Molecular phylogenetics has neglected polymorphisms within present and ancestral populations for a long time. Alternative models accounting for multi-individual data have nevertheless been proposed and are known as polymorphism-aware phylogenetic models (PoMo, De Maio et al., 2015). PoMo adds a new layer of complexity to the standard nucleotide substitution models by accounting for the population-level (so far, genetic drift and mutations) processes to describe the evolutionary process. To do so, PoMo expands the standard substitution models to include polymorphic states. We have previously shown that PoMo accounts for incomplete lineage sorting (ILS) and improve the estimation of species tree inference.
Recently we have developed an approach that accounts for selection called PoMoSelect (Borges et al., 2022). Genetic drift removes polymorphism from populations over time, with the rate of polymorphism loss being accelerated when species experience strong reductions in population size. Adaptive forces that maintain genetic variation in populations, or balancing selection, might counteract this process. PoMo is a mutation-selection model which we will allow disentangle selection as well as mutational effects, fixation biases, and demographic effects.
As the complexity of our PoMo models grows we hope to use machine learning techniques that have recently been developed to allow the estimation of parameters from large-scale data using deep learning (Voznica et al., 2022). This will allow us to study evolutionary processes across the tree of life with our collaborators.
Informal enquiries are welcome and should be made by email to Carolin Kosiol ([Email Address Removed])
HOW TO APPLY
Details of the competition and how to apply are given here: https://www.st-andrews.ac.uk/study-abroad/global-research/csc/
Applicants must submit an application for entry onto the School's PhD programme. Please do this via the Online Application Portal by the 9th January 2023. Once submitted, applicants must also submit a separate application for the scholarship by Thursday 12th January 2023.
We require the following documents; CV, personal statement, 2 references, academic qualifications, English language qualification.
Keywords: Speciation, phylogenetics, molecular evolution, comparative genomics, machine learning, bioinformatics