MtSSPdb: The Medicago truncatula Small Secreted Peptide Database

Area of Science:

• Plant molecular biology
• Genomics
• Bioinformatics

Background:

• Small secreted peptides (SSPs) are key regulators in plant growth, development, reproduction, stress, and defense.
• SSPs are crucial for legume root nodule development.
• SSP-encoding genes are often missed by standard genome annotation due to small open reading frames and low/specific expression.

Purpose of the Study:

• To support the systematic characterization and annotation of small secreted peptide (SSP)-encoding genes in Medicago truncatula.
• To provide a comprehensive resource for plant SSP research.

Main Methods:

• Identification of 4,439 SSP-encoding genes in Medicago truncatula.
• Development of the Medicago truncatula Small Secreted Peptide Database (MtSSPdb).
• Integration of an RNA-sequencing-based gene expression atlas with analytical tools (differential expression, coexpression, pathway enrichment).
• Inclusion of an online SSP prediction tool and data from synthetic peptide screens.

Main Results:

• MtSSPdb hosts a compendium of Medicago truncatula SSP candidates with functional and family annotations.
• The database includes a large-scale gene expression atlas with advanced analytical capabilities.
• An online tool for genome-scale SSP prediction is available.
• Data from synthetic peptide screens, including root and nodule phenotyping, are integrated.

Conclusions:

• MtSSPdb is a unique and valuable resource for the plant research community.
• The database facilitates systematic characterization and annotation of plant SSPs.
• MtSSPdb has the potential to become the most complete database for plant SSPs globally.