New paper (behind paywall) Sahelian pastoralism from the perspective of variants associated with lactase persistence, by Priehodová et al. Am J Phys Anthropol (2020) e24116.

Interesting excerpts from the discussion (emphasis mine, minor modifications for clarity):

Our investigation of LP variant frequencies revealed new and interesting results related to the origins of pastoralism and subsequent gene flow between pastoralists and farmers in the Sahel/Savannah belt of Africa.

• We observed a clear distinction between regions west and east of Lake Chad: while variant −13910*T prevails in the western Sahel, where we found it only in pastoralists such as the Fulani,

… Read the rest “Neolithic spread of “Eurasian” Lactase Persistence among Saharan pastoralists”