Neurogenic locus notch homolog protein 2 (Notch 2) is a protein that in humans is encoded by the NOTCH2 gene. [5]
NOTCH2 is associated with Alagille syndrome [6] and Hajdu–Cheney syndrome. [7]
Notch 2 is a member of the notch family. Members of this type 1 transmembrane protein family share structural characteristics including an extracellular domain consisting of multiple epidermal growth factor-like (EGF) repeats, and an intracellular domain consisting of multiple, different domain types. Notch family members play a role in a variety of developmental processes by controlling cell fate decisions. The Notch signaling network is an evolutionarily conserved intercellular signaling pathway that regulates interactions between physically adjacent cells. In Drosophila , notch interaction with its cell-bound ligands (delta, serrate) establishes an intercellular signaling pathway that plays a key role in development. Homologues of the notch-ligands have also been identified in human, but precise interactions between these ligands and the human notch homologues remain to be determined. This protein is cleaved in the trans-Golgi network, and presented on the cell surface as a heterodimer. This protein functions as a receptor for membrane bound ligands, and may play a role in vascular, renal and hepatic development. [8]
Mutations within the last coding exon of Notch2 that remove the PEST domain and escape the nonsense-mediated mRNA decay have been shown to be the main cause of the Hajdu-Cheney syndrome. [9] [10] [11]
NOTCH2 has been shown to interact with:
Alagille syndrome (ALGS) is a genetic disorder that affects primarily the liver and the heart. Problems associated with the disorder generally become evident in infancy or early childhood. The disorder is inherited in an autosomal dominant pattern, and the estimated prevalence of Alagille syndrome is 1 in every 30,000 to 1 in every 40,000 live births. It is named after the French pediatrician Daniel Alagille, who first described the condition in 1969.
SMAD family member 6, also known as SMAD6, is a protein that in humans is encoded by the SMAD6 gene.
Tyrosine-protein phosphatase non-receptor type 11 (PTPN11) also known as protein-tyrosine phosphatase 1D (PTP-1D), Src homology region 2 domain-containing phosphatase-2 (SHP-2), or protein-tyrosine phosphatase 2C (PTP-2C) is an enzyme that in humans is encoded by the PTPN11 gene. PTPN11 is a protein tyrosine phosphatase (PTP) Shp2.
Neurogenic locus notch homolog protein 3(Notch 3) is a protein that in humans is encoded by the NOTCH3 gene.
Jagged1 (JAG1) is one of five cell surface proteins (ligands) that interact with four receptors in the mammalian Notch signaling pathway. The Notch Signaling Pathway is a highly conserved pathway that functions to establish and regulate cell fate decisions in many organ systems. Once the JAG1-NOTCH (receptor-ligand) interactions take place, a cascade of proteolytic cleavages is triggered resulting in activation of the transcription for downstream target genes. Located on human chromosome 20, the JAG1 gene is expressed in multiple organ systems in the body and causes the autosomal dominant disorder Alagille syndrome (ALGS) resulting from loss of function mutations within the gene. JAG1 has also been designated as CD339.
Proto-oncogene tyrosine-protein kinase Fyn is an enzyme that in humans is encoded by the FYN gene.
Phosphatidylinositol 3-kinase regulatory subunit alpha is an enzyme that in humans is encoded by the PIK3R1 gene.
Neurogenic locus notch homolog protein 1(Notch 1) is a protein encoded in humans by the NOTCH1 gene. Notch 1 is a single-pass transmembrane receptor.
Caspase-10 is an enzyme that, in humans, is encoded by the CASP10 gene.
LIM domain kinase 1 is an enzyme that in humans is encoded by the LIMK1 gene.
Delta-like protein 1 is a protein that in humans is encoded by the DLL1 gene.
Na(+)/H(+) exchange regulatory cofactor NHE-RF3 is a protein that in humans is encoded by the PDZK1 gene.
Transcription factor HES1 is a protein that is encoded by the Hes1 gene, and is the mammalian homolog of the hairy gene in Drosophila. HES1 is one of the seven members of the Hes gene family (HES1-7). Hes genes code nuclear proteins that suppress transcription.
Mitogen-activated protein kinase kinase kinase 10 is an enzyme that in humans is encoded by the MAP3K10 gene.
Protein Wnt-7a is a protein that in humans is encoded by the WNT7A gene.
Jagged-2 is a protein that in humans is encoded by the JAG2 gene.
Beta-1,3-N-acetylglucosaminyltransferase manic fringe is an enzyme that in humans is encoded by the MFNG gene, a member of the fringe gene family which also includes the radical fringe (RFNG) and lunatic fringe (LFNG).
Mastermind-like protein 1 is a protein that in humans is encoded by the MAML1 gene.
Protein deltex-1 is a protein that in humans is encoded by the DTX1 gene.
Notch proteins are a family of type 1 transmembrane proteins that form a core component of the Notch signaling pathway, which is highly conserved in metazoans. The Notch extracellular domain mediates interactions with DSL family ligands, allowing it to participate in juxtacrine signaling. The Notch intracellular domain acts as a transcriptional activator when in complex with CSL family transcription factors. Members of this type 1 transmembrane protein family share several core structures, including an extracellular domain consisting of multiple epidermal growth factor (EGF)-like repeats and an intracellular domain transcriptional activation domain (TAD). Notch family members operate in a variety of different tissues and play a role in a variety of developmental processes by controlling cell fate decisions. Much of what is known about Notch function comes from studies done in Caenorhabditis elegans (C.elegans) and Drosophila melanogaster. Human homologs have also been identified, but details of Notch function and interactions with its ligands are not well known in this context.