Molecular cloning and comparative sequence analyses of bluetongue virus S1 segments by selective synthesis of specific full-length DNA copies of dsRNA genes

Virology. 1990 Aug;177(2):820-3. doi: 10.1016/0042-6822(90)90557-8.


Using primers complementary to the conserved sequences of the 3' ends of bluetongue virus genomic dsRNA segments, full-length DNA clones of all 10 dsRNA genes from the five U.S. BTV serotypes were synthesized and amplified by a novel method (ClampR). This amounts to nearly 100,000 base pairs of dsRNA cloned as unique full-length DNA copies. This continuous one-tube procedure combined cloning of the denatured dsRNA with reverse transcriptase and the selective amplification of full-length DNA by the polymerase chain reaction. ClampR-derived clones of the genomic segment S1 of BTV-11 encoding the serogroup antigen, VP7, were sequenced and shown to be complete copy, containing a total of 1156 bp and a long open reading frame of 349 amino acids. Comparative sequence analyses of BTV-11 S1 with those of the other U.S. serotypes show that 95.2% of the nucleotides are conserved between BTV-11 and -10, while only 79.0% of the bases are identical between BTV-11 and -13. Comparison of the VP7 proteins demonstrates that 100% of the amino acids are conserved between BTV-11 and -10 and 93.7% of these residues are identical between VP7 of BTV-11 and -13. The adaptation of the polymerase chain reaction to the full-length cloning and amplification of dsRNA (ClampR) should greatly facilitate molecular studies within the Reoviridae family.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Antigens, Viral / genetics
  • Base Sequence
  • Bluetongue virus / classification
  • Bluetongue virus / genetics*
  • Capsid / genetics*
  • Capsid Proteins*
  • Cloning, Molecular / methods
  • DNA, Viral / biosynthesis
  • DNA, Viral / genetics*
  • Genes, Viral*
  • Molecular Sequence Data
  • Oligonucleotide Probes
  • Polymerase Chain Reaction
  • RNA, Double-Stranded / genetics*
  • Reoviridae / genetics*
  • Sequence Homology, Nucleic Acid
  • Serotyping


  • Antigens, Viral
  • Capsid Proteins
  • DNA, Viral
  • Oligonucleotide Probes
  • RNA, Double-Stranded
  • VP7 protein, Rotavirus

Associated data

  • GENBANK/M32102