Human IFT81 (Q8WYA0): functional annotation and research report Falcon Edison Scientific Literature 31 citations 2 artifacts 2026-10-03T22:03:39.461737

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Human IFT81 (Q8WYA0): functional annotation and research report

Identity and principal function

Identity verified. The specified human gene IFT81, also called CDV1, encodes intraflagellar transport protein 81, a conserved component of the IFT-B complex. Human genetic studies explicitly identify IFT81/CDV1 as an IFT-B core gene, and experimental work identifies its N-terminal calponin-homology (CH) fold and IFT74-binding coiled coils. These observations agree with the supplied UniProt accession Q8WYA0 and IFT81-family/domain annotations; the findings below concern human IFT81 unless an orthologue is explicitly identified. The historical name “carnitine deficiency-associated protein expressed in ventricle 1” does not establish a carnitine-transport or metabolic function: the direct functional evidence instead concerns ciliary transport. (bhogaraju2013molecularbasisof pages 1-3, perrault2015ift81encodingan pages 1-2, petriman2022biochemicallyvalidatedstructural pages 4-6, perrault2015ift81encodingan pages 4-4)

Functional conclusion: IFT81 is principally a structural scaffold and tubulin-cargo-binding subunit of IFT-B, not a membrane transporter, the force-producing motor, or an enzyme that modifies tubulin. Together with IFT74, it helps assemble IFT particles and load soluble αβ-tubulin heterodimers for delivery toward the ciliary tip, where tubulin is needed to build and maintain the microtubule axoneme. IFT81–IFT74 also supplies a binding platform that regulates the ciliary-entry GTPase RabL2; this latter activity belongs to the complex, not necessarily to isolated IFT81. (bhogaraju2013molecularbasisof pages 1-3, bhogaraju2013molecularbasisof pages 3-4, petriman2022biochemicallyvalidatedstructural pages 4-6, boegholm2023theift81‐ift74complex pages 1-2)

Molecular mechanism and substrate specificity

The N-terminal CH domain of human IFT81 contacts the globular portion of soluble αβ-tubulin through a conserved positively charged surface. The highly basic N terminus of its partner IFT74 additionally contacts the acidic β-tubulin C-terminal tail, increasing the complex’s tubulin affinity. Using recombinant human proteins and bovine tubulin, Bhogaraju and colleagues measured dissociation constants of 16 µM for IFT81’s N-terminal domain and 0.9 µM for the IFT74–IFT81 module; mutation of human IFT81 Lys73/Lys75 weakened binding to 187 µM. Removing tubulin’s acidic tails did not substantially impair IFT81-domain binding, whereas removal of the β-tubulin tail eliminated detectable IFT74–IFT81 microtubule binding in the reported assay. This establishes tubulin, rather than carnitine or a signaling ligand, as the experimentally characterized cargo; it does not establish recognition of every tubulin isotype equally. (bhogaraju2013molecularbasisof pages 1-3, bhogaraju2013molecularbasisof pages 4-8, bhogaraju2013molecularbasisof media 6e2b7ebd)

The biochemical distinction matters in cells. Depleting IFT81 in human RPE-1 cells strongly reduced primary-cilium formation; siRNA-resistant wild-type IFT81 restored it, whereas a mutant disrupting the full tubulin-binding patch failed to rescue. An N-terminal deletion or partially binding-defective mutant rescued incompletely, although N-terminally truncated IFT81 could still enter the cilium. Thus, loss of tubulin loading can impair ciliogenesis without necessarily preventing IFT81’s own recruitment into the transport machinery. In Trypanosoma, disruption of the homologous CH domain did not measurably change the mutant protein’s IFT speed, an orthologue-based result that further separates cargo binding from the basic movement of the scaffold. (bhogaraju2013molecularbasisof pages 3-4, bhogaraju2013molecularbasisof pages 1-3)

IFT81’s extended coiled-coil region heterodimerizes with IFT74 to organize other IFT-B components. A 2022 model of reconstituted Chlamydomonas IFT-B, tested against cross-linking, binding, structural and mutational data, places IFT22 near one portion of the IFT81–IFT74 scaffold and IFT27–IFT25 nearer its C terminus. The structure is flexible, and the authors found evidence for alternative placements of IFT81–IFT74 within IFT-B; precise conformations in human cilia should therefore not be presented as fully resolved. (petriman2022biochemicallyvalidatedstructural pages 1-2, petriman2022biochemicallyvalidatedstructural pages 4-6)

