Walton, C. and Somboon, P. and O'Loughlin, S.M. and Zhang, S. and Harbach, R.E. and Linton, Y.M. and Chen, B. and Nolan, K. and Duong, S. and Fong, Mun Yik and Vythilingum, I. and Mohammed, Z.D. and Trung, H.D. and Butlin, R.K. (2007) Genetic diversity and molecular identification of mosquito species in the Anopheles maculatus group using the ITS2 region of rDNA. Infection, Genetics and Evolution, 7 (1). pp. 93-102. ISSN 1567-1348, DOI https://doi.org/10.1016/j.meegid.2006.05.001.
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Abstract
The species diversity and genetic structure of mosquitoes belonging to the Anopheles maculatus group in Southeast Asia were investigated using the internal transcribed spacer 2 (ITS2) of ribosomal DNA (rDNA). A molecular phylogeny indicates the presence of at least one hitherto unrecognised species. Mosquitoes of chromosomal form K from eastern Thailand have a unique ITS2 sequence that is 3.7 divergent from the next most closely related taxon (An. sawadwongporni) in the group. In the context of negligible intraspecific variation at ITS2, this suggests that chromosomal form K is most probably a distinct species. Although An. maculatus sensu stricto from northern Thailand and southern Thailand/peninsular Malaysia differ from each other in chromosomal banding pattern and vectorial capacity, no intraspecific variation was observed in the ITS2 sequences of this species over this entire geographic area despite an extensive survey. A PCR-based identification method was developed to distinguish five species of the group (An. maculatus, An. dravidicus, An. pseudowillmori, An. sawadwongporni and chromosomal form K) to assist field-based studies in northwestern Thailand. Sequences from 187 mosquitoes (mostly An. maculatus and An. sawadwongporni) revealed no intraspecific variation in specimens from Thailand, Cambodia, mainland China, Malaysia, Taiwan and Vietnam, suggesting that this identification method will be widely applicable in Southeast Asia. The lack of detectable genetic structure also suggests that populations of these species are either connected by gene flow and/or share a recent common history. (c) 2006 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Additional Information: | Walton, C. Somboon, P. O'Loughlin, S. M. Zhang, S. Harbach, R. E. Linton, Y. -M. Chen, B. Nolan, K. Duong, S. Fong, M-Y. Vythilingum, I. Mohammed, Z. D. Trung, Ho Dinh Butlin, R. K. |
| Uncontrolled Keywords: | Anopheles maculatus group; Malaria; Southeast Asia; ITS2; Genetic structure |
| Subjects: | R Medicine |
| Divisions: | Faculty of Medicine |
| Depositing User: | Prof. Dr. Mun Yik Fong |
| Date Deposited: | 22 Feb 2012 07:58 |
| Last Modified: | 07 May 2019 08:13 |
| URI: | http://eprints.um.edu.my/id/eprint/2739 |
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