Affinage

LHFPL5

LHFPL tetraspan subfamily member 5 protein · UniProt Q8TAF8

Length
219 aa
Mass
24.2 kDa
Annotated
2026-04-28
21 papers in source corpus 13 papers cited in narrative 13 extracted findings

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

LHFPL5 (also known as TMHS) is a tetraspan transmembrane auxiliary subunit of the hair cell mechano-electrical transduction (MET) channel complex that physically couples tip-link tension to channel gating in auditory and vestibular sensory cells. LHFPL5 forms a heterotetrameric assembly with PCDH15 (two LHFPL5 and two PCDH15 subunits) through extensive transmembrane and extracellular loop interactions, requiring PCDH15 for proper trafficking to stereocilia tips and plasma membrane insertion (PMID:30070639, PMID:29069081, PMID:36781873, PMID:41668373). Its N-terminal cytoplasmic domain binds a conserved amphipathic helix in TMC1, the pore-forming channel subunit, stabilizing TMC1 expression and directly transmitting mechanical force to the channel gate; disruption of this interface by point mutations or small N-terminal deletions causes deafness with severely impaired MET activation while leaving channel assembly and adaptation intact (PMID:36917610, PMID:33168709, PMID:41187086). Loss of LHFPL5 virtually abolishes gating-spring stiffness and reduces single-channel gating force by more than 60%, establishing LHFPL5 as a principal component of the gating spring that sets the force sensitivity and working range of mechanotransduction (PMID:38194445, PMID:15905332).

Mechanistic history

Synthesis pass · year-by-year structured walk · 10 steps
  1. 2005 High

    Identification of LHFPL5 as a hair-bundle protein whose loss causes deafness established the first genetic link between this tetraspan protein family and inner ear mechanosensory function.

    Evidence Positional cloning of the hscy mouse mutant, immunofluorescence localization to hair bundles, and scanning electron microscopy showing disorganized stereocilia

    PMID:15905332

    Open questions at the time
    • Molecular partners within the MET complex unknown
    • Whether LHFPL5 is required for mechanotransduction per se versus hair bundle development unclear
    • No biochemical interaction data
  2. 2007 High

    A targeted null allele phenocopied the original missense mutation, confirming that LHFPL5 loss alone is sufficient for deafness and revealing a developmental expression window peaking near birth.

    Evidence Tmhs knockout mice with lacZ reporter and auditory/vestibular phenotyping

    PMID:17876667

    Open questions at the time
    • Mechanism of action at the molecular level still unknown
    • Relationship to MET channel components not tested
  3. 2012 High

    Demonstration that LHFPL5 physically binds PCDH15, regulates transducer channel conductance, and is required for fast adaptation established it as an integral auxiliary subunit of the MET channel, analogous to TARPs for AMPA receptors.

    Evidence Reciprocal co-immunoprecipitation, mechanotransduction electrophysiology in Tmhs-/- mice, immunofluorescence

    PMID:23217710

    Open questions at the time
    • Structural basis of PCDH15–LHFPL5 interaction unknown
    • Whether LHFPL5 directly contacts the pore-forming subunit TMC1 not tested
    • Stoichiometry of the complex undetermined
  4. 2017 High

    Establishing that PCDH15 is required for LHFPL5 localization to stereocilia tips resolved the epistatic hierarchy of MET complex assembly, placing tip-link formation upstream of LHFPL5 recruitment.

    Evidence Immunogold electron microscopy and immunofluorescence in PCDH15-deficient and wild-type mice across developmental stages

    PMID:29069081

    Open questions at the time
    • Whether LHFPL5 mislocalization alone explains MET loss or additional functions are disrupted
    • Mechanism by which PCDH15 enables LHFPL5 trafficking unknown
  5. 2018 High

    Solving the crystal/cryo-EM structure of the PCDH15–LHFPL5 complex revealed a heterotetrameric architecture with deafness mutations mapping to the interface, providing the first atomic framework for understanding how the tip link couples to the channel.

