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Confocal Microscopy Analysis of Protein Sorting to Plasmodesmata in Nicotiana benthamiana

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Dicer-like (DCL) proteins in plants.

Qingpo Liu¹, Ying Feng, Zhujun Zhu

¹School of Agriculture and Food Science, Zhejiang Forestry University, Lin'an, Hangzhou, People's Republic of China. liuqp@zjfc.edu.cn

Functional & Integrative Genomics

|February 18, 2009

Summary

Dicer-like (DCL) proteins in plants regulate small RNA biogenesis and show diverse expression patterns across development and stress responses. Evolutionary analysis reveals cis-element changes and key amino acid sites driving functional divergence in DCL family members.

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Area of Science:

Plant molecular biology
Genetics
Evolutionary biology

Background:

Dicer and Dicer-like (DCL) proteins are essential for small RNA biogenesis in plants.
The DCL protein family diversified early in plant evolution, originating with mosses.
DCLs exhibit complex expression patterns influenced by tissue type, developmental stage, and environmental conditions.

Purpose of the Study:

To investigate the expression patterns and evolutionary dynamics of Dicer-like (DCL) proteins in plants.
To explore the regulatory mechanisms and functional divergence within the DCL protein family.

Main Methods:

Comparative analysis of DCL gene expression across different plant tissues, developmental stages, and stress conditions.
Promoter region analysis to identify cis-regulatory elements.
Identification of critical amino acid sites associated with functional divergence.

Main Results:

Distinct expression profiles of DCLs were observed during reproductive organ development (flower and seed) in Arabidopsis.
Grape VvDCL1 and VvDCL3 may function sequentially in response to fungal challenges.
DCL responses to abiotic stresses (drought, cold, salt) are varied, suggesting specialized regulatory mechanisms.
Promoter analysis revealed hormone-, stress-, and development-responsive cis-elements, with frequent evolutionary gain and loss.
Orthologous and paralogous DCLs show dissimilar cis-element organization.
Specific microRNAs (ath-miR162, ath-miR414) and critical amino acid sites were implicated in AtDCL1 regulation and functional divergence.

Conclusions:

Plant DCL proteins exhibit specialized roles and regulatory mechanisms tailored to developmental processes and environmental stresses.
Evolutionary analysis of cis-elements and protein sequences provides insights into DCL functional diversification.
Understanding DCL regulation and evolution is crucial for comprehending small RNA pathways in plants.