Affinage

DHH

Desert hedgehog protein · UniProt O43323

Length
396 aa
Mass
43.6 kDa
Annotated
2026-06-09
43 papers in source corpus 15 papers cited in narrative 15 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 6/6 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

DHH is a secreted Hedgehog ligand that acts as a paracrine driver of gonadal somatic cell differentiation. In the testis, DHH produced by Sertoli cells signals through the Patched receptor, localized on Leydig and peritubular cells, to direct formation of adult-type Leydig cells and normal peritubular cell and seminiferous tubule development (PMID:11090455); loss-of-function in Dhh-null mice and a loss-of-function missense mutation in rats both eliminate adult-type Leydig cells and cause testosterone deficiency, with markedly reduced fetal Leydig cell numbers (PMID:11090455, PMID:21062903). Downstream, DHH engages a receptor-to-transcription-factor cascade in which Ptch2 acts as the functional receptor on stem Leydig cells, Gli1 is the primary transcriptional effector that transactivates Sf1, and Sf1 drives differentiation [PMID:bio_10.1101_2025.06.13.659479]; DHH signaling through GLI1/GLI2 likewise upregulates the steroidogenic factor Ad4BP/SF-1 (NR5A1) and cholesterogenic gene expression via Srebf2 in fetal Leydig progenitors (PMID:40878802). The same Smoothened/Gli1 pathway organizes seminiferous tubule architecture, promoting Sertoli cell polarity, peritubular myoid cell organization, and basal membrane formation (PMID:35987158). Beyond the testis, DHH (with IHH) from granulosa cells controls ovarian theca cell specification and androgen production (PMID:29788357), and DHH acts as an adipogenic brake in skeletal muscle fibro/adipogenic progenitors, restraining their adipogenic differentiation (PMID:37355632). DHH function requires intein-mediated auto-processing of its precursor: pathogenic variants associated with 46,XY gonadal dysgenesis impair self-cleavage and alter subcellular localization of the protein (PMID:30298535, PMID:32504121). DHH transcription is driven by upstream regulators including GATA4/GATA6 (PMID:31949236) and PKNOX1 (PMID:37864517).

Mechanistic history

Synthesis pass · year-by-year structured walk · 9 steps
  1. 2000 High

    Established DHH as a Sertoli-cell-derived paracrine signal required for testicular somatic cell development, answering where the ligand acts and on which cells.

    Evidence Dhh-null mouse knockout with histology and Patched immunolocalization

    PMID:11090455

    Open questions at the time
    • Did not define the downstream transcriptional effectors
    • Did not resolve which Patched paralog mediates which cellular response
  2. 2010 High

    Confirmed the requirement for DHH signaling in Leydig cell development in an independent species, showing the phenotype is conserved and ligand-dependent.

    Evidence Loss-of-function missense Dhh mutation in rat with marker IHC and testosterone measurement

    PMID:21062903

    Open questions at the time
    • Did not establish the molecular consequence of the missense mutation on the protein
    • Fetal vs adult Leydig lineage relationship not dissected
  3. 2018 Medium

    Defined a molecular mechanism of dysfunction for disease variants by showing DHH requires intein-mediated auto-proteolysis for function.

    Evidence In vitro cleavage assays comparing mutant DHH to wild-type and Drosophila Hh

    PMID:30298535

    Open questions at the time
    • Single lab biochemistry
    • Did not link cleavage defect to downstream signaling output in cells
  4. 2018 High

    Extended DHH function to the ovary, showing redundancy with IHH in theca cell specification and androgen production.

    Evidence Conditional single and double Dhh/Ihh knockout mice with hormonal profiling and ovarian transcriptomics

    PMID:29788357

    Open questions at the time
    • Did not separate the unique contribution of DHH from IHH at the receptor level
    • Effector transcription factors in theca cells not mapped
  5. 2020 Medium

    Linked auto-processing failure of disease variants to mislocalization, connecting biochemical defect to subcellular fate in 46,XY gonadal dysgenesis.

    Evidence In vitro self-cleavage assays, subcellular localization, and molecular dynamics across multiple variants

    PMID:32504121

    Open questions at the time
    • Correlation between cleavage and localization was imperfect
    • Did not measure signaling activity of mislocalized variants
  6. 2020 Medium

    Identified upstream transcriptional regulators (GATA4/GATA6) and a lineage role for Dhh-expressing Schwann cell precursors, broadening control and output of DHH-expressing cells.

    Evidence rDhh promoter-reporter assays with GATA co-transfection; Dhh-Cre lineage tracing of melanocyte origins

    PMID:31949236 PMID:33089656

    Open questions at the time
    • GATA regulation shown in adrenocortical autograft context only
    • Lineage tracing reflects Dhh-expressing cells, not DHH signaling function
  7. 2022 Medium

    Demonstrated that the Smoothened/Gli1 arm of DHH signaling organizes seminiferous tubule architecture, extending the role from cell differentiation to tissue morphogenesis.

