|Institutional Source||Beutler Lab|
|Gene Name||phosphoinositide kinase, FYVE type zinc finger containing|
|Is this an essential gene?||Essential (E-score: 1.000)|
|Stock #||R1478 (G1)|
|Chromosomal Location||65186683-65278695 bp(+) (GRCm38)|
|Type of Mutation||critical splice donor site (2 bp from exon)|
|DNA Base Change (assembly)||T to C at 65262977 bp (GRCm38)|
|Amino Acid Change|
|Ref Sequence||ENSEMBL: ENSMUSP00000095314 (fasta)|
|Gene Model||predicted gene model for transcript(s): [ENSMUST00000081154] [ENSMUST00000097707]|
|Coding Region Coverage||
FUNCTION: [Summary is not available for the mouse gene. This summary is for the human ortholog.] Phosphorylated derivatives of phosphatidylinositol (PtdIns) regulate cytoskeletal functions, membrane trafficking, and receptor signaling by recruiting protein complexes to cell- and endosomal-membranes. Humans have multiple PtdIns proteins that differ by the degree and position of phosphorylation of the inositol ring. This gene encodes an enzyme (PIKfyve; also known as phosphatidylinositol-3-phosphate 5-kinase type III or PIPKIII) that phosphorylates the D-5 position in PtdIns and phosphatidylinositol-3-phosphate (PtdIns3P) to make PtdIns5P and PtdIns(3,5)biphosphate. The D-5 position also can be phosphorylated by type I PtdIns4P-5-kinases (PIP5Ks) that are encoded by distinct genes and preferentially phosphorylate D-4 phosphorylated PtdIns. In contrast, PIKfyve preferentially phosphorylates D-3 phosphorylated PtdIns. In addition to being a lipid kinase, PIKfyve also has protein kinase activity. PIKfyve regulates endomembrane homeostasis and plays a role in the biogenesis of endosome carrier vesicles from early endosomes. Mutations in this gene cause corneal fleck dystrophy (CFD); an autosomal dominant disorder characterized by numerous small white flecks present in all layers of the corneal stroma. Histologically, these flecks appear to be keratocytes distended with lipid and mucopolysaccharide filled intracytoplasmic vacuoles. Alternative splicing results in multiple transcript variants encoding distinct isoforms.[provided by RefSeq, May 2010]
PHENOTYPE: Mice homozygous for a null allele die prior to implantation with reduced numbers of inner cell mass and trophectoderm cells and blastocoele abnormalities. Mice homozygous for a second null allele show embryonic lethality between somite formation and embryo turning with abnormal visceral endoderm. [provided by MGI curators]
|Allele List at MGI|
|Other mutations in this stock||
|Other mutations in Pikfyve||
(F):5'- GGGAGGCATTCTCTGAGGGTTAGAAAA -3'
(R):5'- GCCATGCATCATCCCATTGTTAAAGC -3'
(F):5'- ataaaagtgacagacagtgacaag -3'
(R):5'- GGTTTCTATCTAAAGAGCCCCAA -3'