 (2018) propose that R1b-V88 originated in Europe about 12 000 years ago and crossed to North Africa by about 8000 years ago; it may formerly have been common in southern Europe, where it has since been replaced by waves of other haplogroups, leaving remnant subclades almost excusively in Sardinia.It first radiated within Africa likely between 7 and 8 000 years ago – at the same time as trans-Saharan expansions within the unrelated haplogroups E-M2 and A-M13 – possibly due to population growth allowed by humid conditions and the adoption of livestock herding in the Sahara.R1b-V1589, the main subclade within R1b-V88, underwent a further expansion around 5500 years ago, likely in the Lake Chad Basin region, from which some lines recrossed the Sahara to North Africa.