A distinct 2023 biochemical finding is that the IFT81–IFT74 scaffold helps turn off RabL2, a small GTPase involved in initiating IFT. In reconstituted Chlamydomonas complexes, GTP-bound RabL2 bound IFT-B1 with a reported Kd of 0.59 µM; the complex increased RabL2 GTP-hydrolysis activity by approximately sevenfold after accounting for background activity. A short IFT81–IFT74 coiled-coil fragment retained RabL2 binding and stimulated hydrolysis approximately threefold; the algal fragment also increased human RabL2B hydrolysis approximately fivefold. Structural models and cross-links place RabL2 against the IFT81–IFT74 coiled coils, providing an explanation for RabL2 release after departure from the ciliary base. This is an unconventional GTPase-activating-protein-like activity of the heterodimer/IFT-B1, not evidence that IFT81 hydrolyzes GTP itself. Human-cell experiments altering IFT74, rather than IFT81, corroborated the importance of this interface for RabL2 localization and ciliary IFT-particle entry; the complete human heterodimer’s catalytic effect was not established by those cell experiments. (boegholm2023theift81‐ift74complex pages 5-7, boegholm2023theift81‐ift74complex pages 7-9, boegholm2023theift81‐ift74complex pages 10-11)

Cellular location and pathways

Human IFT81 is observed at the primary-cilium base and tip and, less prominently, along the axoneme. Tagged full-length protein and a CH-domain deletion both reached primary-cilium tips in human RPE-1 cells; endogenous protein remained enriched at the base and tip in patient fibroblasts carrying one C-terminal variant. These data place its established activity at the basal-body/ciliary-entry region and inside the cilium, as part of IFT particles associated with axonemal microtubules—not as a demonstrated transporter across the ciliary membrane. (bhogaraju2013molecularbasisof pages 1-3, perrault2015ift81encodingan pages 4-4)

The broader pathway is bidirectional intraflagellar transport. Kinesin-2 moves anterograde IFT trains from base to tip; dynein-2 powers their return. IFT-B provides a major scaffold for the trains and cargo carriage, while IFT-A collaborates in ciliary trafficking. Accordingly, calling IFT81 an “anterograde IFT-B component” describes its central assembly and cargo role, not an intrinsic kinesin motor activity or evidence that IFT81 cannot travel on returning particles. In situ cryo-electron tomography of Chlamydomonas reported a 6-nm IFT-B repeat, neighboring-repeat contacts and flexible connections to IFT-A. This is compelling structural context but is algal, rather than a direct image of human IFT81 in a human cilium. (petriman2022biochemicallyvalidatedstructural pages 1-2, boegholm2023theift81‐ift74complex pages 1-2, lacey2023themolecularstructure pages 1-2)

IFT81 also influences cilium-dependent Hedgehog signaling indirectly through ciliary architecture and trafficking. In human IFT81-mutant chondrocytes, altered processing of GLI3—the ratio of its full-length and repressor forms—provides a relatively specific signaling readout relevant to skeletal development. Another patient-derived fibroblast line showed elevated GLI2 mRNA after Smoothened agonist, but not parallel increases in every tested Hedgehog-pathway transcript. Neither result demonstrates that IFT81 directly binds Hedgehog ligand, Smoothened or GLI proteins. (duran2016destabilizationofthe pages 4-7, duran2016destabilizationofthe pages 3-4, perrault2015ift81encodingan pages 4-4)

Human disease evidence and real-world use

Human biallelic IFT81 variants are associated with rare ciliopathy presentations, notably nephronophthisis with polydactyly and a spectrum of short-rib skeletal ciliopathies/asphyxiating thoracic dystrophy. In a 2015 screen of 1,628 individuals with suspected ciliopathy, Perrault and colleagues identified homozygous c.1188+1G>A in a child with nephronophthisis and postaxial foot polydactyly. They also found c.2015_2019del, p.Asp672Alafs*15, predicted to extend IFT81’s C terminus by 10 residues, in another individual. That second patient’s fibroblasts were ciliated at 69.9% versus 83.9% in controls (p = 0.000026) and showed increased agonist-stimulated GLI2 expression. Interpretive qualification: this individual also had biallelic disease-associated PPT1 variants and markedly reduced PPT1 enzyme activity; the retinal and neurological findings cannot confidently be assigned to IFT81 alone. (perrault2015ift81encodingan pages 3-3, perrault2015ift81encodingan pages 3-4, perrault2015ift81encodingan pages 4-4)

In a separate 2016 study, Duran and colleagues examined individuals with biallelic IFT81 variants and skeletal disease. Patient-derived chondrocytes had severely reduced IFT81 and reduced abundance of other IFT-B components, including IFT74, IFT52 and IFT88, whereas the kinesin subunit KIF3A was not comparably reduced. The fraction of ciliated cells was not significantly changed in the reported comparison, but their cilia were unusually long and variable; GLI3 processing was altered, and re-expression of wild-type IFT81 partially corrected measured phenotypes. The contrasting short-cilium/fewer-ciliated-cell result in the 2015 fibroblast line underscores allele- and cell-context dependence, not a universal prediction that every IFT81 variant lengthens cilia. (duran2016destabilizationofthe pages 4-7, duran2016destabilizationofthe pages 3-4, perrault2015ift81encodingan pages 4-4)