    Evidence X-ray crystallography, cryo-EM, and analytical ultracentrifugation of reconstituted PCDH15–LHFPL5 complex

    PMID:30070639

    Open questions at the time
    • Structure of the full MET complex including TMC1 lacking
    • Conformational changes during gating not captured
    • Native stoichiometry not confirmed in vivo
  6. 2020 High

    Discovery that LHFPL5 directly binds and stabilizes TMC1 protein expression — and that the human deafness mutation TMC1-D572N disrupts this interaction — identified LHFPL5 as the physical link between the tip link and the channel pore.

    Evidence Single-molecule pulldown, co-immunoprecipitation, heterologous expression, and immunofluorescence in native hair cells; combined with zebrafish epistasis showing species-specific assembly differences

    PMID:32009898 PMID:33168709

    Open questions at the time
    • Binding interface between LHFPL5 and TMC1 not mapped at residue level
    • Whether LHFPL5 also contacts TMC2 with similar affinity unknown
  7. 2023 High

    Mapping the LHFPL5 N-terminal domain as the TMC1-binding element that couples to a conserved gating helix in TMC1, combined with the finding that PCDH15 is required to mask ER-retention signals in LHFPL5, defined the molecular logic of the tripartite PCDH15–LHFPL5–TMC1 force-transmission pathway.

    Evidence Site-directed mutagenesis of LHFPL5 N-terminus and TMC1 amphipathic helix with Co-IP and MET electrophysiology in knock-in mice; AGR trafficking assay with chimeric LHFPL5 constructs in heterologous cells

    PMID:36781873 PMID:36917610

    Open questions at the time
    • Structural model of the LHFPL5–TMC1 interface lacking
    • Trafficking mechanism in native hair cells not directly tested
  8. 2024 High

    Quantitative biophysical measurements in Lhfpl5-/- hair cells revealed that LHFPL5 contributes the majority of gating-spring stiffness and sets single-channel gating force, establishing it as the principal gating-spring element rather than merely an auxiliary subunit.

    Evidence Hair bundle stiffness measurements and MET channel electrophysiology in Lhfpl5-/- and Lhfpl5+/- outer hair cells; comparison with Tmc1-D569N mutant

    PMID:38194445

    Open questions at the time
    • Whether LHFPL5 contributes elasticity intrinsically or via organizing other elements unclear
    • No direct measurement of LHFPL5 mechanical compliance
  9. 2025 High

    A three-amino-acid N-terminal deletion knock-in cleanly separated LHFPL5's force-transmission role from its channel-assembly function, showing that the N-terminus is specifically required for maximal MET activation but dispensable for channel localization and adaptation.

    Evidence Knock-in mouse with minimal N-terminal LHFPL5 deletion, MET electrophysiology, immunofluorescence for MET complex components

    PMID:41187086

    Open questions at the time
    • Whether these three residues directly contact TMC1 amphipathic helix not resolved structurally
    • Contribution of individual residues not dissected
  10. 2026 High

    Single-molecule assays on native cochlear and utricular tissue confirmed the 2:2 PCDH15:LHFPL5 heterotetrameric stoichiometry in vivo, validating the structural model in a physiological context.

    Evidence SiMPull and SiMoA applied to native mouse cochlea and utricle protein

    PMID:41668373

    Open questions at the time
    • Full stoichiometry of the complete MET complex (including TMC1/2) in native tissue remains undetermined
    • Whether stoichiometry differs between vestibular and auditory hair cell types not explored

Open questions

Synthesis pass · forward-looking unresolved questions
  • A high-resolution structure of the complete PCDH15–LHFPL5–TMC1 ternary complex and direct measurements of LHFPL5's intrinsic mechanical compliance are needed to explain how this protein generates or transmits gating-spring stiffness at the molecular level.
  • No ternary complex structure available
  • Intrinsic elasticity of LHFPL5 not measured
  • Whether LHFPL5 interacts with TMC2 in the same manner is untested

