ECB-ART-49226
Sci Adv
2021 Apr 23;717:. doi: 10.1126/sciadv.abd2274.
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Comparative genomic analysis of sifakas (Propithecus) reveals selection for folivory and high heterozygosity despite endangered status.
Guevara EE
,
Webster TH
,
Lawler RR
,
Bradley BJ
,
Greene LK
,
Ranaivonasy J
,
Ratsirarson J
,
Harris RA
,
Liu Y
,
Murali S
,
Raveendran M
,
Hughes DST
,
Muzny DM
,
Yoder AD
,
Worley KC
,
Rogers J
.
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Sifakas (genus Propithecus) are critically endangered, large-bodied diurnal lemurs that eat leaf-based diets and show corresponding anatomical and microbial adaptations to folivory. We report on the genome assembly of Coquerel's sifaka (P. coquereli) and the resequenced genomes of Verreaux's (P. verreauxi), the golden-crowned (P. tattersalli), and the diademed (P. diadema) sifakas. We find high heterozygosity in all sifakas compared with other primates and endangered mammals. Demographic reconstructions nevertheless suggest declines in effective population size beginning before human arrival on Madagascar. Comparative genomic analyses indicate pervasive accelerated evolution in the ancestral sifaka lineage affecting genes in several complementary pathways relevant to folivory, including nutrient absorption and xenobiotic and fatty acid metabolism. Sifakas show convergent evolution at the level of the pathway, gene family, gene, and amino acid substitution with other folivores. Although sifakas have relatively generalized diets, the physiological challenges of habitual folivory likely led to strong selection.
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