Genome-Wide Analysis of the ppa Gene Family in Pyrus bretschneideri

Inorganic pyrophosphatases (PPases, EC 3.6.1.1) catalyze the hydrolysis of the phosphoanhydride bond in inorganic pyrophosphate (PPi), a compound produced in various reversible nucleoside 5P-triphosphate-dependent reactions. Theseproteins play an important role in cell anabolism, providing a thermodynamic sink for biosynthetic reactions such as protein, RNA, and DNA syntheses. At present, the genomes of Chinese white pear (‘Dangshansuli’)  has been fully sequenced. However,information about the ppa gene family in this species is limited, and the evolutionary history of the ppa gene family also remains unresolved.In this study, 13 ppa genes were identified from Pyrus bretschneideri. Based on the structural characteristics and phylogenetic analysis of these sequences, the ppa family genes could be classified into two main groups (classes Aand B). Segmental and dispersed duplications were the primary forces underlying ppa gene family expansion . Purifying selection also played a critical role in the evolution of Hsf genes. Transcriptome data demonstrated that the expression levels of the ppa genes were widely different. Submitter's E-mail Address: 617627294@qq.com