Genome-Wide Identification and Expression Analysis of SNAP Gene Family in Wheat

<b>Background/Objectives</b>: The <i>SNAP</i> gene family is a class of proteins containing a SNAP domain, which plays a crucial role in the growth and development of plants. <b>Methods</b>: Bioinformatics methods were used to systematically analyze the gene structure, phylogenetic evolution, chromosomal distribution, physicochemical properties, conserved motifs, and cis-acting elements of the <i>TaSNAP</i> family members. <b>Results</b>: The <i>TaSNAP</i> family comprises members that encode proteins ranging between 120 and 276 amino acids, with isoelectric points spanning from 4.87 to 7.92. Phylogenetic analysis elucidated the categorization of the eight <i>TaSNAP</i> into three distinct subfamilies, wherein members of the same subfamily display marked similarities in their gene structures. Chromosomal mapping revealed the distribution of <i>TaSNAP</i> family members across chromosomes 2A, 2B, 2D, 7A, 7B, and 7D. Utilizing the Plant CARE tool, we identified ten elements linked to plant hormones and four associated with stress responses. Expression analysis via qRT-PCR was performed to assess the levels of the eight <i>TaSNAP</i> genes in various tissues and under diverse abiotic stress conditions. The results indicated heightened expression of most genes in roots compared to spikes. Notably, under ABA stress, the majority of genes exhibited upregulation, whereas certain genes were downregulated under PEG stress, implying a substantial role for SNAP protein in wheat growth and development. <b>Conclusions</b>: This study conducted a comprehensive bioinformatics analysis of each member of the wheat <i>SNAP</i> family, laying a crucial foundation for future functional investigations.