Human phospholipases A2: a functional and evolutionary analysis

Area of Science:

• Genomics
• Molecular Biology
• Biochemistry

Background:

• Phospholipases A2 (PLA2) are crucial enzymes involved in lipid metabolism, membrane homeostasis, and inflammatory responses.
• Dysregulation of PLA2-mediated lipid metabolism is implicated in various human diseases.
• Understanding the human PLA2 gene superfamily is essential for deciphering their roles in health and disease.

Purpose of the Study:

• To systematically identify and characterize all 29 human Phospholipases A2 (PLA2) genes.
• To analyze the genomic localization, mutation tolerance, disease associations, and evolutionary relationships of PLA2 genes.
• To identify specific PLA2 types and associated disease groups for potential therapeutic targeting.

Main Methods:

• Systematic literature and sequence analyses for PLA2 gene identification and characterization.
• Genomic localization mapping and analysis of Retinal Variation Index (RVI) scores for mutation tolerance.
• Literature-based association analysis between PLA2 genes and human diseases, alongside phylogenetic analysis.

Main Results:

• 29 human PLA2 genes were identified, located on 12 chromosomes, with some forming clusters.
• G4-type PLA2 genes within large clusters showed the highest tolerance to mutations, while G6-type PLA2 genes outside clusters had reduced tolerance.
• 24 PLA2 genes are associated with 119 diseases across 18 groups, with G4, G2, and G7 types involved in the most diseases, particularly neoplasms, circulatory, and endocrine system diseases.

Conclusions:

• Human PLA2 genes exhibit diverse genomic organization, mutation tolerance, and disease associations.
• G4, G2, and G7 PLA2 types are significantly linked to a broad spectrum of human diseases.
• Phylogenetic analysis reveals distinct evolutionary paths for different PLA2 subfamilies, with secretory PLA2s sharing a common origin.