Affinage

LHFPL5

LHFPL tetraspan subfamily member 5 protein · UniProt Q8TAF8

Length
219 aa
Mass
24.2 kDa
Annotated
2026-06-10
21 papers in source corpus 13 papers cited in narrative 13 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 5/5 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

LHFPL5 (TMHS) is a tetraspan integral membrane protein of cochlear and vestibular hair cell stereocilia that serves as the central auxiliary subunit coupling tip-link tension to the mechanoelectrical transduction (MET) channel (PMID:15905332, PMID:23217710). Loss of LHFPL5 function—whether by missense mutation or genetic null—causes disorganized hair bundles and deafness with vestibular dysfunction, establishing its requirement for hair bundle integrity and transduction (PMID:15905332, PMID:17876667). LHFPL5 physically binds the tip-link cadherin PCDH15, forming a heterotetrameric 2:2 complex in which LHFPL5 engages PCDH15 transmembrane helices to stabilize the assembly; this interaction governs tip-link assembly and is needed to deliver and retain LHFPL5 at stereocilia tips (PMID:23217710, PMID:29069081, PMID:30070639, PMID:41668373). On the channel side, LHFPL5 stabilizes the pore-forming subunit TMC1 and links the two via its N-terminal cytoplasmic domain, which binds a conserved amphipathic gating helix in TMC1; deafness mutations that disrupt either side of this interface impair force responses (PMID:33168709, PMID:36917610). Biophysically, LHFPL5 constitutes the principal component of the MET gating spring: its loss roughly doubles the working range, more than halves the single-channel gating force, and abolishes gating stiffness, while a precise three-residue N-terminal deletion impairs maximal mechanical activation without altering channel conductance, adaptation, or trafficking—demonstrating a dedicated mechanical-coupling role distinct from channel localization (PMID:38194445, PMID:41187086).

Mechanistic history

Synthesis pass · year-by-year structured walk · 13 steps
  1. 2005 Medium

    Establishing that an uncharacterized tetraspan membrane protein matters for hearing, positional cloning tied TMHS to hair bundle morphogenesis and deafness.

    Evidence Positional cloning, immunohistochemistry, and SEM of hurry-scurry mutant mouse cochleae

    PMID:15905332

    Open questions at the time
    • Molecular function beyond bundle morphology unknown
    • No interacting partners identified
    • Single missense allele studied
  2. 2007 Medium

    A targeted null allele confirmed that loss of TMHS function, not a neomorphic effect of the missense allele, causes the deafness/vestibular phenotype, and timed its expression to stereocilia development.

    Evidence Targeted gene knockout and lacZ reporter knock-in temporal expression assay in mice

    PMID:17876667

    Open questions at the time
    • Did not define molecular role within the bundle
    • Transient developmental expression seemingly conflicted with a permanent structural role
  3. 2012 High

    Resolving whether TMHS is structural or part of the transduction apparatus, it was shown to bind PCDH15, regulate tip-link assembly, and control channel conductance and fast adaptation.

    Evidence Co-immunoprecipitation, mechanotransduction electrophysiology, and knockout analysis in mice

    PMID:23217710

    Open questions at the time
    • Pore-forming channel partner not yet identified
    • Stoichiometry and structural basis of PCDH15 binding unknown
  4. 2017 High

    Addressing how LHFPL5 reaches its functional site, immunogold imaging localized it to ranked stereocilia tips and showed PCDH15 is required for that targeting.

    Evidence Immunofluorescence and immunogold TEM in wild-type and Pcdh15-knockout mice across development

    PMID:29069081

    Open questions at the time
    • Trafficking signal sequence not mapped
    • Mechanism of PCDH15-dependent retention unresolved
  5. 2018 High

    Defining the architecture of the LHFPL5–PCDH15 unit, the structure revealed a 2:2 heterotetramer with LHFPL5 clamping PCDH15 transmembrane helices and a membrane-proximal rigid collar.

    Evidence Cryo-EM/crystallography, analytical ultracentrifugation, and structure-based deafness mutation mapping

    PMID:30070639

    Open questions at the time
    • TMC channel not included in the structure
    • How the complex couples to the gate not shown
  6. 2019 Medium

    Reconciling transient developmental expression with a transduction role, LHFPL5 and TMC1 were shown to co-localize at shorter-row tips and persist into adulthood as permanent complex components.

    Evidence Immunofluorescence, confocal, and super-resolution microscopy in neonatal and adult mouse cochlea

    PMID:30808210

    Open questions at the time
    • Direct LHFPL5–TMC1 physical interaction not yet demonstrated here
    • Functional consequence of differential IHC TMC1 distribution unclear
  7. 2020 High

    Establishing a direct link to the pore subunit, LHFPL5 was shown to bind and stabilize TMC1, with a human deafness mutation disrupting this interaction.

