Mixture modeling of transcript abundance classes in natural populations

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1853/41847

Title: Mixture modeling of transcript abundance classes in natural populations
Author: Hsieh, Wen-Ping ; Passador-Gurgel, Gisele ; Stone, Eric A. ; Gibson, Greg
Abstract: Background. Populations diverge in genotype and phenotype under the influence of such evolutionary processes as genetic drift, mutation accumulation, and natural selection. Because genotype maps onto phenotype by way of transcription, it is of interest to evaluate how these evolutionary factors influence the structure of variation at the level of transcription. Here, we explore the distributions of cis-acting and trans-acting factors and their relative contributions to expression of transcripts that exhibit two or more classes of abundance among individuals within populations. Results. Expression profiling using cDNA microarrays was conducted in Drosophila melanogaster adult female heads for 58 nearly isogenic lines from a North Carolina population and 50 from a California population. Using a mixture modeling approach, transcripts were identified that exhibit more than one mode of transcript abundance across the samples. Power studies indicate that sample sizes of 50 individuals will generally be sufficient to detect divergent transcript abundance classes. The distribution of transcript abundance classes is skewed toward low frequency minor classes, which is reminiscent of the typical skew in genotype frequencies. Similar results are observed in reported data on gene expression in human lymphoblast cell lines, in which analysis of association with linked polymorphisms implies that cis-acting single nucleotide polymorphisms make only a modest contribution to bimodal distributions of transcript abundance. Conclusion. Population surveys of gene expression may complement genetical genomics as a general approach to quantifying sources of transcriptional variation. Differential expression of transcripts among individuals is due to a complex interplay of cis-acting and trans-acting factors.
Description: © 2007 Hsieh et al; licensee BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. DOI: 10.1186/gb-2007-8-6-r98
Type: Article
URI: http://hdl.handle.net/1853/41847
ISSN: 1465-6906
Citation: Hsieh, W.P., G.Passador-Gurgel, E.A. Stone and G. Gibson (2007) Mixture modeling of transcript abundance classes in natural populations. Genome Biol. 8(6): R98.
Date: 2007
Contributor: North Carolina State University. Dept. of Genetics
North Carolina State University. Dept. of Statistics
National Tsing Hua University. Dept. of Statistics
Publisher: Georgia Institute of Technology
BioMed Central
Subject: Transcript abundance classes
Mathematical models
Drosophila melanogaster
Expression profiling
cDNA microarrays

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