期刊
MOLECULAR ECOLOGY RESOURCES
卷 21, 期 5, 页码 1504-1516出版社
WILEY
DOI: 10.1111/1755-0998.13359
关键词
ecological speciation; hybridization; malaria vector
资金
- Wellcome Trust [204911/Z/16/Z, 206194, 090770, 204911, 090770/Z/09/ Z, 203141/Z/16/Z]
- Insitut Pasteur Paris [ACIP 41-17]
- Department for International Development [MR/M006212/1]
- Sapienza Universita di Roma [ATENEO 2018]
The study aimed to develop novel tools for genotyping two efficient vectors of human malaria in Africa, Anopheles coluzzii and An. gambiae, using ancestral informative markers identified from a specific genome project. The multilocus approach was able to capture patterns of admixture in samples from the westernmost hybridization zone, providing new insights into interspecific admixture in the region. Additionally, a cost-effective PCR approach was developed for advanced identification of species and admixed specimens in routine large-scale entomological surveys, particularly at regions where unexpected autosomal admixture was highlighted by whole genome sequencing data.
The two most efficient and most recently radiated Afrotropical vectors of human malaria - Anopheles coluzzii and An. gambiae - are identified by single-locus diagnostic PCR assays based on species-specific markers in a 4 Mb region on chromosome-X centromere. Inherently, these diagnostic assays cannot detect interspecific autosomal admixture shown to be extensive at the westernmost and easternmost extremes of the species range. The main aim of this study was to develop novel, easy-to-implement tools for genotyping An. coluzzii and An. gambiae-specific ancestral informative markers (AIMs) identified from the Anopheles gambiae 1000 genomes (Ag1000G) project. First, we took advantage of this large set of data in order to develop a multilocus approach to genotype 26 AIMs on all chromosome arms valid across the species range. Second, we tested the multilocus assay on samples from Guinea Bissau, The Gambia and Senegal, three countries spanning the westernmost hybridization zone, where conventional species diagnostic is problematic due to the putative presence of a novel hybrid form. The multilocus assay was able to capture patterns of admixture reflecting those revealed by the whole set of AIMs and provided new original data on interspecific admixture in the region. Third, we developed an easy-to-use, cost-effective PCR approach for genotyping two AIMs on chromosome-3 among those included in the multilocus approach, opening the possibility for advanced identification of species and of admixed specimens during routine large scale entomological surveys, particularly, but not exclusively, at the extremes of the range, where WGS data highlighted unexpected autosomal admixture.
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