Affinage

DHH

Desert hedgehog protein · UniProt O43323

Length
396 aa
Mass
43.6 kDa
Annotated
2026-04-28
43 papers in source corpus 15 papers cited in narrative 15 extracted findings

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

DHH is a Hedgehog family signaling ligand that functions as a paracrine morphogen essential for gonadal somatic cell differentiation, peripheral nerve perineurium formation, and mesenchymal cell fate decisions in multiple tissues. Produced primarily by Sertoli cells (and ovarian granulosa cells), DHH undergoes autocatalytic self-cleavage to generate an active N-terminal signaling domain that signals through the Patched receptor on neighboring cells, activating Smoothened and downstream Gli transcription factors to drive Leydig cell differentiation, theca cell specification, seminiferous tubule morphogenesis, and suppression of adipogenesis in fibro/adipogenic progenitors (PMID:11090455, PMID:29788357, PMID:37355632, PMID:30298535). Loss-of-function mutations in DHH cause 46,XY gonadal dysgenesis and minifascicular polyneuropathy in humans, with the severity depending on whether the mutation disrupts the signaling domain or only auto-processing (PMID:30298535, PMID:33107133). DHH transcription is regulated by GATA4/GATA6 and PKNOX1, and its downstream effectors Gli1/Gli2 activate NR5A1 (SF-1) and cholesterogenic gene programs to sustain steroidogenic cell identity and metabolic function (PMID:31949236, PMID:37864517, PMID:40878802).

Mechanistic history

Synthesis pass · year-by-year structured walk · 10 steps
  1. 2000 High

    Establishing that DHH is the Sertoli-cell-derived signal required for Leydig cell differentiation and seminiferous tubule integrity resolved the long-standing question of which paracrine factor couples Sertoli cell identity to the organization of the surrounding testicular interstitium.

    Evidence Dhh-null mouse with histological, immunolocalization, and morphological analysis showing absent adult Leydig cells, defective peritubular tissue, and impaired spermatogenesis

    PMID:11090455

    Open questions at the time
    • Downstream transcriptional effectors of DHH in Leydig cell progenitors not identified
    • Whether DHH signals through Ptch1 or Ptch2 in this context was unresolved
    • Role in female gonad not addressed
  2. 2010 High

    Cross-species replication using a rat missense mutant confirmed DHH as essential for both fetal and adult Leydig cell development and demonstrated that loss of DHH reduces embryonic testosterone, linking the ligand to steroidogenic output.

    Evidence Linkage mapping and sequencing of Dhh missense mutation in mp/mp rats, with Leydig cell immunohistochemistry and testosterone measurements

    PMID:21062903

    Open questions at the time
    • Precise signaling cascade downstream of DHH in fetal Leydig cells undefined
    • Whether DHH acts directly on Leydig progenitors versus through intermediate cell types was unclear
  3. 2015 Medium

    Identification of GPR37 as a Patched1-associated protein in Sertoli cells that modulates DHH/Gli2 expression introduced an upstream regulatory layer to the DHH signaling cascade in the testis.

    Evidence Co-immunoprecipitation of GPR37 with Ptc1 in primary Sertoli cells; Gpr37-null mouse with altered Dhh/Gli2/Ptch1 expression

    PMID:25609427

    Open questions at the time
    • Single co-IP without reciprocal validation
    • Functional consequence of GPR37-Ptch1 association on DHH signal transduction not directly tested
    • Whether GPR37 modulates DHH production or DHH reception is ambiguous
  4. 2018 High

    Biochemical dissection of DHH auto-processing revealed that autocatalytic self-cleavage generates the active N-terminal signaling domain and that distinct mutation classes produce graded clinical phenotypes—processing-null mutations cause gonadal dysgenesis alone, while signaling-domain mutations cause both gonadal dysgenesis and polyneuropathy.

