1, 2, 3, and 4.
Main Methods:
- Utilizing bacterial restriction endonucleases to analyze viral DNA.
- Purification of HPV DNA for detailed characterization.
- Determining molecular weight, buoyant density, and sedimentation values of viral DNA components.
- In vitro transcription of viral DNA to produce complementary RNA (cRNA).
- Hybridization assays to assess DNA sequence homology.
Main Results:
- HPV types 1, 2, and 3 exhibited similar restriction enzyme patterns.
- Despite similar patterns, HPV 1, 2, and 3 DNAs showed variations in molecular weight, buoyant density, and sedimentation coefficients.
- HPV 4 DNA displayed a distinct restriction enzyme pattern compared to HPV 1-3.
- cRNA transcribed from HPV 1 DNA did not hybridize with HPV 4 DNA, indicating significant sequence divergence.
Conclusions:
- Bacterial restriction endonucleases effectively differentiate HPV types.
- HPV 1, 2, and 3 are distinct viral entities despite shared restriction patterns.
- HPV 4 represents a genetically different type of human papilloma virus compared to HPV 1.