    Evidence Single-molecule pull-down, co-IP in heterologous and native cells, and western blot stability assays with mutagenesis

    PMID:33168709

    Open questions at the time
    • Interacting domains not yet mapped
    • Whether stabilization vs. gating is the primary function unresolved
  8. 2020 Medium

    Testing cross-species requirements, zebrafish work confirmed PCDH15/CDH23/Myo7aa-dependent LHFPL5 tip localization but found TMC trafficking independent of Lhfpl5, exposing a species difference.

    Evidence GFP-Lhfpl5a transgene imaging in lhfpl5, pcdh15, cdh23, and myo7aa mutant zebrafish

    PMID:32009898

    Open questions at the time
    • Contradicts mouse evidence for LHFPL5-dependent TMC stabilization
    • Mechanism of the species difference unexplained
  9. 2023 High

    Identifying the molecular coupling element, the LHFPL5 N-terminal cytoplasmic domain was shown to bind a conserved TMC1 amphipathic gating helix, with interface mutations impairing force responses.

    Evidence Binding assays, mutagenesis of both partners, electrophysiology in mutant mice, conservation analysis

    PMID:36917610

    Open questions at the time
    • No structure of the N-terminus–helix interface
    • Quantitative contribution to gating not yet measured
  10. 2023 Medium

    Probing trafficking control, a region within LHFPL5 extracellular loop 1 was found to block plasma membrane delivery, consistent with PCDH15-masked ER retention.

    Evidence Plasma membrane GFP reporter (AGR) assay with LHFPL5 truncation/deletion constructs in heterologous cells

    PMID:36781873

    Open questions at the time
    • Direct ER-retention mechanism not confirmed
    • Reporter assay in heterologous cells, not native hair cells
    • Retention motif not precisely defined
  11. 2024 High

    Quantifying its mechanical role, biophysics established LHFPL5 as the principal gating-spring component transmitting tip-link tension to the channel.

    Evidence Patch-clamp, bundle stiffness measurements, and tip-link destruction in Lhfpl5 allelic-series outer hair cells

    PMID:38194445

    Open questions at the time
    • Molecular identity of residual gating stiffness in knockout unresolved
    • Direct mapping of elastic element within the complex not shown
  12. 2025 High

    Separating mechanical activation from trafficking, a three-residue N-terminal deletion impaired maximal MET activation while leaving conductance, adaptation, and complex localization intact.

    Evidence Knock-in mouse, patch-clamp of multiple channel parameters, immunofluorescence localization of MET proteins

    PMID:41187086

    Open questions at the time
    • Structural basis of the N-terminal effect on open probability not resolved
    • Whether the deleted residues directly contact TMC1 not directly shown
  13. 2026 Medium

    Confirming complex stoichiometry in vivo, native cochlear and utricular PCDH15–LHFPL5 complexes were counted as 2:2 heterotetramers by single-molecule methods.

    Evidence Single-molecule pull-down and single-molecule array stoichiometry counting of native mouse tissue protein

    PMID:41668373

    Open questions at the time
    • Stoichiometry of the full LHFPL5–PCDH15–TMC1 assembly not measured
    • Single lab determination

Open questions

Synthesis pass · forward-looking unresolved questions
  • How the elastic gating-spring element is physically embodied within the LHFPL5–PCDH15–TMC1 assembly and how N-terminal binding converts tip-link tension into pore opening remain to be resolved at structural and quantitative levels.
  • No structure of the complete MET complex including TMC1
  • Physical seat of elasticity within the complex unknown
  • Species differences in TMC dependence unexplained

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0060090 molecular adaptor activity 3 GO:0098772 molecular function regulator activity 3 GO:0140313 molecular sequestering activity 1
Localization
GO:0005856 cytoskeleton 3 GO:0005886 plasma membrane 2
Pathway
R-HSA-112316 Neuronal System 2 R-HSA-9709957 Sensory Perception 2
Partners
PCDH15TMC1
Complex memberships
PCDH15-LHFPL5 heterotetramerhair cell mechanoelectrical transduction (MET) channel complex