Current application is principally molecular diagnosis and functional interpretation: IFT81 can be assessed in sequencing studies of appropriate renal, skeletal or multisystem ciliopathy phenotypes, and suspected variants can be investigated using ciliation, ciliary-length, IFT-B protein-stability and GLI-processing assays. These are research and diagnostic applications, not an established IFT81-targeted treatment. A pertinent 2023 study of IFT74 variants in humans and mice independently supports the physiological importance of the shared IFT74–IFT81 tubulin-binding module, but those cases must not be misreported as IFT81-mutant patients. (perrault2015ift81encodingan pages 3-3, duran2016destabilizationofthe pages 4-7, bakey2023ift74variantscause pages 1-2)

The following evidence matrix distinguishes human experiments from inference based on conserved organisms and lists publication dates and source URLs.

Molecular or clinical finding Key experimental finding Species and inference boundary Dated source and DOI
IFT81–IFT74 binds tubulin cargo Recombinant human IFT81 N-terminal calponin-homology domain bound αβ-tubulin with Kd = 16 µM. The human IFT74–IFT81 module bound approximately 18-fold more tightly (Kd = 0.9 µM); neutralizing IFT81 Lys73/Lys75 weakened affinity to Kd = 187 µM. IFT81 recognizes globular tubulin, whereas basic IFT74 contacts the acidic β-tubulin tail. (bhogaraju2013molecularbasisof pages 4-8, bhogaraju2013molecularbasisof pages 1-3, bhogaraju2013molecularbasisof media 6e2b7ebd) Direct human-protein evidence, using recombinant human proteins and bovine tubulin. Supports soluble αβ-tubulin as cargo; IFT81 is not an enzyme or membrane transporter. Bhogaraju et al., Science, 30 Aug 2013. doi:10.1126/science.1240985
Tubulin binding is required for human ciliogenesis IFT81 depletion strongly reduced ciliated human RPE-1 cells. siRNA-resistant wild-type IFT81 rescued ciliogenesis; ΔN and partially binding-defective constructs gave incomplete rescue, while a mutant disrupting the entire tubulin-binding patch failed to rescue. Full-length and ΔN IFT81 still reached the ciliary tip, separating cargo binding from IFT81's own ciliary trafficking. (bhogaraju2013molecularbasisof pages 1-3, bhogaraju2013molecularbasisof pages 3-4) Direct human-cell evidence. Demonstrates that the N-terminal cargo-binding module is functionally required, but does not show that IFT81 itself supplies motor force. Bhogaraju et al., Science, 30 Aug 2013. doi:10.1126/science.1240985
IFT81–IFT74 is an IFT-B scaffold A biochemically validated model of the 15-subunit IFT-B complex placed IFT81–IFT74 as a flexible heterodimeric scaffold containing about 10 parallel coiled-coil segments; it binds IFT22 near coiled-coil VI, IFT27–IFT25 near coiled-coils VIII–IX, and links to other IFT-B components. Validation included cross-linking mass spectrometry, solution scattering, crystallography, mutagenesis, and binding assays. (petriman2022biochemicallyvalidatedstructural pages 1-2, petriman2022biochemicallyvalidatedstructural pages 4-6) Primarily recombinant Chlamydomonas reinhardtii architecture plus computational modeling. Strong evidence for conserved organization, but exact human conformations remain inferred. Petriman et al., The EMBO Journal, 10 Nov 2022. doi:10.15252/embj.2022112440
Position in polymeric anterograde IFT trains In situ cryo-electron tomography modeled Chlamydomonas IFT-B as a polymer with a 6-nm repeat; neighboring repeats cooperatively stabilize train conformation. IFT-A has an approximately 11.5-nm repeat, giving an approximate 2:1 IFT-B:IFT-A relationship. (lacey2023themolecularstructure pages 1-2, ishikawa2023mass‐speccryo‐emand pages 1-3) Direct algal in situ structural evidence, not direct visualization of human IFT81. Subunit assignment combines approximately 10–18 Å cryo-ET maps with AlphaFold predictions, so atomic details and human equivalence require caution. Lacey, Foster and Pigino, Nature Structural & Molecular Biology, online 5 Jan 2023. doi:10.1038/s41594-022-00905-5
RabL2 recruitment and GTPase activation GTP-bound RabL2 bound the IFT-B1 complex with Kd = 0.59 µM. Incorporation into IFT-B1 increased RabL2 GTP hydrolysis approximately 7-fold after background correction; an approximately 70-residue IFT81–IFT74 coiled coil was sufficient for approximately 3-fold stimulation. The activity explains RabL2 inactivation and release shortly after IFT initiation. (boegholm2023theift81‐ift74complex pages 5-7, boegholm2023theift81‐ift74complex pages 7-9) Mainly recombinant Chlamydomonas evidence. IFT81–IFT74 acts as an unconventional GAP platform, but isolated human IFT81 has not been shown to have GAP activity. Boegholm et al., The EMBO Journal, 22 Aug 2023. doi:10.15252/embj.2022111807
