Dataset Information

Genetic Consequences of the Transatlantic Slave Trade in the Americas.

ABSTRACT: According to historical records of transatlantic slavery, traders forcibly deported an estimated 12.5 million people from ports along the Atlantic coastline of Africa between the 16th and 19th centuries, with global impacts reaching to the present day, more than a century and a half after slavery's abolition. Such records have fueled a broad understanding of the forced migration from Africa to the Americas yet remain underexplored in concert with genetic data. Here, we analyzed genotype array data from 50,281 research participants, which-combined with historical shipping documents-illustrate that the current genetic landscape of the Americas is largely concordant with expectations derived from documentation of slave voyages. For instance, genetic connections between people in slave trading regions of Africa and disembarkation regions of the Americas generally mirror the proportion of individuals forcibly moved between those regions. While some discordances can be explained by additional records of deportations within the Americas, other discordances yield insights into variable survival rates and timing of arrival of enslaved people from specific regions of Africa. Furthermore, the greater contribution of African women to the gene pool compared to African men varies across the Americas, consistent with literature documenting regional differences in slavery practices. This investigation of the transatlantic slave trade, which is broad in scope in terms of both datasets and analyses, establishes genetic links between individuals in the Americas and populations across Atlantic Africa, yielding a more comprehensive understanding of the African roots of peoples of the Americas.

SUBMITTER: Micheletti SJ

PROVIDER: S-EPMC7413858 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Genetic Consequences of the Transatlantic Slave Trade in the Americas.

Micheletti Steven J SJ Bryc Kasia K Ancona Esselmann Samantha G SG Freyman William A WA Moreno Meghan E ME Poznik G David GD Shastri Anjali J AJ Beleza Sandra S Mountain Joanna L JL

American journal of human genetics 20200723 2

According to historical records of transatlantic slavery, traders forcibly deported an estimated 12.5 million people from ports along the Atlantic coastline of Africa between the 16th and 19th centuries, with global impacts reaching to the present day, more than a century and a half after slavery's abolition. Such records have fueled a broad understanding of the forced migration from Africa to the Americas yet remain underexplored in concert with genetic data. Here, we analyzed genotype array da ...[more]

PMID: 32707084

Similar Datasets

Project description:The hepatitis C virus genotype 2 (HCV2) is endemic in Western and Central Africa. The HCV2 evolutionary origins remain uncertain due to the paucity of available genomes from African settings. In this study, we investigated the molecular epidemiology of HCV infections in rural Guinea, Western Africa, during 2004 and 2014. Broadly reactive nested reverse transcription polymerase chain reaction (RT-PCR)-based screening of sera from 1,571 asymptomatic adults resulted in the detection of 25 (1.5 per cent; 95 per cent confidence interval 0.9-2.3) positive samples, with a median viral load of 2.54E + 05 IU/ml (interquartile range 6.72E + 05). HCV-infected persons had a median age of 47 years, and 62.5 per cent were male and 37.5 per cent were female. The full polyprotein-encoding genes were retrieved by a combination of high throughput and Sanger sequencing from 17 samples showing sufficiently high viral loads. Phylogenetic analysis and sequence distances ≥13 per cent averaged over the polyprotein genes compared to other HCV2 subtypes revealed nine previously unknown HCV2 subtypes. The time to the most recent common ancestor of the Guinean HCV2 strains inferred in a Bayesian framework was 493 years (95 per cent Highest posterior density (HPD) 453-532). Most of the Guinean strains clustered poorly by location on both the level of sampling sites within Guinea and the level of countries in the phylogenetic reconstructions. Ancestral state reconstruction provided decisive support (Bayes factor > 100) for an origin of HCV2 in Western Africa. Phylogeographic reconstructions in a Bayesian framework pointed to a radial diffusion of HCV2 from Western African regions encompassing today's countries like Ghana, Guinea Bissau, or Burkina Faso, to Central and Northern African regions that took place from the 16th century onwards. The spread of HCV2 coincided in time and space with the main historic slave trade and commerce routes, supported by Bayesian tip-association significance testing (P = 0.01). Our study confirms the evolutionary origins of HCV2 in Western Africa and provides a potential link between historic human movements and HCV2 dispersion.

Dataset Information

Genetic Consequences of the Transatlantic Slave Trade in the Americas.

Publications

Genetic Consequences of the Transatlantic Slave Trade in the Americas.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets