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Characterization of clones for the sixth (L) gene and a transcriptional map for morbilliviruses
Abstract:
cDNA clones of the largest RNA transcript of the canine distemper and measles morbilliviruses were characterized. This presumably codes for the L protein of these viruses. mRNA 4 was identified as coding for the haemagglutinin protein of measles virus. From an analysis of readthrough transcripts representing tandem copies of two or three genes we established a transcriptional map and the gene order on the negative strand genome of the morbilliviruses to be 3'-N-P + C-M-F-H-L-5'. The data exclude the presence of small intervening genes between the six major genes of morbilliviruses and indicate the gene order to be similar to that of Sendai virus and different from that of simian virus 5.
Insights
Researchers mapped the gene order of morbilliviruses, revealing a conserved 3’-N-P+C-M-F-H-L-5’ sequence. This finding clarifies the genome structure for canine distemper and measles viruses.
Area of Science:
- Virology
- Molecular Biology
- Genomics
Background:
- Canine distemper virus (CDV) and measles virus (MeV) are significant morbilliviruses.
- Understanding their genome organization is crucial for antiviral strategies.
Purpose of the Study:
- To characterize cDNA clones of the largest RNA transcripts of CDV and MeV.
- To establish a transcriptional map and determine the gene order of morbilliviruses.
Main Methods:
- Characterization of cDNA clones from CDV and MeV.
- Analysis of readthrough transcripts to identify gene order.
- Comparison with other paramyxoviruses.
Main Results:
- Identified the L protein from the largest RNA transcript.
- Confirmed mRNA 4 codes for the measles virus haemagglutinin protein.
- Established the morbillivirus gene order as 3'-N-P+C-M-F-H-L-5' on the negative strand genome.
Conclusions:
- The gene order of morbilliviruses is conserved and similar to Sendai virus.
- Data excludes small intervening genes between major morbillivirus genes.
- This provides a foundational map for morbillivirus research and therapeutic development.