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Population genetics analysis of Phlebotomus papatasi sand flies from Egypt and Jordan based on mitochondrial cytochrome b haplotypes

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Date
2018-03-27
Author
Flanley, Catherine M.
Ramalho-Ortigao, Marcelo
Coutinho-Abreu, Iliano V.
Mukbel, Rami
Hanafi, Hanafi A.
El-Hossary, Shabaan S.
Fawaz, Emad El-Din Y.
Hoel, David F.
Bray, Alexander W.
Stayback, Gwen
Shoue, Douglas A.
Kamhawi, Shaden
Karakuş, Mehmet
Jaouadi, Kaouther
Yaghoobie-Ershadi, Mohammad Reza
Krüger, Andreas
Amro, Ahmad
Kenawy, Mohamed Amin
Dokhan, Mostafa Ramadhan
Warburg, Alon
Hamarsheh, Omar
McDowell, Mary Ann
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Abstract
Background: Phlebotomus papatasi sand flies are major vectors of Leishmania major and phlebovirus infection in North Africa and across the Middle East to the Indian subcontinent. Population genetics is a valuable tool in understanding the level of genetic variability present in vector populations, vector competence, and the development of novel control strategies. This study investigated the genetic differentiation between P. papatasi populations in Egypt and Jordan that inhabit distinct ecotopes and compared this structure to P. papatasi populations from a broader geographical range. Methods: A 461 base pair (bp) fragment from the mtDNA cytochrome b (cyt b) gene was PCR amplified and sequenced from 116 individual female sand flies from Aswan and North Sinai, Egypt, as well as Swaimeh and Malka, Jordan. Haplotypes were identified and used to generate a median-joining network, FST values and isolation-bydistance were also evaluated. Additional sand fly individuals from Afghanistan, Iran, Israel, Jordan, Libya, Tunisia and Turkey were included as well as previously published haplotypes to provide a geographically broad genetic variation analysis. Results: Thirteen haplotypes displaying nine variant sites were identified from P. papatasi collected in Egypt and Jordan. No private haplotypes were identified from samples in North Sinai, Egypt, two were observed in Aswan, Egypt, four from Swaimeh, Jordan and two in Malka, Jordan. The Jordan populations clustered separately from the Egypt populations and produced more private haplotypes than those from Egypt. Pairwise FST values fall in the range 0.024–0.648. (Continued on next page) (Continued from previous page) Conclusion: The clustering patterns and pairwise FST values indicate a strong differentiation between Egyptian and Jordanian populations, although this population structure is not due to isolation-by-distance. Other factors, such as environmental influences and the genetic variability in the circulating Le. major parasites, could possibly contribute to this heterogeneity. The present study aligns with previous reports in that pockets of genetic differentiation exists between populations of this widely dispersed species but, overall, the species remains relatively homogeneous.
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https://dspace.alquds.edu/handle/20.500.12213/5057
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