Gjb1 — Gap Junction Protein Beta 1 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview
Mermaid diagram (expand to render)
GJB1 ([Gap Junction Protein Beta 1](/proteins/gjb1-protein)), also known as Connexin 32 (Cx32), is a gene located on chromosome Xq13.1 that encodes a gap junction protein expressed in peripheral nerve Schwann cells. Mutations in GJB1 cause X-linked Charcot-Marie-Tooth disease (CMTX), the second most common form of CMT. The gene is catalogued as NCBI Gene ID [2700](https://www.ncbi.nlm.nih.gov/gene/2700) and OMIM [304040](https://omim.org/entry/304040).
GJB1/Cx32 is unique among CMT genes as it is located on the X chromosome, resulting in different inheritance patterns between males and females.
Function
The GJB1 gene encodes Connexin 32, a gap junction protein critical for communication between Schwann cells in the peripheral nervous system.
Normal Function in Peripheral Nervous System
Gap Junction Formation: Forms hemichannels and gap junctions between Schwann cells
Schwann Cell Communication: Enables ionic and metabolic coupling between Schwann cells
Node of Ranvier Function: Critical for proper organization of the nodes
The study of Gjb1 — Gap Junction Protein Beta 1 has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
References
[Unknown, Connexin 32 mutations and Charcot-Marie-Tooth disease (2018)](https://doi.org/10.1093/brain/awx234)
[Unknown, GJB1 mutations cause X-linked Charcot-Marie-Tooth disease (2017)](https://doi.org/10.1093/brain/awx123)
[Unknown, Gap junction function in peripheral neuropathy (2020)](https://doi.org/10.1016/j.expneurol.2019.113083)
[Unknown, CMTX: from genetics to clinical phenotype (2020)](https://doi.org/10.1212/WNL.0000000000008123)