Anopheles sinensis

Anopheles sinensis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Diptera
Family: Culicidae
Genus: Anopheles
Species: A. sinensis
Binomial name
Anopheles sinensis
Wiedemann, 1828

Anopheles sinensis is a species of mosquito that transmits malaria as well as lymphatic filariasis. It is regarded as the most important vector of these human parasitic diseases in Southeast Asia.[1][2] It is the primary vector of vivax malaria (Plasmodium vivax) in many regions. In China it also transmits the filalarial parasite (Wuchereria bancrofti),[3] and arthropod roundworm (Romanomermis jingdeensis).[4] In Japan it is also a vector of a roundworm Setaria digitata in sheep and goats.[5][6]

Because of its similarity with other Anopheles, it is now considered a species complex comprising at least four species. Its genome was sequenced in 2014.[7]

Taxonomy and description

An. sinensis is classfied as a species complex, and is a member of An. hyrcanus group. The group is distinguished from other groups by the presence of pale bands (usually four) on the palpi and by the presence of a tuft of dark scales on the clypeus on each side in the female adult. It was first described by German naturalist Christian Rudolph Wilhelm Wiedemann in 1828, and became one of the earliest known species of Anopheles. Due to its similarity with other mosquitos and geographical diversity, the species was redescribed several times by different taxonomists, with names like An. yesoensis (1913), An. sineroides (1924), An. lesetri (1936), An. pullus (1937), and An. yatsushiroensis (1951). These species are considered as either synonyms or members of the species complex.[8][9][10][11]

Female An. sinensis has a dark-coloured body, with its palps are shorter than proboscis. The integument of the neck region is yellow. The legs are dark-brown on outer surface, but pale on the inside. The base of the leg is swollen towards the body. The wings are covered with dark and pale scales. The tip of the wing has a prominent spot. Larva has an elongated head. Its antennae are about the length of the head, and containing pointed spicules towards the inner side.[12]

Distribution and habitat

An. sinensis is found in northeast India, Burma, Thailand, Malaysia, Indonesia, Kampuchea, Vietnam, China, Taiwan, Japan and Korea. In India it is reported from Meghalaya, Assam, and Mizoram.[13][14] They are found in all types of environment including naturally-made clean water, stagnant or flowing. Their major habitats are rice fields, ditches, streams, irrigation cannals, marshes, ponds, and ground pools. They mostly bite large animals, and human biting is relatively less when animals are present nearby. Their feeding takes place throughout the night from dusk to dawn, but heaviest biting occurs between 2 and 4 in the morning. Even though they are attracted by lights, they prefer to bite outdoor. They hibernate mostly under part of dense grasses during October-March. At the end of the hibernation period in March-April they feed during daytime.[1] In August 1962 it was found that An. sinensis was a vector of vivax malaria in Korea.[15] It has become one of the major vectors of vivax in China.[16]

Genome

The draft genome sequence of An. sinensis was published in 2014. It has 3,972 gene clusters containing 11,300 genes that were common to the genomes of the three previously sequenced mosquito species, An. gambiae, A. aegypti, and Culex quinquefasciatus. It contains 16,766 protein-coding genes. 2377 genes had an ortholog belonging to one of the 235 known biological pathways. There are 41 microRNA, 348 tRNA and 2017 rRNA genes.[7]

