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TRAPPC6B
trafficking protein particle complex subunit 6B
TRAPPC6B is located on the long (q) arm of chromosome 14, at band 14q21.1. Arm ratio per GRCh38 - banding schematic.
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Overview
TRAPPC6B (trafficking protein particle complex subunit 6B) is a gene located on chromosome 14 that encodes a protein involved in intracellular transport. The TRAPP complex acts as a tethering factor, helping vesicles - small membrane-bound compartments - dock at the right cellular destinations before fusion. This trafficking system is essential for maintaining the organisation of membrane-bound compartments within cells and ensuring that newly synthesised proteins reach their intended locations.
Whilst TRAPPC6B is part of a larger family of TRAPP subunits, its specific contribution to complex assembly and function remains an area of ongoing research. The gene is expressed across various tissues, reflecting the fundamental importance of vesicle transport in all cell types.
What the gene does
The protein encoded by TRAPPC6B is a component of the TRAPP (transport protein particle) complex, a multi-subunit assembly that facilitates vesicle trafficking along the secretory and endocytic pathways. TRAPP complexes function as guanine nucleotide exchange factors, activating small GTPases of the Rab family that regulate membrane fusion events. By recruiting and activating these molecular switches, the complex coordinates the docking and fusion of transport vesicles with target membranes.
TRAPPC6B contributes to the structural integrity of specific TRAPP isoforms, which differ in their subunit composition and cellular roles. Some TRAPP complexes operate at the endoplasmic reticulum and Golgi apparatus, supporting the early secretory pathway, whilst others function in autophagy - the process by which cells break down and recycle damaged components. The precise biochemical role of TRAPPC6B within these assemblies is still being characterised, though evidence suggests it may influence complex stability and substrate specificity.
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Chromosome location
TRAPPC6B is located on the long arm of chromosome 14 at position 21.1 (14q21.1). This chromosomal region contains a cluster of genes with diverse cellular functions. Detailed information about the gene's exon-intron structure and transcript variants has not been fully catalogued in public databases.
Protein structure
Domain architecture has not been experimentally characterised in detail for this protein.
Key variants
Genetic variation in TRAPPC6B has been identified through sequencing studies, though the clinical significance of most variants remains uncertain. Because the gene encodes a component of a multi-subunit complex, changes that disrupt protein folding, stability, or interaction with other TRAPP subunits could theoretically affect cellular trafficking pathways. The inheritance pattern associated with TRAPPC6B-related findings varies depending on the specific genetic change and its functional impact.
Sample of pathogenic variants
8 pathogenic / likely-pathogenic variants from ClinVar, ranked by review status (expert-panel-reviewed first). This is a sample; recurrent founder variants in a specific population may not appear here - see the full ClinVar listing via the link above.
| Variant (HGVS) | Protein change | Classification | Evidence | Associated condition |
|---|---|---|---|---|
c.124C>T | p.Arg42Ter | Pathogenic | ★★☆☆ | Neurodevelopmental disorder with microcephaly, epilepsy, and brain atrophy |
c.82-2A>G | - | Pathogenic | ★★☆☆ | Neurodevelopmental disorder with microcephaly, epilepsy, and brain atrophy |
c.91C>T | p.Arg31Ter | Pathogenic/Likely pathogenic | ★★☆☆ | Inborn genetic diseases |
GRCh37/hg19 14q21.1(chr14:39613656-39643762)x1 | - | Pathogenic | ★☆☆☆ | not specified |
c.120dup | p.Phe41fs | Pathogenic | ★☆☆☆ | not provided |
c.283C>T | p.Gln95Ter | Pathogenic | ★☆☆☆ | not provided |
c.29del | p.Leu10fs | Pathogenic | ★☆☆☆ | Neurodevelopmental disorder with microcephaly, epilepsy, and brain atrophy |
c.150-2A>G | - | Pathogenic | - | Neurodevelopmental disorder with microcephaly, epilepsy, and brain atrophy |
Evidence stars indicate ClinVar review status. Individual variant interpretation should always be performed by a qualified clinical laboratory - many variants remain classified as Variants of Uncertain Significance (VUS) pending more research.
Associated conditions
At present, TRAPPC6B is not firmly established as a cause of a specific inherited condition in clinical practice. Research into TRAPP complex components continues to explore potential links between dysfunction in vesicle trafficking and various cellular processes, but definitive disease associations for TRAPPC6B have not been comprehensively documented in the medical literature.
No disease links recorded for this gene in our reference set.
UK clinical status
Sources: NHS GMS PanelApp · Genomics England PanelApp · NHS National Genomic Test Directory
Frequently asked questions
What does the TRAPPC6B protein do?
TRAPPC6B encodes a subunit of the TRAPP complex, which helps vesicles deliver their cargo to the correct destinations within cells. This trafficking process is essential for maintaining cellular organisation and function.
Where is the TRAPPC6B gene located?
The gene is located on chromosome 14 at position 14q21.1.
Are variants in TRAPPC6B linked to specific health conditions?
Currently, TRAPPC6B is not established as a cause of a defined inherited condition. Research into TRAPP complex function is ongoing, and the clinical significance of most TRAPPC6B variants remains uncertain.