Evidence

Reading pass · 13 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2005 TMHS (LHFPL5) is a tetraspan integral membrane protein localized to the apical membrane (hair bundles) of inner and outer cochlear hair cells; loss-of-function missense mutation (C→F) causes disorganized hair bundles and deafness in hurry-scurry mice, implicating TMHS in hair bundle morphogenesis. Positional cloning, immunohistochemistry with polyclonal antibodies, scanning electron microscopy of cochleae in hscy mutant mice Proceedings of the National Academy of Sciences of the United States of America Medium 15905332
2007 Targeted null mutation of Tmhs (Lhfpl5) produces identical deafness/vestibular phenotype to the hscy missense allele, confirming that TMHS loss of function causes deafness; lacZ reporter shows expression peaks around P0 and is absent by P15, consistent with a role during stereocilia development. Targeted gene knockout (null allele), lacZ reporter knock-in, beta-galactosidase activity assay Mammalian genome Medium 17876667
2012 TMHS (LHFPL5) is an integral component of the hair cell mechanotransduction machinery: it binds to the tip-link component PCDH15, regulates tip-link assembly, controls transducer channel conductance, and is required for fast channel adaptation. Deafness-causing Tmhs mutations disrupt tip-link assembly and PCDH15 binding. Electrophysiology (mechanotransduction recordings), co-immunoprecipitation (TMHS–PCDH15 interaction), knockout mouse analysis, tip-link assembly assays Cell High 23217710
2017 LHFPL5 localizes to ranked stereocilia tips (site of tip links) from P0, peaks at P3, and becomes restricted to shorter stereocilia rows by P12. In PCDH15-deficient mice at P3, LHFPL5 is mislocalized away from tips to unranked stereocilia and lateral links, demonstrating that PCDH15 is required for LHFPL5 tip localization. Immunofluorescence and immunogold transmission electron microscopy in wild-type and Pcdh15-knockout mice across developmental time points PloS one High 29069081
2018 Crystal/cryo-EM structure of the PCDH15–LHFPL5 complex reveals a heterotetrameric assembly (2:2 stoichiometry with 2-fold symmetry) in which LHFPL5 forms extensive interactions with PCDH15 transmembrane helices and stabilizes the overall assembly; the extracellular cadherin domains form a mobile tether coupled to a rigid 'collar' near the membrane. Structural biology (cryo-EM/X-ray crystallography), analytical ultracentrifugation (sedimentation), structure-based mapping of deafness mutations eLife High 30070639
2019 TMC1 and LHFPL5 co-localize at the tips of shorter stereocilia rows in both neonatal and adult outer hair cells; LHFPL5 persists in the hair bundle after P7, confirming it is a permanent component of the mechanotransduction complex. In adult inner hair cells, TMC1 distributes uniformly across both tallest and shorter rows while LHFPL5 remains in shorter rows. Immunofluorescence, confocal microscopy, super-resolution microscopy in neonatal and adult mouse cochlea FASEB journal Medium 30808210
2020 LHFPL5 physically interacts with and stabilizes TMC1 protein in heterologous cells and in native hair cell soma and hair bundles; the deafness mutation D572N in human TMC1 (D569N in mouse) disrupts LHFPL5 binding and destabilizes TMC1 expression. Single-molecule pull-down (SiMPull microbead assay), co-immunoprecipitation in heterologous expression systems and native hair cells, western blot for protein stability Proceedings of the National Academy of Sciences of the United States of America High 33168709
2020 In zebrafish, LHFPL5 localization to stereocilia tips requires the tip-link cadherins Pcdh15a and Cdh23, as well as the motor protein Myo7aa; however, localization of TMC1 and TMC2b to stereocilia does not depend on Lhfpl5 (negative finding for Lhfpl5-dependent TMC trafficking in zebrafish). GFP-Lhfpl5a stable transgene imaging, lhfpl5a/b mutant zebrafish analysis, co-localization studies with Pcdh15, Cdh23, and Myo7aa knockouts Frontiers in molecular neuroscience Medium 32009898
2023 The N-terminal cytoplasmic domain of LHFPL5 directly binds to an amphipathic helix in TMC1 that is a critical gating domain conserved among MET channels; mutations in either the amphipathic helix of TMC1 or the N-terminus of LHFPL5 that disrupt this interaction impair mechanical force responses of the MET channel, supporting a tether model for tip-link gating. Binding assays, site-directed mutagenesis of LHFPL5 N-terminus and TMC1 amphipathic helix, electrophysiology in mutant mice, evolutionary conservation analysis Cell reports High 36917610
2023 A region within extracellular loop 1 of LHFPL5 (which interacts with PCDH15) prevents trafficking of LHFPL5 to the plasma membrane in heterologous cells, suggesting an endoplasmic reticulum retention signal that is masked by PCDH15 binding. Aquaporin 3-tGFP plasma membrane reporter (AGR) assay in heterologous cell lines with LHFPL5 truncation/deletion constructs Scientific reports Medium 36781873
2024 LHFPL5 is a principal component of the gating spring of the MET channel: Lhfpl5 knockout doubles the MET working range (52→123 nm), more than halves the single-channel gating force (0.34→0.13 pN), and virtually abolishes gating stiffness (~40% of total bundle stiffness in wild type vs. ~0 in knockout), establishing LHFPL5 as the primary mechanical link transmitting tip-link tension to the TMC channel. Patch-clamp electrophysiology in Lhfpl5-/- and Lhfpl5+/- outer hair cells; bundle stiffness measurements; tip-link destruction assays; comparison with Tmc1 D569N mutant mice Proceedings of the National Academy of Sciences of the United States of America High 38194445
2025 An LHFPL5 mutant lacking three N-terminal amino acids causes recessive deafness with drastically impaired MET; resting open probability of MET channels is increased, but unitary channel conductance, adaptation, and tonotopic properties remain normal. Crucially, MET channel proteins still localize normally to stereocilia, demonstrating that the N-terminus of LHFPL5 is specifically required for maximal mechanical activation of MET channels rather than for channel trafficking. Knock-in mouse model (3 N-terminal amino acid deletion), patch-clamp electrophysiology, immunofluorescence localization of MET complex proteins Proceedings of the National Academy of Sciences of the United States of America High 41187086
2026 Native PCDH15–LHFPL5 complexes isolated from mouse cochlea and utricle are heterotetrameric (2 PCDH15 : 2 LHFPL5) as determined by single-molecule stoichiometry; single-molecule pull-down and single-molecule array assays can detect and quantify amol-level native MET complex proteins. Single-molecule pull-down (SiMPull) and single-molecule array (SiMoA) with native protein from mouse cochlea/utricle; stoichiometry counting Biophysical journal Medium 41668373

