Inferring Selection and Population Structure From Sequence Data

Estimating and disentangling the contribution of different evolutionary processes such as genetic drift, mutation or gene flow is a central issue in statistical population genetics. The genetic configuration of a population is affected by its past demography. Thus, the demographic structure of a population can be inferred from genetic data; even if one is primarily interested in detecting where selection acts on the genome, demography has to be accounted for.  Stefanie Belohlavy is finding ways to use haplotype structure to disentangle signals of selection from ancestral population structure; we have applied this method to help analyse a selection experiment on mice (Castro et al., 2019).  Parvathy Surendranadh is testing methods for demographic inference against the Antirrhinum data. Sean Stankowski and Daria Shipilina (Uppsala Univ.) are working with Frank Chan (MPI Tübingen) to use “haplotagging” to better understand how selection and population structure interact (Meier et al., 2020).

Recent Papers

Lohse, K., Chmelik, M., Martin, S.H., Barton, N.H. 2016. Efficient strategies for calculating blockwise likelihoods under the coalescent. Genetics 202: 775-786

Castro, J.P.L., Marchini, M., Belohlavy, S., Yancoskie, M.N., Kucka, M., Beluch, W.H., Naumann, R., Barton, N.H., Rolian, C., Chan, Y.F. 2019. An integrative genomic analysis of the Longshanks selection experiment for longer limbs in mice. eLife 8:e42014 

Meier, J.I.,  Salazar, P.A., Kucka, M., Davied, R.W., Dreau, A., Aldas, I., Power, O.B., Nadeau, N.J., Bridle, J.R., Rolian, C., Barton, N.H., McMillan, O., Jiggins, C.D., Chan, Y.F.  2020. Haplotype tagging reveals parallel formation of hybrid races in two butterfly species. PNAS 118 (25) e2015005118

Surendranadh P, Arathoon LS, Baskett C, Field D, Pickup M, Barton NH. 2022. Effects of fine-scale population structure on the distribution of heterozygosity in a long-term study of Antirrhinum majus. Genetics 221(3), iyac083.