    Evidence In vitro cleavage assays with wild-type and mutant DHH constructs; genotype–phenotype correlation in patients

    PMID:30298535

    Open questions at the time
    • How partially active DHH-N (from ~50% cleavage) is sufficient for peripheral nerve but not gonadal function is unexplained
    • Cholesterol modification of DHH-N not directly assayed
  5. 2018 High

    Conditional deletion of Dhh and Ihh in granulosa cells demonstrated that DHH co-operates with IHH to signal from granulosa cells to specify theca cells and enable ovarian androgen production, extending DHH's morphogen role beyond the testis.

    Evidence Granulosa-cell-specific Dhh, Ihh, and double conditional KO mice with hormonal profiles, histology, and transcriptomics

    PMID:29788357

    Open questions at the time
    • Relative individual contributions of DHH versus IHH to theca specification not fully separable
    • Receptor identity (Ptch1 vs Ptch2) on theca progenitors not determined
  6. 2020 Medium

    Multiple studies in 2020 consolidated the DHH–Ptch1–Smo–Gli1 signaling axis across distinct cell types: DHH drives peritubular myoid cell polarization and basal membrane formation in seminiferous tubule reconstruction, chondrocyte proliferation and hypertrophic differentiation via Gli-Foxa, and perineurial sheath formation in peripheral nerves.

    Evidence In vitro tubule reconstruction with SAG/cyclopamine (PMID:35987158); recombinant DHH treatment and siRNA knockdown in antler chondrocytes (PMID:31960430); nerve biopsy histopathology and DHH-null patient genetics (PMID:33107133)

    PMID:31960430 PMID:33107133 PMID:35987158

    Open questions at the time
    • Whether Gli1, Gli2, or Gli3 is the primary effector varies by tissue and was not systematically resolved
    • Direct ligand-receptor binding affinity for DHH-Ptch1 not measured in these systems
  7. 2020 Medium

    Reporter and localization assays with pathogenic DHH variants established that self-cleavage is required not only for generating active ligand but also for proper subcellular trafficking, and identified GATA4/GATA6 as transcriptional activators of DHH via a conserved GATA motif in the Dhh promoter.

    Evidence Self-cleavage assay and subcellular localization imaging of DHH variants (PMID:32504121); luciferase reporter assay with GATA binding motif from rDhh upstream region co-transfected with GATA4/6 (PMID:31949236)

    PMID:31949236 PMID:32504121

    Open questions at the time
    • Endogenous ChIP validation of GATA4/6 binding at Dhh promoter not performed
    • How mislocalized unprocessed DHH is degraded or causes dominant effects is unknown
  8. 2023 High

    Discovery that DHH is the key Hedgehog ligand suppressing adipogenic differentiation and promoting fibrogenesis in muscle fibro/adipogenic progenitors (FAPs) revealed a new tissue context for DHH signaling with implications for intramuscular fat accumulation.

    Evidence Tissue-specific conditional mutagenesis and pharmacological Hh agonists/antagonists in skeletal muscle, with cell fate assays

    PMID:37355632

    Open questions at the time
    • Source cell type producing DHH in skeletal muscle not definitively identified
    • Whether FAP response to DHH involves Ptch1 or Ptch2 is unresolved
  9. 2023 Medium

    Identification of PKNOX1 as a direct transcriptional activator of DHH added a second upstream regulator (beyond GATA4/6) and connected DHH expression to PKNOX1-driven signaling in adenocarcinoma cells.

    Evidence Dual-luciferase reporter assay with DHH promoter and PKNOX1 constructs, knockdown experiments

    PMID:37864517

    Open questions at the time
    • ChIP-seq confirmation of PKNOX1 occupancy at the DHH locus not performed
    • Physiological relevance of PKNOX1-DHH axis outside cancer cells not tested
  10. 2025 Medium

    Mechanistic dissection of DHH signaling in fetal Leydig cell progenitors showed that DHH rapidly activates energy metabolism independently of transcription, while Gli1/Gli2 subsequently upregulate NR5A1 (SF-1) and Srebf2-dependent cholesterogenic programs to sustain steroidogenic identity.

