Electronic Journal of Probability

The infinitely many genes model with horizontal gene transfer

Franz Baumdicker and Peter Pfaffelhuber

Full-text: Open access

Abstract

The genome of bacterial species is much more flexible than that of eukaryotes. Moreover, the distributed genome hypothesis for bacteria states that the total number of genes present in a bacterial population is greater than the genome of every single individual. The pangenome, i.e. the set of all genes of a bacterial species (or a sample), comprises the core genes which are present in all living individuals, and accessory genes, which are carried only by some individuals. In order to use accessory genes for adaptation to environmental forces, genes can be transferred horizontally between individuals. Here, we extend the infinitely many genes model from Baumdicker, Hess and Pfaffelhuber (2010) for horizontal gene transfer. We take a genealogical view and give a construction – called the Ancestral Gene Transfer Graph – of the joint genealogy of all genes in the pangenome. As application, we compute moments of several statistics (e.g. the number of differences between two individuals and the gene frequency spectrum) under the infinitely many genes model with horizontal gene transfer.

 

Article information

Source
Electron. J. Probab., Volume 19 (2014), paper no. 115, 27 pp.

Dates
Accepted: 14 December 2014
First available in Project Euclid: 4 June 2016

Permanent link to this document
https://projecteuclid.org/euclid.ejp/1465065757

Digital Object Identifier
doi:10.1214/EJP.v19-2642

Mathematical Reviews number (MathSciNet)
MR3296531

Zentralblatt MATH identifier
1327.92028

Subjects
Primary: 92D15: Problems related to evolution 60J70: Applications of Brownian motions and diffusion theory (population genetics, absorption problems, etc.) [See also 92Dxx] 92D20: Protein sequences, DNA sequences
Secondary: 60K35: Interacting random processes; statistical mechanics type models; percolation theory [See also 82B43, 82C43]

Keywords
Prokaryote bacterial evolution coalescent gene frequency spectrum pangenome

Rights
This work is licensed under a Creative Commons Attribution 3.0 License.

Citation

Baumdicker, Franz; Pfaffelhuber, Peter. The infinitely many genes model with horizontal gene transfer. Electron. J. Probab. 19 (2014), paper no. 115, 27 pp. doi:10.1214/EJP.v19-2642. https://projecteuclid.org/euclid.ejp/1465065757


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