Evolutionary conservation of RabL2 regulation The minimal Chlamydomonas IFT81(460–533)–IFT74(460–532) complex increased human RabL2B GTP hydrolysis approximately 5-fold. Human-complex cross-linking supported a conserved interface; disruption through IFT74 T438R reduced RabL2 recruitment and ciliary IFT particles in human RPE-hTERT cells. (boegholm2023theift81‐ift74complex pages 10-11) Cross-species biochemical evidence plus human-cell validation of the IFT74 interface. It supports conservation but is not a complete enzymatic assay of purified human IFT81–IFT74. Boegholm et al., The EMBO Journal, 22 Aug 2023. doi:10.15252/embj.2022111807
Partner-module genetics: IFT74 variants Human deletion of IFT74's first 40 residues caused skeletal ciliopathy with severely shortened motile cilia; biallelic splice variants caused lethal chondrodysplasia. Mouse null alleles blocked ciliogenesis and caused midgestational lethality. The deleted segment was dispensable for IFT-subunit binding but important for tubulin binding. (bakey2023ift74variantscause pages 1-2) These are IFT74—not IFT81—variants. They independently support the physiological importance of the shared IFT74–IFT81 tubulin-loading module and must not be counted as human IFT81 cases. Bakey et al., PLOS Genetics, 14 Jun 2023. doi:10.1371/journal.pgen.1010796
IFT81 is an exceptionally rare human ciliopathy locus Screening 1,628 affected individuals identified homozygous IFT81 c.1188+1G>A in a child with nephronophthisis and postaxial foot polydactyly, and homozygous c.2015_2019del (p.Asp672Alafs15) in another patient. The latter's fibroblasts showed 69.9% ciliation versus 83.9%* in controls (p = 0.000026), shorter cilia, and increased SAG-stimulated GLI2 expression. (perrault2015ift81encodingan pages 3-3, perrault2015ift81encodingan pages 3-4, perrault2015ift81encodingan pages 4-4) Direct human genetic and fibroblast evidence. The p.Asp672Alafs15 patient also had biallelic pathogenic PPT1* p.Gly245Arg and only 5% residual PPT1 activity, strongly confounding neurological and retinal attribution to IFT81. Perrault et al., Journal of Medical Genetics, online 14 Aug 2015. doi:10.1136/jmedgenet-2014-102838
Skeletal ciliopathy, IFT-B destabilization and Hedgehog dysregulation Patient-derived chondrocytes with biallelic IFT81 variants had nearly absent IFT81, reduced IFT74, IFT52 and IFT88, normal KIF3A abundance, and abnormally long, variable cilia despite no significant reduction in the proportion of ciliated cells. Mutant cells had an increased GLI3 full-length:repressor ratio; wild-type IFT81 partially normalized ciliary length and GLI3 processing. (duran2016destabilizationofthe pages 4-7, duran2016destabilizationofthe pages 3-4, duran2016destabilizationofthe pages 2-3) Direct human patient-cell evidence. Establishes a causal link between hypomorphic IFT81 dysfunction, destabilized anterograde IFT-B, abnormal ciliary architecture, and Hedgehog/GLI processing in cartilage. Duran et al., Scientific Reports, 27 Sep 2016. doi:10.1038/srep34232

Table: Evidence supporting the molecular and clinical annotation of verified human IFT81 (Q8WYA0), with quantitative findings and explicit boundaries between human data and orthologue-based inference.

Overall assessment. The strongest direct functional annotation is IFT74-associated tubulin-cargo binding coupled to IFT-B scaffolding at the primary cilium; human loss-of-function/rescue and patient-cell studies substantiate its importance for cilium assembly and signaling. Recent structural and RabL2 work substantially refines the mechanism, but aspects established only with Chlamydomonas complexes remain conservation-based inferences for human IFT81. (bhogaraju2013molecularbasisof pages 1-3, bhogaraju2013molecularbasisof pages 3-4, petriman2022biochemicallyvalidatedstructural pages 4-6, boegholm2023theift81‐ift74complex pages 7-9, duran2016destabilizationofthe pages 4-7)

References

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Artifacts

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