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PIP5K1C
phosphatidylinositol-4-phosphate 5-kinase type 1 gamma
PIP5K1C is located on the short (p) arm of chromosome 19, at band 19p13.3. Arm ratio per GRCh38 - banding schematic.
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Overview
PIP5K1C belongs to a small family of kinases responsible for generating phosphatidylinositol 4,5-bisphosphate (PIP2) at cellular membranes. This lipid acts as both a structural component of cell membranes and a signalling molecule that coordinates responses to extracellular stimuli. The enzyme converts phosphatidylinositol 4-phosphate (PI4P) into PIP2 by adding a phosphate group at the 5-position of the inositol ring.
Three related genes (PIP5K1A, PIP5K1B, and PIP5K1C) encode distinct type 1 PIP kinases with overlapping but non-redundant functions in human cells. The gamma isoform encoded by PIP5K1C demonstrates tissue-specific expression patterns and may support specialised cellular processes in particular contexts.
What the gene does
The PIP5K1C protein catalyses the phosphorylation of phosphatidylinositol 4-phosphate to produce PIP2, a versatile signalling lipid embedded in cellular membranes. PIP2 serves as a substrate for phospholipase C enzymes, which cleave it to generate second messengers that mobilise intracellular calcium and activate protein kinase C pathways during signal transduction.
Beyond its role as a signalling precursor, PIP2 directly regulates numerous membrane-associated proteins. Research suggests it modulates ion channel activity, influences cytoskeletal dynamics by recruiting actin-binding proteins, and controls membrane trafficking events including endocytosis and exocytosis. The localised production of PIP2 by type 1 PIP kinases creates distinct pools of this lipid at specific membrane sites, enabling spatial control of cellular responses.
The gamma isoform appears to contribute to these processes in a context-dependent manner, though the precise functional distinctions between the three type 1 PIP kinase isoforms remain an active area of investigation.
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Chromosome location
PIP5K1C resides on chromosome 19 at position p13.3, in the short arm of the chromosome. This chromosomal region contains a cluster of genes involved in diverse cellular processes. The genomic structure of PIP5K1C and its detailed exon organisation have not been comprehensively catalogued in standard reference databases.
Protein structure
Domain architecture has not been experimentally characterised in detail for this protein.
Key variants
Genetic variants in PIP5K1C encompass both common polymorphisms present in the general population and rare changes identified through clinical or research sequencing. The inheritance pattern associated with PIP5K1C variants can vary depending on the specific genetic change and its functional consequences. Current evidence does not establish a clear genotype-phenotype correlation for this gene, and the clinical significance of most reported variants remains uncertain.
Sample of pathogenic variants
6 pathogenic / likely-pathogenic variants from ClinVar, ranked by review status (expert-panel-reviewed first). This is a sample; recurrent founder variants in a specific population may not appear here - see the full ClinVar listing via the link above.
| Variant (HGVS) | Protein change | Classification | Evidence | Associated condition |
|---|---|---|---|---|
c.662A>G | p.Tyr221Cys | Pathogenic | ★★☆☆ | Inborn genetic diseases |
c.1127+1G>A | - | Pathogenic | ★☆☆☆ | not provided |
c.625C>T | p.Leu209Phe | Pathogenic | ★☆☆☆ | not provided |
c.688_689del | p.Gly230fs | Pathogenic | ★☆☆☆ | not provided |
c.700C>T | p.Arg234Cys | Pathogenic | ★☆☆☆ | not provided |
c.757G>A | p.Asp253Asn | Pathogenic | - | Lethal congenital contracture syndrome 3 |
Evidence stars indicate ClinVar review status. Individual variant interpretation should always be performed by a qualified clinical laboratory - many variants remain classified as Variants of Uncertain Significance (VUS) pending more research.
Associated conditions
At present, no specific inherited conditions have been definitively linked to pathogenic variants in PIP5K1C in clinical literature. The gene's role in fundamental cellular signalling suggests that complete loss of function might prove incompatible with normal development, whilst more subtle changes could potentially influence cellular processes without causing overt disease. Further research is needed to clarify whether particular PIP5K1C variants contribute to human health conditions.
No disease links recorded for this gene in our reference set.
UK clinical status
Sources: NHS GMS PanelApp · Genomics England PanelApp · NHS National Genomic Test Directory
Frequently asked questions
What does the PIP5K1C gene do?
PIP5K1C encodes an enzyme that produces PIP2, a signalling lipid molecule in cell membranes. PIP2 regulates processes including signal transduction, membrane trafficking, and cytoskeletal organisation across many cell types.
How is PIP5K1C inherited?
The inheritance pattern for PIP5K1C variants varies depending on the specific genetic change. No clear Mendelian inheritance pattern has been established for this gene, as definitive disease associations have not yet been confirmed.
Are there different versions of PIP5K1C in the population?
Yes, like most human genes, PIP5K1C exhibits natural variation across individuals. These variants range from common harmless polymorphisms to rare changes of uncertain significance, though most people carry functional copies of the gene.