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0005198 structural molecule activity 3 GO:0060090 molecular adaptor activity 3
Localization
GO:0005886 plasma membrane 4 GO:0005929 cilium 3
Pathway
R-HSA-9709957 Sensory Perception 4
Partners
CDH23PCDH15TMC1
Complex memberships
MET channel complex (PCDH15–LHFPL5–TMC1)PCDH15–LHFPL5 heterotetramer

Evidence

Reading pass · 13 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2005 TMHS (LHFPL5) is a tetraspan transmembrane protein localized to the apical membrane and hair bundles of inner ear hair cells; loss-of-function (missense C→F substitution) causes disorganized hair bundles, progressive hair cell loss, deafness, and vestibular dysfunction in mice, establishing its role in hair bundle morphogenesis/stereocilia development. Positional cloning, immunofluorescence with specific polyclonal antibodies, scanning electron microscopy of cochleae from Tmhs mutant (hscy) mice Proceedings of the National Academy of Sciences of the United States of America High 15905332
2007 Targeted null mutation of Tmhs (LHFPL5) phenocopies the hscy missense mutation, confirming that loss of LHFPL5 alone causes deafness and vestibular dysfunction; lacZ reporter shows expression peaks around P0 and is absent by P15, consistent with a role in stereocilia development. Targeted gene knockout (Tmhs tm1Kjn), lacZ reporter driven by Tmhs promoter, beta-galactosidase activity visualization, auditory/vestibular phenotyping Mammalian genome : official journal of the International Mammalian Genome Society High 17876667
2012 TMHS (LHFPL5) physically binds to the tip-link component PCDH15, regulates tip-link assembly, controls transducer channel conductance, and is required for fast channel adaptation; it functions as an integral component of the hair cell mechanotransduction machinery analogous to TARP subunits of AMPA receptors. Co-immunoprecipitation, electrophysiology (mechanotransduction recordings), genetic knockout mice (Tmhs-/-), immunofluorescence, deafness mutation analysis Cell High 23217710
2017 LHFPL5 localization to stereocilia tips requires PCDH15; in PCDH15-deficient mice, LHFPL5 fails to reach tips and instead distributes to unranked stereocilia and lower lateral links. LHFPL5 is present in the MET apparatus as early as P0 and shows higher expression in apical than basal bundles. Immunofluorescence and immunogold transmission electron microscopy in wild-type and PCDH15-deficient mice across developmental time points (P0–P21) PloS one High 29069081
2018 Crystal/cryo structure of the PCDH15–LHFPL5 complex reveals a heterotetramer (two PCDH15 and two LHFPL5 subunits) with a 2-fold symmetric 'collar' near the membrane; LHFPL5 forms extensive interactions with PCDH15 transmembrane helices, stabilizing the overall assembly and placing deafness mutations at critical interfaces. X-ray crystallography and cryo-EM structural determination, analytical ultracentrifugation (AUC), biochemical reconstitution of PCDH15–LHFPL5 complex eLife High 30070639
2019 TMC1 and LHFPL5 co-localize at the tips of shorter stereocilia rows in neonatal hair cells; in adult inner hair cells, LHFPL5 distributes uniformly across shorter stereocilia rows while TMC1 distributes to all rows, suggesting distinct regulation in mature cells. Immunofluorescence, super-resolution microscopy, fractionation/localization in neonatal and adult mouse cochlear hair cells FASEB journal : official publication of the Federation of American Societies for Experimental Biology Medium 30808210
2020 LHFPL5 physically interacts with TMC1 and stabilizes TMC1 protein expression in both heterologous cells and native hair cells (soma and hair bundle); the semidominant deafness mutation D572N in human TMC1 (D569N in mouse) severely disrupts LHFPL5 binding and destabilizes TMC1. Single-molecule pulldown (SiMPull) assay, co-immunoprecipitation, heterologous expression systems, immunofluorescence in hair cells Proceedings of the National Academy of Sciences of the United States of America High 33168709
