Conservation and divergence of plant microRNA genes

Zhang, Baohong; Pan, Xiaoping; Cannon, Charles H.; Cobb, George P.; Anderson, Todd A.

doi:10.1111/j.1365-313x.2006.02697.x

Cited by 669 publications

(662 citation statements)

References 57 publications

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“…Several families of microRNAs (miRNAs) have been found in green plants ranging from algae, mosses, ferns, gymnosperms and angiosperms (Floyd and Bowman, 2004;Arazi et al, 2005;Axtell and Bartel, 2005;Molnár et al, 2007;Zhang et al, 2006;Zhao et al, 2007) suggesting that the regulation by miRNA is ancient in origin. At least 88 annotated miRNA families have been identified in the moss P. patens and 44 in the lycopod Selaginella moellendorffii (Axtell et al, 2007;Fattash et al, 2007).…”

Section: Bryophytes As An Ancient Lineage May Have Retained Many Novementioning

confidence: 99%

Hormonal regulation in green plant lineage families

Johri

2008

Physiol Mol Biol Plants

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The patterns of phytohormones distribution, their native function and possible origin of hormonal regulation across the green plant lineages (chlorophytes, charophytes, bryophytes and tracheophytes) are discussed. The five classical phytohormonesauxins, cytokinins, gibberellins (GA), abscisic acid (ABA) and ethylene occur ubiquitously in green plants. They are produced as secondary metabolites by microorganisms. Some of the bacterial species use phytohormones to interact with the plant as a part of their colonization strategy. Phytohormone biosynthetic pathways in plants seem to be of microbial origin and furthermore, the origin of high affinity perception mechanism could have preceded the recruitment of a metabolite as a hormone. The bryophytes represent the earliest land plants which respond to the phytohormones with the exception of gibberellins. The regulation by auxin and ABA may have evolved before the separation of green algal lineage. Auxin enhances rhizoid and caulonemal differentiation while cytokinins enhance shoot bud formation in mosses. Ethylene retards cell division but seems to promote cell elongation. The presence of responses specific to cytokinins and ethylene strongly suggest the origin of their regulation in bryophytes. The hormonal role of GAs could have evolved in some of the ferns where antheridiogens (compounds related to GAs) and GAs themselves regulate the formation of antheridia.During migration of life forms to land, the tolerance to desiccation may have evolved and is now observed in some of the microorganisms, animals and plants. Besides plants, sequences coding for late embryogenesis abundant-like proteins occur in the genomes of other anhydrobiotic species of microorganisms and nematodes. ABA acts as a stress signal and increases rapidly upon desiccation or in response to some of the abiotic stresses in green plants. As the salt stress also increases ABA release in the culture medium of cyanobacterium Trichormus variabilis, the recruitment of ABA in the regulation of stress responses could have been derived from prokaryotes and present at the level of common ancestor of green plants. The overall hormonal action mechanisms in mosses are remarkably similar to that of the higher plants. As plants are thought to be monophyletic in origin, the existence of remarkably similar hormonal mechanisms in the mosses and higher plants, suggests that some of the basic elements of regulation cascade could have also evolved at the level of common ancestor of plants. The networking of various steps in a cascade or the crosstalk between different cascades is variable and reflects the dynamic interaction between a species and its specific environment.

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Section: Bryophytes As An Ancient Lineage May Have Retained Many Novementioning

confidence: 99%

Hormonal regulation in green plant lineage families

Johri

2008

Physiol Mol Biol Plants

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“…Similar observation was also reported in plant genomes. Recent work by Zhang et al [38] has shown, from more than 6 million plant EST sequences, a total of 481 miRNAs that belong to 37 miRNA families from 71 different plant species. Plant miRNAs have been demonstrated to be conserved across gymnosperms, fern, moss, and liverwort [3].…”

Section: The Mirna Gene Familiesmentioning

confidence: 99%

Evolution of plant microRNA gene families

Mao

2006

Cell Res

151

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MicroRNAs (miRNAs) are important post-transcriptional regulators of their target genes in plants and animals. miRNAs are usually 20-24 nucleotides long. Despite their unusually small sizes, the evolutionary history of miRNA gene families seems to be similar to their protein-coding counterparts. In contrast to the small but abundant miRNA families in the animal genomes, plants have fewer but larger miRNA gene families. Members of plant miRNA gene families are often highly similar, suggesting recent expansion via tandem gene duplication and segmental duplication events. Although many miRNA genes are conserved across plant species, the same gene family varies significantly in size and genomic organization in different species, which may cause dosage effects and spatial and temporal differences in target gene regulations. In this review, we summarize the current progress in understanding the evolution of plant miRNA gene families.

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“…The phylogenetic distribution and evolution of animal and plant miRNAs have been studied in recent reports [2][3][4][5][6][7][8][9][10][11][12]. In animals, the expansion of miRNAs is an ongoing process [5].…”

Section: Introductionmentioning

confidence: 99%

Systematic analysis of human microRNA divergence based on evolutionary emergence

et al. 2010

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a b s t r a c tMicroRNAs (miRNAs) play important roles in post-transcriptional gene expression control. To gain new insight into human miRNAs, we performed comprehensive sequence-based homology search for known human miRNAs to study the evolutionary distribution of human miRNAs. Furthermore, we carried out a series of studies to compare various features for different lineage-specific human miRNAs. Our results showed that major expansions of human miRNA genes coincide with the advent of vertebrates, mammals and primates. Further system-level analysis revealed significant differences in human miRNAs that arose from different evolutionary time points for a number of characteristics, implicating genetic and functional diversification for different human miRNAs during evolution. Our finds provide more useful knowledge for further exploring origins and evolution of human miRNA genes.

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Conservation and divergence of plant microRNA genes

Cited by 669 publications

References 57 publications

Hormonal regulation in green plant lineage families

Hormonal regulation in green plant lineage families

Evolution of plant microRNA gene families

Systematic analysis of human microRNA divergence based on evolutionary emergence

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