標題: Protein complexity, gene duplicability and gene dispensability in the yeast genome
作者: Lin, Yeong-Shin
Hwang, Jenn-Kang
Li, Wen-Hsiung
生物科技學系
Department of Biological Science and Technology
關鍵字: protein complex;gene deletion;fitness effect;duplicate gene;protein domain;whole genome duplication
公開日期: 31-一月-2007
摘要: Using functional genomic and protein structural data we studied the effects of protein complexity (here defined as the number of subunit types in a protein) on gene dispensability and gene duplicability. We found that in terms of gene duplicability the major distinction in protein complexity is between hetero-complexes, each of which includes at least two different types of subunits (polypeptides), and homo-complexes, which include monomers and complexes that consist of only subunits of one polypeptide type. However, gene dispensability decreases only gradually as the number of subunit types in a protein complex increases. These observations suggest that the dosage balance hypothesis can explain well gene duplicability of complex proteins, but cannot completely explain the difference in dispensabilities between hetero-complex subunits. It is likely that knocking out a gene coding for a hetero-complex subunit would disrupt the function of the whole complex, so that the deletion effect on fitness would increase with protein complexity. We also found that multi-domain polypeptide genes are less dispensable but more duplicable than single-domain polypeptide genes. Duplicate genes derived from the whole genuine duplication event in yeast are more dispensable (except for ribosomal protein genes) than other duplicate genes. Further, we found that subunits of the same protein complex tend to have similar expression levels and similar effects of gene deletion on fitness. Finally, we estimated that in yeast the contribution of duplicate genes to genetic robustness against null mutation is similar to 9%, smaller than previously estimated. In yeast, protein complexity may serve as a better indicator of gene dispensability than do duplicate genes. (c) 2006 Elsevier B.V All rights reserved.
URI: http://dx.doi.org/10.1016/j.gene.2006.08.022
http://hdl.handle.net/11536/11213
ISSN: 0378-1119
DOI: 10.1016/j.gene.2006.08.022
期刊: GENE
Volume: 387
Issue: 1-2
起始頁: 109
結束頁: 117
顯示於類別:期刊論文


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