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2017 ; 7
(1
): 3525
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An earlier revolution: genetic and genomic analyses reveal pre-existing cultural
differences leading to Neolithization
#MMPMID28615641
Leonardi M
; Barbujani G
; Manica A
Sci Rep
2017[Jun]; 7
(1
): 3525
PMID28615641
show ga
Archaeological evidence shows that, in the long run, Neolitization (the
transition from foraging to food production) was associated with demographic
growth. We used two methods (patterns of linkage disequilibrium from whole-genome
SNPs and MSMC estimates on genomes) to reconstruct the demographic profiles for
respectively 64 and 24 modern-day populations with contrasting lifestyles across
the Old World (sub-Saharan Africa, south-eastern Asia, Siberia). Surprisingly, in
all regions, food producers had larger effective population sizes (N (e)) than
foragers already 20?k years ago, well before the Neolithic revolution. As
expected, this difference further increased ~12-10?k years ago, around or just
before the onset of food production. Using paleoclimate reconstructions, we show
that the early difference in N (e) cannot be explained by food producers
inhabiting more favorable regions. A number of mechanisms, including ancestral
differences in census size, sedentism, exploitation of the natural resources,
social stratification or connectivity between groups, might have led to the early
differences in Ne detected in our analyses. Irrespective of the specific
mechanisms involved, our results provide further evidence that long term cultural
differences among populations of Palaeolithic hunter-gatherers are likely to have
played an important role in the later Neolithization process.