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. 2019 Jun 17;10(1):2665.
doi: 10.1038/s41467-019-10121-3.

Genomic structure and diversity of Plasmodium falciparum in Southeast Asia reveal recent parasite migration patterns

Collaborators, Affiliations

Genomic structure and diversity of Plasmodium falciparum in Southeast Asia reveal recent parasite migration patterns

Amol C Shetty et al. Nat Commun. .

Abstract

Estimates of Plasmodium falciparum migration may inform strategies for malaria elimination. Here we elucidate fine-scale parasite population structure and infer recent migration across Southeast Asia using identity-by-descent (IBD) approaches based on genome-wide single nucleotide polymorphisms called in 1722 samples from 54 districts. IBD estimates are consistent with isolation-by-distance. We observe greater sharing of larger IBD segments between artemisinin-resistant parasites versus sensitive parasites, which is consistent with the recent spread of drug resistance. Our IBD analyses reveal actionable patterns, including isolated parasite populations, which may be prioritized for malaria elimination, as well as asymmetrical migration identifying potential sources and sinks of migrating parasites.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Fig. 1
Fig. 1
Sampling locations within the Greater Mekong Subregion and Bangladesh. Red circles mark districts where P. falciparum isolates were sampled. Circle area is proportional to the number of isolates sampled in that district. The SRTMGL3 elevation data was retrieved from the online EarthExplorer, courtesy of the NASA Land Processes Distributed Active Archive Center (LP DAAC), USGS/Earth Resources Observation and Science (EROS) Center, Sioux Falls, South Dakota, https://earthexplorer.usgs.gov/
Fig. 2
Fig. 2
Cumulative pairwise IBD sharing between all parasites. a All segments greater than 2 cM, b 2–15 cM, c 15–30 cM, and d greater than 30 cM. Panels bd are subsets of panel a. Each tile denotes the cumulative IBD sharing between isolates. Bangladesh and Thailand are abbreviated as BD and TH, respectively. The color indicates the magnitude of total IBD sharing
Fig. 3
Fig. 3
Regional relatedness within and between districts. a All segments greater than 2 cM, b 2–15 cM, c 15–30 cM, and d greater than 30 cM. Sharing of larger IBD segments indicates more recent migration. Circles represent the average IBD sharing within a district while lines represent the average IBD sharing between two districts. The color indicates the magnitude of IBD sharing while the area of the circle represents the average number of segments shared. Only district-pairs with >3% isolate-pairs demonstrating IBD sharing are included. Map data: Google, 2018
Fig. 4
Fig. 4
Asymmetrical migration between districts in Cambodia. Directional migration was inferred using IBD estimates between nonadmixed and admixed isolates across districts. Statistically significant asymmetrical migration between two districts is indicated by an arrow. Malaria endemicity is indicated in green. Map data: Malaria Atlas Project (https://map.ox.ac.uk/)
Fig. 5
Fig. 5
EEMS contours illustrating relative migration. Each circle is a deme consisting of one or more districts, with area proportional to the number of isolates in the deme. Panels depict relative parasite migration in a Southeast Asia and b Cambodia, with brown contours indicating lower levels of migration and blue contours indicating higher levels of migration

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