Evolution, gene expression profiling and 3D modeling of CSLD proteins in cotton

Area of Science:

• Plant Biology
• Genomics
• Molecular Evolution

Background:

• Cellulose synthase-like D (CSLD) genes, part of the CESA-like superfamily, are crucial for plant cell development.
• Previous research indicated CSLD genes' involvement in tip-growing cells and stem development.
• A genome-wide characterization of CSLD genes in cotton was lacking.

Purpose of the Study:

• To perform a comprehensive genome-wide analysis of CSLD proteins in cotton.
• To investigate the evolutionary history and functional characteristics of cotton CSLD proteins.
• To provide insights into the role of CSLD genes in cotton cell wall biosynthesis.

Main Methods:

• Identification and phylogenetic analysis of 23 full-length CSLD proteins across three cotton species (Gossypium raimondii, G. arboreum, G. hirsutum).
• Transcriptional profiling of GhCSLD genes to determine tissue-specific expression patterns.
• 3D structural modeling of cotton CSLD proteins, including GrCSLD1, to predict functional domains and evolutionary pressures.

Main Results:

• Twenty-three CSLD proteins were identified and classified into five distinct phylogenetic clades.
• GhCSLD genes exhibited varied expression patterns, with CSLD1 and CSLD4 showing high, tissue-specific expression in the androecium & gynoecium.
• Evolutionary analysis revealed positive selection pressures on CSLD1 and CSLD4, with key residues located near functional domains.

Conclusions:

• The study provides a detailed characterization of the cotton CSLD protein family using an integrated approach.
• Findings enhance the understanding of CSLD gene importance in cotton, particularly in reproductive tissues.
• This research serves as a valuable reference for future studies on cell wall biosynthesis and gene selection in cotton.