    Evidence Transcriptome analysis, CUT&RUN sequencing for Gli binding, metabolic activity assays, and reporter gene assays

    PMID:40878802

    Open questions at the time
    • Mechanism of rapid metabolic activation without transcriptional change is undefined
    • Whether the Gli1-NR5A1 axis operates identically in adult Leydig cells is untested

Open questions

Synthesis pass · forward-looking unresolved questions
  • Key unresolved questions include the structural basis for DHH-Ptch binding specificity (Ptch1 vs Ptch2 in different tissues), the identity of the DHH source cell in skeletal muscle, and the mechanism by which DHH activates acute metabolic changes independent of gene expression in Leydig progenitors.
  • No crystal structure of DHH-N bound to Ptch1 or Ptch2
  • Relative contributions of cholesterol modification versus palmitoylation to DHH range and potency are unexplored
  • Whether DHH has non-canonical (Smo-independent) signaling activities is untested

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0048018 receptor ligand activity 6 GO:0140096 catalytic activity, acting on a protein 2
Localization
GO:0005576 extracellular region 4
Pathway
R-HSA-162582 Signal Transduction 7 R-HSA-1266738 Developmental Biology 4
Partners
GATA4GATA6GLI1GPR37PTCH1PTCH2SMO

Evidence

Reading pass · 15 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2000 DHH is a signaling molecule expressed by Sertoli cells whose receptor Patched (Ptc) is localized to Leydig cells and peritubular cells; loss of Dhh in mice results in failure to form adult-type Leydig cells, abnormal peritubular tissue, absent/focal basal lamina, and severely restricted spermatogenesis, establishing DHH as required for Leydig cell differentiation and seminiferous tubule morphogenesis. Genetic knockout (Dhh-null mice) with histological, immunolocalization, and morphological phenotypic readouts Biology of reproduction High 11090455
2010 A missense mutation in the Dhh gene in mutant rats (mp/mp) results in loss of DHH signaling, dramatically reduced fetal Leydig cell number, absence of adult-type spindle-shaped Leydig cells, and significantly lower testosterone during embryonic development, confirming DHH is essential for Leydig cell development and androgen production. Fine linkage mapping, Sanger sequencing to identify missense mutation, immunohistochemistry with Leydig cell-specific marker, testosterone measurement Reproduction (Cambridge, England) High 21062903
2018 In vitro cleavage assays demonstrated that DHH undergoes autocatalytic self-cleavage (auto-processing) to generate the active N-terminal signaling domain (DHh-N); a frameshift mutation p.(Asn337Lysfs*24) completely abolished auto-proteolysis, while p.(Glu212Lys) retained ~50% cleavage activity. Complete disruption of DHh-N (signaling domain) was associated with both gonadal dysgenesis and polyneuropathy, while disruption of auto-processing alone was associated only with gonadal dysgenesis. In vitro cleavage/auto-processing assay with mutant and wild-type DHH constructs, compared with Drosophila Hh Human mutation High 30298535
2020 Multiple pathogenic DHH variants associated with 46,XY gonadal dysgenesis were tested in cell-based assays; a subset was unable to perform self-cleavage, which correlated with altered subcellular localization of the resulting proteins, establishing that self-cleavage is required for proper DHH processing and trafficking. In vitro self-cleavage assay, subcellular localization imaging, structural modelling and molecular dynamics simulations Human genetics Medium 32504121
2017 Molecular dynamics simulations showed that the DHH p.Trp173Cys mutation increases conformational flexibility of the protein and potentially alters its interaction with BOC (brother of CDO), a positive regulator of Hedgehog signalling, identifying BOC as an interaction partner of DHH and indicating that W173 is important for this interaction. Whole-exome sequencing to identify variant, molecular dynamics simulation of DHH-BOC interaction Clinical endocrinology Low 28708305
2015 GPR37, expressed in Sertoli cells, is associated with Patched 1 (DHH receptor) in primary Sertoli cell cultures, and Gpr37-null mice show altered expression of Dhh and downstream components (Gli2, Ptched1) in prepubertal testes, placing GPR37 as a modulator of the DHH mitogenic signaling cascade in Sertoli cells. Co-immunoprecipitation/association of GPR37 with Ptc1 in primary Sertoli cells, Gpr37-null mouse model with gene expression analysis FASEB journal Medium 25609427
