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TBCB
tubulin folding cofactor B
TBCB is located on the long (q) arm of chromosome 19, at band 19q13.12. Arm ratio per GRCh38 - banding schematic.
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Overview
TBCB is located on chromosome 19 and encodes a protein that serves as a molecular chaperone for tubulin. Microtubules are essential components of the cytoskeleton, the internal scaffolding that gives cells their shape and facilitates numerous cellular processes. Without correctly folded tubulin subunits, cells cannot assemble functional microtubules, which would impair fundamental activities including chromosome segregation during cell division and the movement of organelles within cells. The TBCB protein works alongside other tubulin-specific chaperones to ensure that alpha- and beta-tubulin monomers achieve their native conformations before they can polymerise into microtubule structures.
What the gene does
Tubulin folding cofactor B acts as a specialised chaperone dedicated to the folding pathway of tubulin proteins. Newly translated tubulin chains emerge from ribosomes in an unfolded state and require a series of chaperone-assisted steps to reach their functional configuration. TBCB binds to tubulin intermediates during this maturation process, preventing aggregation and guiding the polypeptide towards its correct tertiary structure. The protein participates in a multi-step pathway involving several cofactors, each contributing to different stages of tubulin folding. Once tubulin subunits are properly folded, they can associate with one another to form the building blocks of microtubules. These dynamic polymers are critical for mitosis, where they form the spindle apparatus that separates chromosomes, and for maintaining the structural integrity of neurons and other cell types with elaborate shapes.
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Chromosome location
The TBCB gene is situated at chromosomal band 19q13.12 on the long arm of chromosome 19. This region of the genome contains numerous genes involved in cellular housekeeping functions. The precise exon structure and transcript variants of TBCB contribute to the regulated expression of the tubulin folding cofactor in different tissues.
Protein structure
Domain architecture has not been experimentally characterised in detail for this protein.
Key variants
Genetic variants in TBCB can affect the efficiency of tubulin folding, potentially disrupting microtubule dynamics. Because tubulin is a ubiquitous and essential component of all eukaryotic cells, changes that impair TBCB function may have wide-ranging cellular consequences. The variant landscape includes both rare and common polymorphisms, though the clinical significance of most variants remains under investigation.
No pathogenic or likely-pathogenic ClinVar variants recorded yet for this gene.
Associated conditions
Currently, TBCB is not strongly associated with specific well-characterised inherited conditions in clinical databases. Research continues to explore whether rare pathogenic variants in this gene contribute to developmental or neurological phenotypes, given the central role of microtubules in nervous system function and cell division. As the understanding of tubulin chaperone biology advances, clearer genotype-phenotype correlations may emerge.
No disease links recorded for this gene in our reference set.
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Frequently asked questions
What does tubulin folding cofactor B do in cells?
Tubulin folding cofactor B helps newly made tubulin proteins fold into their correct shapes, which is necessary for building microtubules. Microtubules form the structural framework of cells and enable processes such as cell division and intracellular transport.
Where is the TBCB gene located?
The TBCB gene is located on chromosome 19 at band 19q13.12, a region that contains many genes involved in essential cellular functions.
Are there known inherited conditions linked to TBCB?
At present, TBCB is not strongly associated with specific well-characterised inherited conditions in clinical databases. Research is ongoing to determine whether rare variants in this gene contribute to developmental or neurological disorders.