    Evidence In vitro tubule reconstruction with cyclopamine and SAG, Gli1 readout

    PMID:35987158

    Open questions at the time
    • Pharmacological perturbation only
    • Cell-type-specific ligand source within the assay not resolved
  8. 2023 High

    Established DHH as the Hedgehog ligand restraining adipogenesis in muscle FAPs, identifying a non-gonadal homeostatic function.

    Evidence Conditional mutagenesis, pharmacological Hh modulators, and fate-tracing in vivo and in vitro

    PMID:37355632

    Open questions at the time
    • Receptor and effector identity in FAPs not specified
    • Cellular source of DHH in muscle not pinpointed
  9. 2025 Medium

    Resolved the receptor-to-transcription-factor axis for Leydig cell differentiation, defining Ptch2 as the functional receptor and a Gli1→Sf1 cascade, and linking GLI to steroidogenic and cholesterogenic gene programs.

    Evidence CRISPR knockouts (dhh, ptch1, ptch2, gli1, sf1), transplantation rescue and luciferase assays (tilapia, preprint); transcriptomics, CUT&RUN-seq, metabolic and reporter assays in fetal Leydig progenitors

    PMID:40878802 PMID:bio_10.1101_2025.06.13.659479

    Open questions at the time
    • Ptch2-specific axis demonstrated in a fish model
    • Direct GLI binding at Sf1/NR5A1 regulatory regions in mammals not fully established

Open questions

Synthesis pass · forward-looking unresolved questions
  • How DHH ligand processing, secretion, and receptor selectivity (Ptch1 vs Ptch2, BOC co-receptor engagement) are coordinated to produce cell-type-specific outputs remains unresolved.
  • No direct binding data for DHH–BOC interaction
  • Determinants of Ptch1 vs Ptch2 selectivity across tissues unknown
  • Structural basis of auto-processing-dependent signaling competence not solved

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0048018 receptor ligand activity 3 GO:0140096 catalytic activity, acting on a protein 2
Localization
GO:0005576 extracellular region 1
Pathway
R-HSA-1266738 Developmental Biology 3 R-HSA-1474165 Reproduction 3 R-HSA-162582 Signal Transduction 3
Partners
BOCGPR37PTCH1PTCH2