2018 In mice lacking both Dhh and Ihh specifically in granulosa cells, theca cells failed to form and androgen production was abolished, establishing that DHH (together with IHH) signals from granulosa cells to regulate theca cell specification and steroidogenesis during folliculogenesis. Single and double conditional knockout mice (Dhh KO, Ihh KO, Dhh/Ihh DKO), reproductive fitness, hormonal profiles, ovarian transcriptomes Endocrinology High 29788357
2023 Using conditional mutagenesis and pharmacological Hh modulators, DHH was identified as the key Hedgehog ligand acting on fibro/adipogenic progenitors (FAPs) to prevent adipogenic differentiation and control fibrogenic fate in skeletal muscle; sustained DHH/Hh activation forces FAPs toward fibrogenesis, while loss of DHH promotes intramuscular fat formation. Conditional mutagenesis (tissue-specific KO), pharmacological Hh agonists/antagonists in vivo and in vitro, cell fate assays Nature communications High 37355632
2020 DHH signals through Ptch1/Smo/Gli1 in Sertoli and peritubular myoid cells to regulate seminiferous tubule reconstruction in vitro: Smoothened agonist (SAG) promoted peritubular myoid cell elongation and polarization of Sertoli cells, increased laminin secretion for basal membrane formation, and stimulated Gli1 expression, while cyclopamine (Smo inhibitor) suppressed Gli1 and disrupted tubule organization. In vitro tubule reconstruction assay with pharmacological Smo inhibitor (cyclopamine) and agonist (SAG), immunofluorescence, western blot Reproductive biology Medium 35987158
2020 In antler chondrocytes, DHH signals through Ptch1/Smo/Gli transcription factors to stimulate cell proliferation (G1-to-S phase transition) and hypertrophic differentiation (Col X, Runx2 upregulation); Gli transcription factors downstream of DHH-Smo signaling induce Foxa1/2/3 expression, which are required for chondrocyte differentiation. Recombinant DHH treatment, siRNA knockdown of Gli1-3 and Foxa, Smo inhibitor (cyclopamine), cell cycle analysis, chondrocyte differentiation markers Journal of cellular physiology Medium 31960430
2025 In fetal Leydig cell (FLC) progenitors, DHH and PDGF rapidly activate energy metabolism without altering gene expression, while GLI1/GLI2 (activated by DHH signaling) upregulate Ad4BP/SF-1 (NR5A1) gene expression to sustain metabolic activity in differentiated FLCs; DHH signaling also activates cholesterogenic gene expression through upregulation of Srebf2. Transcriptome analysis, CUT&RUN sequencing, metabolic activity assays, reporter gene assays with Gli1/Gli2 Endocrinology Medium 40878802
2020 DHH expressed by Sertoli cells signals to perineurial cells to regulate perineural sheath formation; DHH null mutations cause minifascicular neuropathy with structural disorganization of peripheral nerve fascicles, demonstrating a direct role for DHH in peripheral nerve perineurium development. DHH null mutation identification (genetics), nerve biopsy histopathology, high-resolution ultrasound of peripheral nerves, comparison with Dhh-/- mouse nerve phenotype Journal of the peripheral nervous system Medium 33107133
2023 PKNOX1 acts as a transcription factor for DHH, directly binding the DHH promoter region to upregulate DHH expression and activate Hedgehog signaling in stomach adenocarcinoma cells. Dual-luciferase reporter assay with DHH promoter and PKNOX1, knockdown experiments, western blot International journal of immunopathology and pharmacology Medium 37864517
2020 GATA4 and GATA6 regulate DHH transcription in adrenocortical autografts; reporter assays using the upstream region of rat Dhh containing a GATA binding motif showed that co-transfection with Gata4 or Gata6 significantly upregulated Dhh promoter activity. Promoter-reporter assay with GATA binding motif from rDhh upstream region, PCR and RNAscope for expression validation Scientific reports Medium 31949236
2025 In Nile tilapia stem Leydig cells (SLCs), DHH signals preferentially through Patched 2 (Ptch2, not Ptch1) as its functional receptor; downstream, Gli1 (not Gli2/3) is the primary transcriptional effector that transactivates Sf1 expression, which is indispensable for SLC differentiation into Leydig cells. CRISPR/Cas9 knockout of dhh, ptch1, ptch2, gli1, sf1; SLC transplantation rescue assays; luciferase assays in Gli-knockout SLCs; Dhh agonist treatment bioRxivpreprint Medium bio_10.1101_2025.06.13.659479

