NDLI: Defining the RNA-binding glycine-rich (RBG) gene superfamily: new insights into nomenclature, phylogeny, and evolutionary trends obtained by genome-wide comparative analysis of Arabidopsis, Chinese cabbage, rice and maize genomes

Content Provider	Springer Nature Link
Author	Krishnamurthy, Panneerselvam Kim, Jin A Jeong, Mi Jeong Kang, Chang Ho Lee, Soo In
Copyright Year	2015
Abstract	RNA-binding glycine-rich (RBG) proteins play diverse roles in plant growth, development, protection and genome organization. An overly broad definition for class IV glycine-rich proteins (GRPs), namely RNA-binding activity and a glycine-rich C-terminus, has resulted in many distantly related and/or non-related proteins being grouped into this class of RBGs. This definition has hampered the study of RBG evolution. In this study, we used a comparative genomic approach consisting of ortholog, homolog, synteny and phylogenetic analyses to legitimately exclude all distantly/non-related proteins from class IV GRPs and to identify 15, 22, 12 and 18 RBG proteins in Arabidopsis, Chinese cabbage, rice and maize genomes, respectively. All identified RBGs could be divided into three subclasses, namely RBGA, RBGB and RBGD, which may be derived from a common ancestor. We assigned RBGs excluded from class IV GRPs to a separate RBG superfamily. RBGs have evolved and diversified in different species via different mechanisms; segmental duplication and recombination have had major effects, with tandem duplication, intron addition/deletion and domain recombination/deletion playing minor roles. Loss and retention of duplicated RBGs after polyploidization has been species and subclass specific. For example, following recent whole-genome duplication and triplication in maize and Chinese cabbage, respectively, most duplicated copies of RBGA have been lost in maize while RBGD duplicates have been retained; in Chinese cabbage, in contrast, RBGA duplicates have been retained while RBGD duplicates have been lost. Our findings reveal fundamental information and shed new light on the structural characteristics and evolutionary dynamics of RBGs.
Starting Page	2279
Ending Page	2295
Page Count	17
File Format	PDF
ISSN	16174615
Journal	Molecular and General Genetics MGG
Volume Number	290
Issue Number	6
e-ISSN	16174623
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-06-30
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	RNA-binding glycine-rich proteins Comparative genomics Polyploidization Evolutionary patterns Gene/protein superfamily Cell Biology Biochemistry Microbial Genetics and Genomics Plant Genetics & Genomics Animal Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Molecular Biology

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