GO:0006650 glycerophospholipid metabolic process

Glycerophospholipid metabolic process (GO:0006650) encompasses the chemical reactions and pathways involving glycerophospholipids, which are derivatives of glycerophosphate containing at least one O-acyl, O-alkyl, or O-alkenyl group attached to the glycerol residue. These lipids are fundamental components of biological membranes and play critical roles in energy storage, signal transduction, and membrane trafficking. The pathway includes the synthesis, remodeling, and degradation of glycerophospholipids, processes that are highly conserved across bacteria, yeast, and mammals. Researchers study this term to understand how cells allocate resources for membrane assembly, respond to environmental cues, and maintain lipid homeostasis. Dysregulation of glycerophospholipid metabolism is implicated in a wide range of pathologies, including viral infections, metabolic disorders, and cancer. For example, glycerophospholipid remodeling is critical for orthoflavivirus infection, highlighting its role in host-pathogen interactions. In addition, lipid nanoparticle-mediated delivery of CRISPR-Cas9 against Rubicon ameliorates non-alcoholic fatty liver disease (NAFLD) by modulating CD36 along with glycerophospholipid metabolism. These findings underscore the importance of understanding the molecular players and regulatory mechanisms of this pathway. The glycerol-3-phosphate pathway is a central route for glycerophospholipid synthesis, and substrate channeling within this pathway regulates the synthesis, storage, and secretion of glycerolipids. Phospholipase A2 enzymes are key mediators of glycerophospholipid remodeling and generate lysophospholipids and free fatty acids that serve as signaling molecules. Moreover, the Dsc ubiquitin ligase complex identifies transmembrane degrons to degrade orphaned proteins at the Golgi, a process that may intersect with lipid metabolism. Bacterial lipid diversity also reveals the evolutionary conservation and variation of glycerophospholipid metabolic enzymes. This article provides a comprehensive overview of GO:0006650, covering its definition, biological significance, key genes, regulatory mechanisms, disease associations, and research methodologies, with a focus on CRISPR-based approaches for functional genomics.

GO:0006650, glycerophospholipid metabolic process, is defined as the chemical reactions and pathways involving glycerophospholipids, any derivative of glycerophosphate that contains at least one O-acyl, O-alkyl, or O-alkenyl group attached to the glycerol residue. This biological process includes the biosynthesis, remodeling, and degradation of glycerophospholipids such as phosphatidic acid, phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and phosphatidylinositol. The term is synonymous with alpha-glycerophosphate pathway, glycerophospholipid metabolism, phosphoglyceride metabolic process, and phosphoglyceride metabolism. It is a fundamental metabolic process that occurs in all cellular organisms and is essential for membrane integrity, lipid signaling, and energy homeostasis.

Glycerophospholipid metabolic process is fundamentally important because glycerophospholipids are the major structural lipids of biological membranes and serve as precursors for signaling molecules that regulate cell growth, survival, and metabolism. The pathway controls membrane lipid composition, which in turn affects protein function, vesicle trafficking, and organelle identity. Dysregulation of glycerophospholipid metabolism contributes to a variety of human diseases, including viral infections, metabolic disorders such as NAFLD, and cancer. For instance, orthoflaviviruses depend on glycerophospholipid remodeling for efficient replication, and targeting this pathway may offer antiviral strategies. In NAFLD, modulation of glycerophospholipid metabolism along with CD36 ameliorates disease in preclinical models. Furthermore, phospholipase A2 enzymes, which are key players in glycerophospholipid remodeling, are implicated in inflammation and cancer progression. Understanding the regulation and function of this pathway is therefore critical for developing therapeutic interventions and for interpreting genomic and lipidomic data in biomedical research.

The following genes and proteins are key players in glycerophospholipid metabolic process, based on published literature and their roles in synthesis, remodeling, and degradation.

Glycerophospholipid metabolic process is regulated at multiple levels, including transcriptional control of enzyme genes, allosteric regulation by lipid intermediates, and post-translational modifications. The glycerol-3-phosphate pathway is subject to substrate channeling, which ensures efficient flux and prevents toxic intermediate accumulation. Phospholipase A2 enzymes are regulated by calcium, phosphorylation, and interaction with accessory proteins, and their activity is critical for remodeling. In the context of infection, orthoflaviviruses modulate glycerophospholipid remodeling to create favorable replication compartments. Additionally, the Dsc ubiquitin ligase complex identifies transmembrane degrons to degrade orphaned proteins at the Golgi, which may indirectly influence lipid metabolism by maintaining Golgi homeostasis. Metabolic signals such as insulin and nutrient availability also impact glycerophospholipid synthesis, as seen in NAFLD models where Rubicon targeting alters CD36 and glycerophospholipid metabolism.

Glycerophospholipid remodeling is critical for orthoflavivirus infection. Viruses hijack host lipid metabolic pathways to build replication organelles and evade immune detection. Targeting enzymes in this pathway may provide broad-spectrum antiviral strategies. For example, inhibition of phospholipase A2 or acyltransferases could disrupt viral replication.

Dysregulation of glycerophospholipid metabolism contributes to non-alcoholic fatty liver disease (NAFLD). Lipid nanoparticle-mediated delivery of CRISPR-Cas9 against Rubicon ameliorates NAFLD by modulating CD36 along with glycerophospholipid metabolism. This highlights the therapeutic potential of targeting this pathway in metabolic disorders. Additionally, mutations in AGPAT2 and LPIN2 cause lipodystrophy and Majeed syndrome, respectively, underscoring the importance of glycerophospholipid synthesis in human health.

Phospholipase A2 enzymes, which mediate glycerophospholipid degradation, are implicated in cancer progression and neurodegeneration. PLA2G4A promotes inflammation and tumor growth, while PLA2G6 mutations cause neurodegeneration with brain iron accumulation. Remodeling enzymes such as LPCAT1 are overexpressed in various cancers and correlate with poor prognosis. Thus, glycerophospholipid metabolic genes are potential biomarkers and therapeutic targets in oncology and neurology.

Lipidomics using mass spectrometry is the primary method to quantify glycerophospholipid species and their changes in response to genetic or environmental perturbations. It can measure hundreds of lipid species simultaneously and is essential for understanding pathway flux.

CRISPR knockout or activation screens can identify genes that regulate glycerophospholipid metabolism. For example, a screen targeting lipid metabolic enzymes could reveal novel regulators of viral infection or NAFLD.

Fluorescently tagged lipid biosensors and proteins can visualize glycerophospholipid dynamics at the Golgi, ER, and mitochondria. The Dsc complex was studied using tagged knock-in and imaging to track Golgi quality control.

Transcriptomic and proteomic data can be integrated with pathway databases to map glycerophospholipid metabolic networks. Bioinformatics tools help identify enzyme-substrate relationships and regulatory nodes.

Researchers studying glycerophospholipid metabolic process-related genes often need to determine whether a candidate gene is causally involved in lipid synthesis, remodeling, or disease. EDITGENE provides a comprehensive suite of CRISPR-based services to enable precise genetic manipulation and functional interrogation of these genes in relevant cell models.

Glycerophospholipid metabolic process (GO:0006650) is a fundamental biological pathway that governs membrane lipid composition, energy storage, and signaling. Its dysregulation is implicated in viral infections, metabolic diseases such as NAFLD, and cancer. Key enzymes and regulatory mechanisms have been elucidated through decades of research, and CRISPR-based models now enable precise functional interrogation of these genes. Understanding this pathway is essential for developing new therapeutic strategies and for interpreting lipidomic and genomic data in biomedical research.