Source papers

Stage 0 corpus · 43 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2000 Desert hedgehog (Dhh) gene is required in the mouse testis for formation of adult-type Leydig cells and normal development of peritubular cells and seminiferous tubules. Biology of reproduction 280 11090455
2004 Mutations in the desert hedgehog (DHH) gene in patients with 46,XY complete pure gonadal dysgenesis. The Journal of clinical endocrinology and metabolism 109 15356051
2011 Structural and functional insights into the DNA replication factor Cdc45 reveal an evolutionary relationship to the DHH family of phosphoesterases. The Journal of biological chemistry 49 22147708
2015 46,XY Gonadal Dysgenesis due to a Homozygous Mutation in Desert Hedgehog (DHH) Identified by Exome Sequencing. The Journal of clinical endocrinology and metabolism 47 25927242
2010 A missense mutation of the Dhh gene is associated with male pseudohermaphroditic rats showing impaired Leydig cell development. Reproduction (Cambridge, England) 43 21062903
2011 Two DHH subfamily 1 proteins contribute to pneumococcal virulence and confer protection against pneumococcal disease. Infection and immunity 40 21768284
2023 Hedgehog signaling via its ligand DHH acts as cell fate determinant during skeletal muscle regeneration. Nature communications 37 37355632
2014 Evolutionary genomics and adaptive evolution of the Hedgehog gene family (Shh, Ihh and Dhh) in vertebrates. PloS one 32 25549322
2010 2',3'-cAMP hydrolysis by metal-dependent phosphodiesterases containing DHH, EAL, and HD domains is non-specific: Implications for PDE screening. Biochemical and biophysical research communications 27 20599695
2018 Reproductive, Physiological, and Molecular Outcomes in Female Mice Deficient in Dhh and Ihh. Endocrinology 23 29788357
2014 Unique subunit packing in mycobacterial nanoRNase leads to alternate substrate recognitions in DHH phosphodiesterases. Nucleic acids research 23 24878921
2017 Structural and Biophysical Analysis of the Soluble DHH/DHHA1-Type Phosphodiesterase TM1595 from Thermotoga maritima. Structure (London, England : 1993) 22 29107484
2015 Modulation of Dhh signaling and altered Sertoli cell function in mice lacking the GPR37-prosaposin receptor. FASEB journal : official publication of the Federation of American Societies for Experimental Biology 22 25609427
2018 Role of DHH superfamily proteins in nucleic acids metabolism and stress tolerance in prokaryotes and eukaryotes. International journal of biological macromolecules 21 30578903
2017 A novel variant of DHH in a familial case of 46,XY disorder of sex development: Insights from molecular dynamics simulations. Clinical endocrinology 19 28708305
2020 Dhh-expressing Schwann cell precursors contribute to skin and cochlear melanocytes, but not to vestibular melanocytes. Pigment cell & melanoma research 18 33089656
2013 DHH-RHEBL1 fusion transcript: a novel recurrent feature in the new landscape of pediatric CBFA2T3-GLIS2-positive acute myeloid leukemia. Oncotarget 18 24127550
2017 Partial duplication of DHH causes minifascicular neuropathy: A novel mutation detection of DHH. Annals of clinical and translational neurology 16 28589169
2021 Mutations in the desert hedgehog (DHH) gene in the disorders of sexual differentiation and male infertility. Journal of assisted reproduction and genetics 15 33712994
2006 The expression of Hedgehog genes (Ihh, Dhh) and Hedgehog target genes (Ptc1, Gli1, Coup-TfII) is affected by estrogenic stimuli in the uterus of immature female rats. Toxicology and applied pharmacology 15 17109907