2020 In zebrafish, Lhfpl5a/b localization at stereocilia tips requires tip-link cadherins Pcdh15a and Cdh23, as well as the Myo7aa motor protein; however, in contrast to mice, TMC1/TMC2b localization to stereocilia does not depend on Lhfpl5, revealing species-specific differences in MET complex assembly. Genetic mutant analysis (lhfpl5a/b knockout zebrafish), GFP-tagged transgene localization, hair cell electrophysiology (mechanotransduction recordings), FM dye uptake Frontiers in molecular neuroscience High 32009898
2023 An extracellular loop 1 region of LHFPL5 (which interacts with PCDH15) contains sequences that preclude trafficking to the plasma membrane in heterologous cells; PCDH15 co-expression is required to mask ER retention signals or enable proper folding and trafficking of LHFPL5 to the plasma membrane. Aquaporin 3-tGFP plasma membrane reporter (AGR) assay, domain deletion and chimeric LHFPL5 constructs in heterologous cell lines, immunofluorescence Scientific reports Medium 36781873
2023 LHFPL5 directly couples the PCDH15 tip link to the TMC1 MET channel via its N-terminal cytoplasmic domain, which binds an amphipathic helix in TMC1 that is a conserved gating domain; mutations in either the LHFPL5 N-terminus or the TMC1 amphipathic helix that disrupt this interaction reduce channel responses to mechanical force, supporting a tether model for MET channel gating. Co-immunoprecipitation, electrophysiology (MET channel recordings), site-directed mutagenesis of LHFPL5 N-terminal domain and TMC1 amphipathic helix, mouse knockout/knock-in models Cell reports High 36917610
2024 LHFPL5 is a principal component of the gating spring that transmits tip-link tension to the MET channel: in Lhfpl5-/- outer hair cells, the MET working range more than doubles and single-channel gating force (Z) decreases by >60%, while gating stiffness (inferred from stiffness change upon tip-link destruction) is virtually abolished. The Tmc1 D569N mutation reduces LHFPL5 immunolabeling in stereocilia and similarly doubles the MET working range. Electrophysiology (MET channel recordings in Lhfpl5-/- and Lhfpl5+/- mice), hair bundle stiffness measurements, immunofluorescence Proceedings of the National Academy of Sciences of the United States of America High 38194445
2025 An LHFPL5 mutant lacking just three N-terminal amino acids causes recessive deafness and severely impairs MET channel activation; resting open probability is increased but unitary conductance, adaptation, and tonotopic properties are normal, and MET channel proteins remain in stereocilia at normal levels. This establishes that the LHFPL5 N-terminus is specifically required for maximal mechanical activation of MET channels without affecting channel assembly or adaptation. Knock-in mouse expressing N-terminal LHFPL5 deletion mutant, electrophysiology (MET recordings), immunofluorescence for MET channel components in stereocilia Proceedings of the National Academy of Sciences of the United States of America High 41187086
2026 Single-molecule pulldown (SiMPull) and single-molecule array (SiMoA) assays applied to native mouse cochlea and utricle establish that the PCDH15–LHFPL5 complex is a heterotetrameric assembly (two PCDH15 and two LHFPL5 subunits), confirming the stoichiometry of the tip-link complex in native tissue. Single-molecule pulldown (SiMPull), single-molecule array (SiMoA) with native protein from mouse cochlea and utricle Biophysical journal High 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 206 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 65 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
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
2020 The lhfpl5 Ohnologs lhfpl5a and lhfpl5b Are Required for Mechanotransduction in Distinct Populations of Sensory Hair Cells in Zebrafish. Frontiers in molecular neuroscience 24 32009898
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
2023 The tetraspan LHFPL5 is critical to establish maximal force sensitivity of the mechanotransduction channel of cochlear hair cells. Cell reports 23 36917610
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 15 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