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Plant evolution is characterized by frequent genome duplication events. Expansion of habitat resulted in the origin of many novel genes and genome duplication events which in turn resulted in the expansion of many regulatory gene families. The plant-specific  FCS-Like Zinc finger  ( FLZ ) gene family is characterized by the presence of a FCS-Like Zinc finger (FLZ) domain which mediates the protein-protein interaction. In this study, we identified that the expansion of  FLZ  gene family size in different species is correlated with ancestral and lineage-specific whole genome duplication events. The subsequent gene loss found to have a greater role in determining the size of this gene family in many species. However, genomic block duplications played the significant role in the expansion of  FLZ  gene family in some species. Comparison of  Arabidopsis thaliana  and  Oryza sativa FLZ  gene family revealed monocot and dicot specific evolutionary trends. The  FLZ  genes were found to be under high purifying selection. The spatiotemporal expression analyses of  Arabidopsis thaliana FLZ  gene family revealed that majority of the members are highly expressed in reproductive organs.  FLZ  genes were also found to be highly expressed during vegetative-to-reproductive phase transition which is correlated with the proposed role of this gene family in sugar signaling. The comparison of sequence, structural and expression features of duplicated genes identified lineage-specific redundancy and divergence. This extensive evolutionary analysis and expression analysis of  Arabidopsis thaliana FLZ  genes will pave the way for further functional analysis of  FLZ  genes.

Comprehensive Evolutionary and Expression Analysis of FCS-Like Zinc finger Gene Family Yields Insights into Their Origin, Expansion and Divergence