Evidence

Reading pass · 15 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2000 DHH (expressed by Sertoli cells) is required for formation of adult-type Leydig cells and normal peritubular cell and seminiferous tubule development; its receptor Patched (Ptc) is localized to both Leydig cells and peritubular cells, placing DHH as a paracrine signaling molecule in testicular development. Genetic knockout (Dhh-null mice), histological and immunolocalization analysis Biology of reproduction High 11090455
2010 A missense mutation in Dhh in rats results in loss of DHH signaling, markedly reduced fetal Leydig cell numbers, absence of adult-type Leydig cells, and testosterone deficiency, confirming DHH is essential for Leydig cell development. Fine linkage mapping, sequence analysis, immunohistochemistry with Leydig cell-specific markers, testosterone measurement Reproduction (Cambridge, England) High 21062903
2018 In vitro cleavage assays showed that the DHH p.(Glu212Lys) mutation retains ~50% auto-processing activity (partial abolishment of DHh auto-cleavage), while p.(Asn337Lysfs*24) completely abolishes auto-proteolysis, demonstrating that DHH undergoes intein-mediated auto-processing required for its function. In vitro cleavage assay of mutant DHH proteins compared to wild-type and Drosophila Hh Human mutation Medium 30298535
2020 Several pathogenic DHH variants associated with 46,XY gonadal dysgenesis are unable to perform self-cleavage (auto-processing), and this correlates (imperfectly) with altered subcellular localization of the resulting DHH proteins. In vitro self-cleavage assays, subcellular localization experiments, structural modeling and molecular dynamics simulations Human genetics Medium 32504121
2017 Molecular dynamics simulations showed that the DHH p.Trp173Cys mutation increases conformational flexibility of DHH and potentially alters its interaction with BOC (brother of CDO), a positive regulator of Hedgehog signalling, implicating DHH–BOC interaction in normal DHH signaling. Whole-exome sequencing for variant identification; molecular dynamics simulations for structural/interaction analysis Clinical endocrinology Low 28708305
2018 DHH and IHH produced by granulosa cells act together to regulate theca cell specification and androgen production in the ovary; single Dhh knockout mice retain fertility but show decreased androgen production, while combined Dhh/Ihh double knockout results in complete loss of theca cells and infertility. Conditional single and double knockout mice, hormonal profiling, ovarian transcriptome analysis Endocrinology High 29788357
2023 DHH is the key Hedgehog ligand that acts as an adipogenic brake in skeletal muscle fibro/adipogenic progenitors (FAPs), preventing their adipogenic differentiation; sustained DHH/Hh activation forces FAPs toward a fibrogenic fate causing fibrosis. Conditional mutagenesis (in vivo), pharmacological Hh modulators (in vivo and in vitro), fate-tracing Nature communications High 37355632
2015 Loss of GPR37 in Sertoli cells leads to altered expression of DHH mitogenic cascade components (increased Dhh, Gli2, and Ptch1), and Ptch1 is co-localized with and co-immunoprecipitates with GPR37 in primary Sertoli cells, indicating GPR37 modulates DHH signaling in Sertoli cells. Gpr37-null mouse analysis, qRT-PCR for pathway components, co-immunoprecipitation of Ptch1 and GPR37 in primary Sertoli cells FASEB journal Medium 25609427
2020 In antler chondrocytes, DHH signals through Ptch1/Smo to activate Gli transcription factors, which in turn regulate Foxa1/2/3 expression; this DHH→Smo→Gli→Foxa axis induces chondrocyte proliferation and hypertrophic differentiation (Col X and Runx2 upregulation). Recombinant DHH treatment, siRNA knockdown of Ptch1/Smo/Gli/Foxa, pharmacological inhibition (cyclopamine, GANT58), cell cycle analysis Journal of cellular physiology Medium 31960430
2022 The DHH signaling pathway (via Smoothened and Gli1) regulates reconstruction of seminiferous tubule-like structure in vitro, promoting Sertoli cell polarity, peritubular myoid cell organization, laminin secretion/basal membrane formation, and proliferation of Leydig, peritubular myoid, germ, and Sertoli cells. In vitro tubule reconstruction assay with cyclopamine (Smo inhibitor) and SAG (Smo agonist), Gli1 expression measurement Reproductive biology Medium 35987158
2020 Dhh-expressing Schwann cell precursors (SCPs) contribute to skin and cochlear melanocytes (but not vestibular melanocytes), as demonstrated by lineage tracing using a Dhh-Cre driver with a fluorescent Rosa26 reporter in a pure FVB/N background. Lineage tracing (Dhh-Cre x Rosa26-YFP reporter mice), histological analysis Pigment cell & melanoma research Medium 33089656
2023 PKNOX1 acts as a transcription factor for DHH, binding the DHH promoter region and upregulating DHH expression to activate the Hedgehog signaling pathway in stomach adenocarcinoma cells. Dual-luciferase reporter assay, qPCR, western blotting, siRNA knockdown International journal of immunopathology and pharmacology Medium 37864517
2020 GATA4 and GATA6 positively regulate Dhh transcription in rat adrenocortical autografts; reporter assays using the upstream rDhh promoter region containing a GATA binding motif showed significant upregulation upon GATA4 and/or GATA6 co-transfection. Reporter gene assay with rDhh upstream promoter region, PCR and RNAscope expression analysis in autograft tissue Scientific reports Medium 31949236
2025 DHH regulates stem Leydig cell (SLC) differentiation (not survival) via a Ptch2/Gli1/Sf1 signaling axis: Ptch2 acts as the functional receptor for DHH in SLCs, Gli1 is the primary transcriptional effector that transactivates Sf1, and Sf1 is indispensable for SLC differentiation. CRISPR/Cas9 knockout of dhh, ptch1, ptch2, gli1, sf1; SLC transplantation rescue; luciferase transactivation assays; DHH agonist treatment; 11-ketotestosterone rescue (in Nile tilapia model) bioRxivpreprint Medium bio_10.1101_2025.06.13.659479
2025 DHH and PDGF rapidly activate energy metabolism in fetal Leydig cell progenitors without altering gene expression, while DHH signaling through GLI1/GLI2 upregulates Ad4BP/SF-1 (NR5A1) gene expression (shown by reporter assay) and activates cholesterogenic gene expression via Srebf2 upregulation. Transcriptome analysis, CUT&RUN-seq, metabolic activity assays, reporter gene assays Endocrinology Medium 40878802

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 281 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 50 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
2023 Hedgehog signaling via its ligand DHH acts as cell fate determinant during skeletal muscle regeneration. Nature communications 41 37355632
2011 Two DHH subfamily 1 proteins contribute to pneumococcal virulence and confer protection against pneumococcal disease. Infection and immunity 40 21768284
2014 Evolutionary genomics and adaptive evolution of the Hedgehog gene family (Shh, Ihh and Dhh) in vertebrates. PloS one 32 25549322
2014 Unique subunit packing in mycobacterial nanoRNase leads to alternate substrate recognitions in DHH phosphodiesterases. Nucleic acids research 27 24878921
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
2017 Structural and Biophysical Analysis of the Soluble DHH/DHHA1-Type Phosphodiesterase TM1595 from Thermotoga maritima. Structure (London, England : 1993) 23 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 23 25609427
2018 Role of DHH superfamily proteins in nucleic acids metabolism and stress tolerance in prokaryotes and eukaryotes. International journal of biological macromolecules 22 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
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 15 23851074
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
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
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 4 21366396
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
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

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