Hyaluronidase-2 is a multifunctional protein, previously thought to only possess acid-active hyaluronan-degrading enzymatic function. In humans it is encoded by the HYAL2 gene. [5] [6] [7]
This gene encodes a protein which is similar in structure to hyaluronidases. Hyaluronidases intracellularly degrade hyaluronan, one of the major glycosaminoglycans of the extracellular matrix. Hyaluronan is thought to be involved in cell proliferation, migration and differentiation.
Varying functions have been described for this protein. It has been described as a lysosomal hyaluronidase which is active at a pH below 4 and specifically hydrolyzes high molecular weight hyaluronan. It has also been described as a GPI-anchored cell surface protein which does not display hyaluronidase activity but does serve as a receptor for the oncogenic virus Jaagsiekte sheep retrovirus. The gene is one of several related genes in a region of chromosome 3p21.3 associated with tumor suppression. This gene encodes two alternatively spliced transcript variants which differ only in the 5' UTR. [7]
One study found associations between cleft lip and palate and mutations in the HYAL2 gene. [8]
An investigation published in 2017, attributed an additional function to the Hyaluronidase 2 (HYAL2) protein. The study found interactions between HYAL2 and proteins involved in the alternative splicing of CD44 pre-mRNA. [9] Another study published in 2020, described roles for HYAL2 in the orchestration of cytoskeletal components involved in myofibroblast contraction. [10] These recent discoveries suggest a broader regulatory role for the HYAL2 protein in cell biology.
An oncogene is a gene that has the potential to cause cancer. In tumor cells, these genes are often mutated, or expressed at high levels.
Jaagsiekte sheep retrovirus (JSRV) is a betaretrovirus which is the causative agent of a contagious lung cancer in sheep, called ovine pulmonary adenocarcinoma.
Macrophage-stimulating protein receptor is a protein that in humans is encoded by the MST1R gene. MST1R is also known as RON kinase, named after the French city in which it was discovered. It is related to the c-MET receptor tyrosine kinase.
Hyaluronidase-1 is an enzyme that in humans is encoded by the HYAL1 gene.
RNA-binding protein 5 is a protein that in humans is encoded by the RBM5 gene.
Zinc finger MYND domain-containing protein 10 is a protein that in humans is encoded by the ZMYND10 gene.
Semaphorin-3B is a protein that in humans is encoded by the SEMA3B gene.
Sodium-coupled neutral amino acid transporter 3 is a protein that in humans is encoded by the SLC38A3 gene.
MAP kinase-activated protein kinase 3 is an enzyme that in humans is encoded by the MAPKAPK3 gene.
Large tumor suppressor kinase 2 (LATS2) is an enzyme that in humans is encoded by the LATS2 gene.
Receptor-type tyrosine-protein phosphatase gamma is an enzyme that in humans is encoded by the PTPRG gene.
Hyaluronidase PH-20 is an enzyme that in humans is encoded by the SPAM1 gene.
CTD small phosphatase-like protein is an enzyme that in humans is encoded by the CTDSPL gene.
RNA-binding protein 6 is a protein that in humans is encoded by the RBM6 gene. RBM6 orthologs have been identified in all mammals for which complete genome data are available.
Nitrogen permease regulator 2-like protein (NPRL2) also known as tumor suppressor candidate 4 (TUSC4) is a protein that in humans is encoded by the NPRL2 gene.
Tumor suppressor candidate 2 is a protein that in humans is encoded by the TUSC2 gene.
Hyaluronidase-3 is an enzyme that in humans is encoded by the HYAL3 gene.
Voltage-dependent calcium channel subunit alpha2delta-2 is a protein that in humans is encoded by the CACNA2D2 gene.
N-acetyltransferase 80 is a protein that in humans is encoded by the NAA80 gene. It acetylates the N-terminus of mature actin.
The enzootic nasal tumor virus of the betaretrovirus genus is a carcinogenic retrovirus that causes enzootic nasal adenocarcinoma in sheep and goats. Strain ENTV-1 is found in sheep and strain ENTV-2 is found in goats. The virus causes tumor growth in the upper nasal cavity and is closely related to JSRV which also causes respiratory tumors in ovine. The disease, enzootic nasal adenocarcinoma is common in North America and is found in sheep and goats on every continent except New Zealand and Australia. There are more than 27 betaretroviruses similar to ENVT and JSRV in the ovine genome. In the future, research on ENTV may become important in studying viruses that cause human lung cancer.
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