Emergence, Retention and Selection: A Trilogy of Origination for Functional De Novo Proteins from Ancestral LncRNAs in Primates: e1005391

While some human-specific protein-coding genes have been proposed to originate from ancestral lncRNAs, the transition process remains poorly understood. Here we identified 64 hominoid-specific de novo genes and report a mechanism for the origination of functional de novo proteins from ancestral lncR...

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Bibliographic Details
Published in:PLoS genetics 2015-07, Vol.11 (7)
Main Authors: Chen, Jia-Yu, Shen, Qing Sunny, Zhou, Wei-Zhen, Peng, Jiguang, He, Bin Z, Li, Yumei, Liu, Chu-Jun, Luan, Xuke, Ding, Wanqiu, Li, Shuxian, Chen, Chunyan, Tan, Bertrand Chin-Ming, Zhang, Yong E, He, Aibin, Li, Chuan-Yun
Format: Article
Language:English
Subjects:
Annotations
Evolution
Experiments
Genes
Genomes
Macaca mulatta
Population genetics
Proteins
Retention
Studies
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Summary:While some human-specific protein-coding genes have been proposed to originate from ancestral lncRNAs, the transition process remains poorly understood. Here we identified 64 hominoid-specific de novo genes and report a mechanism for the origination of functional de novo proteins from ancestral lncRNAs with precise splicing structures and specific tissue expression profiles. Whole-genome sequencing of dozens of rhesus macaque animals revealed that these lncRNAs are generally not more selectively constrained than other lncRNA loci. The existence of these newly-originated de novo proteins is also not beyond anticipation under neutral expectation, as they generally have longer theoretical lifespan than their current age, due to their GC-rich sequence property enabling stable ORFs with lower chance of non-sense mutations. Interestingly, although the emergence and retention of these de novo genes are likely driven by neutral forces, population genetics study in 67 human individuals and 82 macaque animals revealed signatures of purifying selection on these genes specifically in human population, indicating a proportion of these newly-originated proteins are already functional in human. We thus propose a mechanism for creation of functional de novo proteins from ancestral lncRNAs during the primate evolution, which may contribute to human-specific genetic novelties by taking advantage of existed genomic contexts.
ISSN:1553-7390
1553-7404
DOI:10.1371/journal.pgen.1005391