Human Contactin-4 Isoform a Antibody Summary
Asp19-Gly1001
Accession # Q8IWV2
Applications
Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.
Reconstitution Calculator
Preparation and Storage
- 12 months from date of receipt, -20 to -70 °C as supplied.
- 1 month, 2 to 8 °C under sterile conditions after reconstitution.
- 6 months, -20 to -70 °C under sterile conditions after reconstitution.
Background: Contactin-4
Contactin-4 (CNTN4), also known as BIG-2 (Brain-derived Immunoglobulin Superfamily molecule 2), is an axonal cell adhesion molecule that belongs to the contactin family, a subfamily of the Ig superfamily (1‑3). The contactin family comprises six members (CNTN1/F3, CNTN2/TAG-1, CNTN3/BIG-1, CNTN4/BIG-2, CNTN5/NB-2 and CNTN6/NB-3) and are characterized by the presence of six Ig-like domains, four fibronectin type III-like repeats, and a glycosylphosphatidylinositol (GPI)‑anchoring domain. Contactin family proteins exist as membrane-bound proteins, but can also be released as soluble proteins by GPI‑specific phospholipase D. Soluble Contactins are functionsl proteins that are able to promote neurite outgrowth. Human CNTN4 has been mapped to chromosome 3p26‑p25. Three alternative transcripts of CNTN4, encoding isoforms a, b, and c precursor proteins containing 1026, 282, and 698 amino acid (aa) residues, respectively, have been described. Human CNTN4 isoform a shares 94% aa sequence identity with its rat homolog. It also shares from 44‑66% aa sequence identity with other CNTN family members. CNTN family members display overlapping but distinct expression patterns. CNTN4 expression is detected in multiple organs including brains, pancreas, kidney, aorta, small intestine, thyroid, uterus and testis. However, expression of the 282 aa isoform b is primarily restricted to the brain. CNTN4 has been suggested to play important roles in the formation of neuronal networks during nervous sytems development. Disruption of CNTN4 has been implicated in the 3p deletion syndrome characterized by growth failure, developmental delay, and mental retardation. CNTN-4 expression is induced in human neuroblastoma tumor cells treated with retinoic acid and may be responsible for the the neuritogenic response of tumor cells to retinoids. R&D Systems' recombinant CNTN4 shows in vitro neurite outgrowth promoting activity when used as an immobilized substrate for hippocampal neuron outgrowth.
- Fernandez, T. et al. (2004) Am. J. Genet. 74:1286.
- Hasnford, L.M. et al. (2003) Cytogenet. Genome Res. 101:17.
- Yoshihara, Y. et al. (1995) J. Neurobiology 28:51.
Product Datasheets
Citation for Human Contactin-4 Isoform a Antibody
R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.
1 Citation: Showing 1 - 1
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BIG-2 mediates olfactory axon convergence to target glomeruli.
Authors: Kaneko-Goto T, Yoshihara S, Miyazaki H, Yoshihara Y
Neuron, 2008-03-27;57(6):834-46.
Species: Mouse
Sample Types: Whole Tissue
Applications: IHC
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