Article ; Online: Patterns of Change in Nucleotide Diversity Over Gene Length.
2024 Volume 16, Issue 4
Abstract: Nucleotide diversity at a site is influenced by the relative strengths of neutral and selective population genetic processes. Therefore, attempts to estimate Effective population size based on the diversity of synonymous sites demand a better ... ...
Abstract | Nucleotide diversity at a site is influenced by the relative strengths of neutral and selective population genetic processes. Therefore, attempts to estimate Effective population size based on the diversity of synonymous sites demand a better understanding of their selective constraints. The nucleotide diversity of a gene was previously found to correlate with its length. In this work, I measure nucleotide diversity at synonymous sites and uncover a pattern of low diversity towards the translation initiation site of a gene. The degree of reduction in diversity at the translation initiation site and the length of this region of reduced diversity can be quantified as "Effect Size" and "Effect Length" respectively, using parameters of an asymptotic regression model. Estimates of Effect Length across bacteria covaried with recombination rates as well as with a multitude of translation-associated traits such as the avoidance of mRNA secondary structure around translation initiation site, the number of rRNAs, and relative codon usage of ribosomal genes. Evolutionary simulations under purifying selection reproduce the observed patterns and diversity-length correlation and highlight that selective constraints on the 5'-region of a gene may be more extensive than previously believed. These results have implications for the estimation of effective population size, and relative mutation rates, and for genome scans of genes under positive selection based on "silent-site" diversity. |
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MeSH term(s) | Genetic Variation ; Evolution, Molecular ; Selection, Genetic ; Models, Genetic ; Nucleotides/genetics ; Codon Usage ; Peptide Chain Initiation, Translational |
Chemical Substances | Nucleotides |
Language | English |
Publishing date | 2024-04-09 |
Publishing country | England |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ZDB-ID | 2495328-3 |
ISSN | 1759-6653 ; 1759-6653 |
ISSN (online) | 1759-6653 |
ISSN | 1759-6653 |
DOI | 10.1093/gbe/evae078 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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