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Sequence heterogeneity of the envelope-like domain in cultivated allotetraploid Gossypium species and their diploid progenitors
Faculty
Not Specified
Year:
2009
Type of Publication:
Article
Pages:
17-23
Authors:
Hafez, E. E, Ghany, A. A. Abdel, Paterson, A. H, Zaki, E. A
DOI:
10.1007/BF03195647
Journal:
JOURNAL OF APPLIED GENETICS POLISH ACAD SCIENCES, INST PLANT GENETICS
Volume:
50
Research Area:
Biotechnology \& Applied Microbiology; Genetics \& Heredity
ISSN
ISI:000263667600003
Keywords :
envelope gene, Gossypium, horizontal transfer, metavirus, retrotransposons, retroviruses
Abstract:
Retroviral envelope (env)-like sequences in 2 cultivated allotetraploid cottons and their diploid progenitors have been identified and characterized in this study. DNA sequence analysis reveals that these sequences are heterogeneous. The observed sequence diversity, however, seems to preserve coding information. This is evidenced by the detection of the transmembrane domain (TM), which is the most conserved feature of the divergent retroviral env genes. The high ratio of synonymous to nonsynonymous changes suggests that these sequences are evolving under purifying selection. Phylogenetic analysis shows that Gossypium sequences closely cluster with a lineage of plant endogenous retroviruses that have an env-like gene. These results provide evidence for the antiquity and the wide diversity of env-like sequences in the Gossypium genome.
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