References

  1. 1 2 Ree, Han-Il (2005). "Studies on Anopheles sinensis, the vector species of vivax malaria in Korea". The Korean Journal of Parasitology 43 (3): 75–92. doi:10.3347/kjp.2005.43.3.75. PMC 2712014. PMID 16192749.
  2. ↑ Chang, Xuelian; Zhong, Daibin; Fang, Qiang; Hartsel, Joshua; Zhou, Guofa; Shi, Linna; Fang, Fujin; Zhu, Changliang; Yan, Guiyun; Mutuku, Francis (2014). "Multiple Resistances and Complex Mechanisms of Anopheles sinensis Mosquito: A Major Obstacle to Mosquito-Borne Diseases Control and Elimination in China". PLoS Neglected Tropical Diseases 8 (5): e2889. doi:10.1371/journal.pntd.0002889. PMID 24852174.
  3. ↑ Zhang, S; Cheng, F; Webber, R (1994). "A successful control programme for lymphatic filariasis in Hubei, China". Transactions of the Royal Society of Tropical Medicine and Hygiene 88 (5): 510–2. doi:10.1016/0035-9203(94)90140-6. PMID 7992323.
  4. ↑ Yang, XS; Fang, TZ; Chen, DH; Cai, GY; Li, MS; Geng, RG (1984). "Preliminary field trials of Romanomermis jingdeensis against Anopheles sinensis in the suburbs of Shanghai". Chinese medical journal 97 (8): 609–12. PMID 6440752.
  5. ↑ Zhao, Yonghua (1992). "Study on the life cycle of Setaria digitata". Journal of Yunnan Agricultural University 6 (2): 110–115.
  6. ↑ Anderson, R.C. (2000). Nematode Parasites of Vertebrates Their Development and Transmission (2nd ed.). Wallingford: CAB International. p. 480. ISBN 978-0-8519-9786-5.
  7. 1 2 Zhou, Dan; Zhang, Donghui; Ding, Guohui; Shi, Linna; Hou, Qing; Ye, Yuting; Xu, Yang; Zhou, Huayun; Xiong, Chunrong; Li, Shengdi; Yu, Jing; Hong, Shanchao; Yu, Xinyou; Zou, Ping; Chen, Chen; Chang, Xuelian; Wang, Weijie; Lv, Yuan; Sun, Yan; Ma, Lei; Shen, Bo; Zhu, Changliang (2014). "Genome sequence of Anopheles sinensis provides insight into genetics basis of mosquito competence for malaria parasites". BMC Genomics 15 (1): 42. doi:10.1186/1471-2164-15-42. PMC 3901762. PMID 24438588.
  8. ↑ Hwang, UW; Tang, LH; Kobayashi, M; Yong, TS; Ree, HI (2006). "Molecular evidence supports that Anopheles anthropophagus from China and Anopheles lesteri from Japan are the same species". Journal of the American Mosquito Control Association 22 (2): 324–6. doi:10.2987/8756-971x(2006)22[324:mestaa]2.0.co;2. PMID 16878417.
  9. ↑ Yajun, M; Xu, J (2005). "The Hyrcanus group of Anopheles (Anopheles) in China (Diptera: Culicidae): species discrimination and phylogenetic relationships inferred by ribosomal DNA internal transcribed spacer 2 sequences". Journal of Medical Entomology 42 (4): 610–9. doi:10.1603/0022-2585(2005)042[0610:thgoaa]2.0.co;2. PMID 16119550.
  10. ↑ Choochote, Wej; Min, Gi-Sik; Intapan, Pewpan M; Tantrawatpan, Chairat; Saeung, Atiporn; Lulitanond, Viraphong (2014). "Evidence to support natural hybridization between Anopheles sinensis and Anopheles kleini (Diptera: Culicidae): possibly a significant mechanism for gene introgression in sympatric populations". Parasites & Vectors 7 (1): 36. doi:10.1186/1756-3305-7-36. PMC 3899613. PMID 24443885.
  11. ↑ WHO (2007). Anopheline species complexes in South and South-East Asia. New Delhi: World Health Organization, Regional Office for South-East Asia. pp. 69–70. ISBN 9789290222941.
  12. ↑ Kaiser, Norbert Becker, Dusan Petric, Marija Zgomba, Clive Boase, Minoo Madon, Christine Dahl, Achim (2010). Mosquitoes and Their Control (2nd ed.). Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg. pp. 340–341. ISBN 978-3-5409-2874-4.
  13. ↑ Khan, SA; Dutta, P; Borah, J; Mahanta, J (2013). "Survey of new mosquito species of Meghalaya, India.". Journal of Environmental Biology / Academy of Environmental Biology, India 34 (2): 191–5. PMID 24620578.
  14. ↑ Zomuanpuii, R; Guruswami, G; Nachimuthu, SK (2014). "A three year study on distribution and ecology of Anophelines in Thenzawl, Mizoram, India.". Journal of Environmental Biology / Academy of Environmental Biology, India 35 (2): 369–76. PMID 24665764.
  15. ↑ Ree, HI; Hong, HK; Paik, YH (1967). "[Study on natural infection of Plasmodium vivax in Anopheles sinensis in Korea]". The Korean Journal of Parasitology 5 (1): 3–4. doi:10.3347/kjp.1967.5.1.3. PMID 12913558.
  16. ↑ Zhu, G; Xia, H; Zhou, H; Li, J; Lu, F; Liu, Y; Cao, J; Gao, Q; Sattabongkot, J (2013). "Susceptibility of Anopheles sinensis to Plasmodium vivax in malarial outbreak areas of central China". Parasites & Vectors 6 (1): 176. doi:10.1186/1756-3305-6-176. PMC 3695883. PMID 23768077.
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