Table 1 Unique changes in the OSCA gene family in four legumes viz C. arietinum, C. cajan, V. radiata, P. vulgaris.

From: Genome-wide characterization and comparative analysis of the OSCA gene family and identification of its potential stress-responsive members in legumes

Characteristic attributes

Unique changes/features of CaOSCA, CcOSCA, VrOSCA, and PvOSCA

Phylogenetic classification

Four members: clade I (C. arietinum)

Five members: clade 1 (C. cajan, V. radiata, P. vulgaris)

Gene structure

Exon gain: CaOSCA2.2, CcOSCA2.1, CcOSCA2.2, VrOsCA2.1, VrOsCA2.2 and PvOSCA2.1

Intronless structures: Clade IV proteins

Long intronic structure: CcOSCA2.3

Essential domains

RSN1_TM, PHM7_cyt and RSN1_7TM: all clades

Two RSN1_7TM (DUF221) domains: clade IV

Truncated RSN1_TM domain: CaOSCA2.1

Transmembrane helices

6–11 transmembrane helices

Three-dimensional structure

Each OSCA protein: 11 distinct helices

Subcellular localization

Plasma membrane

Motif assembly

Clade I and II: Similar motif assembly

Motif 13: part of essential domain RSN1_TM

Motif 6: part of essential domain RSN1_7TM (DUF221)

Gene duplication types

Whole genome/segmental, tandem, and dispersed

Purifying selection pressure in all the duplicated gene pairs

Promoter analysis

Stress-responsive, hormone-responsive, and

Growth and metabolism related cis-elements

Biological processes and molecular function

Calcium-activated cation channel activity

Cation transmembrane transport

Growth and development

 ~ 50% OSCA genes

Abiotic stress regulation

Drought stress: CaOSAC2.1, PvOSCA2.5, PvOSCA2.6, PvOSCA2.1

Salt stress: CaOSAC2.6, CcOSCA2.6, CcOSCA3.1

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