2013 Crystal structure of the ligand-binding form of nanoRNase from Bacteroides fragilis, a member of the DHH/DHHA1 phosphoesterase family of proteins. FEBS letters 14 23851074
2018 A novel, homozygous mutation in desert hedgehog (DHH) in a 46, XY patient with dysgenetic testes presenting with primary amenorrhoea: a case report. International journal of pediatric endocrinology 13 29507583
2020 A Membrane-Associated DHH-DHHA1 Nuclease Degrades Type III CRISPR Second Messenger. Cell reports 11 32937129
2020 Novel insights into Dhh signaling in antler chondrocyte proliferation and differentiation: Involvement of Foxa. Journal of cellular physiology 9 31960430
2019 46,XY complete gonadal dysgenesis in a familial case with a rare mutation in the desert hedgehog (DHH) gene. Hormones (Athens, Greece) 9 31240586
2020 Cloning, expression and functional analysis of the desert hedgehog (dhh) gene in Chinese tongue sole (Cynoglossus semilaevis). Gene expression patterns : GEP 8 33359643
2018 In vitro functional characterization of the novel DHH mutations p.(Asn337Lysfs*24) and p.(Glu212Lys) associated with gonadal dysgenesis. Human mutation 8 30298535
2024 Structural and functional investigation of the DHH/DHHA1 family proteins in Deinococcus radiodurans. Nucleic acids research 5 38804263
2022 Dhh signaling pathway regulates reconstruction of seminiferous tubule-like structure. Reproductive biology 5 35987158
2020 DHH pathogenic variants involved in 46,XY disorders of sex development differentially impact protein self-cleavage and structural conformation. Human genetics 4 32504121
2019 Comparative and evolutionary analysis of the reptilian hedgehog gene family (Shh, Dhh, and Ihh). PeerJ 4 31531274
2020 Convergent pathological and ultrasound features in hereditary syndromic and non-syndromic minifascicular neuropathy related to DHH. Journal of the peripheral nervous system : JPNS 3 33107133
2018 Involvement of DHH and GLI1 in adrenocortical autograft regeneration in rats. Scientific reports 3 30266964
2011 Mutation analysis of the SRY, NR5A1, and DHH genes in six Chinese 46,XY women. The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians 3 21366396
2025 The DHH-DHHA1 domain phosphodiesterase of Mycoplasma bovis employs multiple strategies to modulate macrophage cellular processes. International journal of biological macromolecules 2 40023422
2023 PKNOX1 acts as a transcription factor of DHH and promotes the progression of stomach adenocarcinoma by regulating the Hedgehog signalling pathway. International journal of immunopathology and pharmacology 2 37864517
2022 Cloning, tissue distribution of desert hedgehog (dhh) gene and expression profiling during different developmental stages of Pseudopleuronectes yokohamae. Gene expression patterns : GEP 2 36152995
2021 [Clinical Findings in Two patients with DSD 46XY caused by new variant of the Desert Hedgehog Gene and review of the literature of the role of DHH signaling pathway in sex development]. Problemy endokrinologii 2 34297505
2021 Italian Version of the YQOL-DHH Questionnaire: Translation and Cross-cultural Adaptation. OTO open 2 34926977
2025 Regulation of Energy and Cholesterol Metabolisms During Fetal Leydig Cell Differentiation by DHH, PDGF, and Ad4BP/SF-1. Endocrinology 1 40878802
2022 Novel compound heterozygous mutations in the desert hedgehog (DHH) gene in cases of siblings with 46,XY disorders of sexual development. BMC medical genomics 1 35971145
2026 The role of DHH motifs in PRUNE1 gene on ion channels: A new insight into epilepsy pathogenesis. Epilepsy research 0 41980489
2020 GATA4/6 regulate DHH transcription in rat adrenocortical autografts. Scientific reports 0 31949236