Source papers

Stage 0 corpus · 21 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2012 TMHS is an integral component of the mechanotransduction machinery of cochlear hair cells. Cell 207 23217710
2005 A missense mutation in the previously undescribed gene Tmhs underlies deafness in hurry-scurry (hscy) mice. Proceedings of the National Academy of Sciences of the United States of America 83 15905332
2006 Mutations of human TMHS cause recessively inherited non-syndromic hearing loss. Journal of medical genetics 74 16459341
2018 Structure of mouse protocadherin 15 of the stereocilia tip link in complex with LHFPL5. eLife 66 30070639
2006 Mutations in the lipoma HMGIC fusion partner-like 5 (LHFPL5) gene cause autosomal recessive nonsyndromic hearing loss. Human mutation 54 16752389
2020 Deafness mutation D572N of TMC1 destabilizes TMC1 expression by disrupting LHFPL5 binding. Proceedings of the National Academy of Sciences of the United States of America 29 33168709
2023 The tetraspan LHFPL5 is critical to establish maximal force sensitivity of the mechanotransduction channel of cochlear hair cells. Cell reports 25 36917610
2020 The lhfpl5 Ohnologs lhfpl5a and lhfpl5b Are Required for Mechanotransduction in Distinct Populations of Sensory Hair Cells in Zebrafish. Frontiers in molecular neuroscience 25 32009898
2017 Spatiotemporal changes in the distribution of LHFPL5 in mice cochlear hair bundles during development and in the absence of PCDH15. PloS one 25 29069081
2019 Localization of TMC1 and LHFPL5 in auditory hair cells in neonatal and adult mice. FASEB journal : official publication of the Federation of American Societies for Experimental Biology 24 30808210
2007 Targeted knockout and lacZ reporter expression of the mouse Tmhs deafness gene and characterization of the hscy-2J mutation. Mammalian genome : official journal of the International Mammalian Genome Society 23 17876667
2024 LHFPL5 is a key element in force transmission from the tip link to the hair cell mechanotransducer channel. Proceedings of the National Academy of Sciences of the United States of America 16 38194445
2019 Novel Mutations in KCNQ4, LHFPL5 and COCH Genes in Iranian Families with Hearing Impairment. Archives of Iranian medicine 12 31126177
2011 DFNB66 and DFNB67 loci are non allelic and rarely contribute to autosomal recessive nonsyndromic hearing loss. European journal of medical genetics 8 21816241
2018 LHFPL5 mutation: A rare cause of non-syndromic autosomal recessive hearing loss. European journal of medical genetics 5 30476627
2023 Multiple plasma membrane reporters discern LHFPL5 region that blocks trafficking to the plasma membrane. Scientific reports 2 36781873
2018 Novel missense and 3'-UTR splice site variants in LHFPL5 cause autosomal recessive nonsyndromic hearing impairment. Journal of human genetics 2 30177809
2026 The protocadherin-15-LHFPL5 tip link complex is a heterotetrameric assembly in hair cell stereocilia. Biophysical journal 0 41668373
2025 [Genotype and phenotype characteristics of DFNB67 hearing loss patients with LHFPL5 variants]. Zhonghua yi xue za zhi 0 40340224
2025 LHFPL5 is required for maximal activation of the mechanotransduction channel in cochlear hair cells. Proceedings of the National Academy of Sciences of the United States of America 0 41187086
2025 LHFPL5 splice site variant in a cat with deafness and vestibular dysfunction. Animal genetics 0 41400044

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