{
  "url": "https://dantelabs.com/traits/trismus",
  "trait": {
    "bundleId": "2026.10.17-8666dff2",
    "release": "2026-09-01",
    "slug": "trismus",
    "id": "HP:0000211",
    "name": "Decrease in jaw mobility",
    "label": "Trismus",
    "definition": "Limitation in the ability to open the mouth.",
    "synonyms": [
      "Decrease in jaw movement",
      "Decrease in jaw opening",
      "Limited jaw mobility",
      "Limited jaw movement",
      "Limited jaw opening",
      "Limited mouth opening",
      "Lockjaw",
      "Pain of muscles of mastication"
    ],
    "systems": [
      {
        "slug": "abnormality-of-head-or-neck",
        "name": "Abnormality of head or neck",
        "url": "https://dantelabs.com/traits/abnormality-of-head-or-neck"
      },
      {
        "slug": "abnormality-of-the-musculoskeletal-system",
        "name": "Abnormality of the musculoskeletal system",
        "url": "https://dantelabs.com/traits/abnormality-of-the-musculoskeletal-system"
      }
    ],
    "broader": [
      {
        "slug": "abnormal-mandible-morphology",
        "name": "Abnormality of the lower jaw bone",
        "url": "https://dantelabs.com/traits/abnormal-mandible-morphology"
      }
    ],
    "narrower": [],
    "genes": [
      {
        "slug": "ahdc1",
        "symbol": "AHDC1",
        "hgnc": "HGNC:25230",
        "name": "AT-hook DNA binding motif containing 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ahdc1"
      },
      {
        "slug": "kcnc2",
        "symbol": "KCNC2",
        "hgnc": "HGNC:6234",
        "name": "potassium voltage-gated channel subfamily C member 2",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/kcnc2"
      },
      {
        "slug": "myh8",
        "symbol": "MYH8",
        "hgnc": "HGNC:7578",
        "name": "myosin heavy chain 8",
        "frequency": "obligate",
        "diseases": 2,
        "url": "https://dantelabs.com/genes/myh8"
      },
      {
        "slug": "hspg2",
        "symbol": "HSPG2",
        "hgnc": "HGNC:5273",
        "name": "heparan sulfate proteoglycan 2",
        "frequency": "very-frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/hspg2"
      },
      {
        "slug": "gba1",
        "symbol": "GBA1",
        "hgnc": "HGNC:4177",
        "name": "glucosylceramidase beta 1",
        "frequency": "frequent",
        "diseases": 2,
        "url": "https://dantelabs.com/genes/gba1"
      },
      {
        "slug": "lifr",
        "symbol": "LIFR",
        "hgnc": "HGNC:6597",
        "name": "LIF receptor subunit alpha",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/lifr"
      },
      {
        "slug": "clpb",
        "symbol": "CLPB",
        "hgnc": "HGNC:30664",
        "name": "ClpB family mitochondrial disaggregase",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/clpb"
      },
      {
        "slug": "col2a1",
        "symbol": "COL2A1",
        "hgnc": "HGNC:2200",
        "name": "collagen type II alpha 1 chain",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/col2a1"
      },
      {
        "slug": "pnkd",
        "symbol": "PNKD",
        "hgnc": "HGNC:9153",
        "name": "PNKD metallo-beta-lactamase domain containing",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pnkd"
      },
      {
        "slug": "prrt2",
        "symbol": "PRRT2",
        "hgnc": "HGNC:30500",
        "name": "proline rich transmembrane protein 2",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/prrt2"
      },
      {
        "slug": "crlf1",
        "symbol": "CRLF1",
        "hgnc": "HGNC:2364",
        "name": "cytokine receptor like factor 1",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/crlf1"
      },
      {
        "slug": "ednra",
        "symbol": "EDNRA",
        "hgnc": "HGNC:3179",
        "name": "endothelin receptor type A",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ednra"
      },
      {
        "slug": "mymk",
        "symbol": "MYMK",
        "hgnc": "HGNC:33778",
        "name": "myomaker, myoblast fusion factor",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/mymk"
      },
      {
        "slug": "sf3b4",
        "symbol": "SF3B4",
        "hgnc": "HGNC:10771",
        "name": "splicing factor 3b subunit 4",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/sf3b4"
      },
      {
        "slug": "tpm2",
        "symbol": "TPM2",
        "hgnc": "HGNC:12011",
        "name": "tropomyosin 2",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/tpm2"
      }
    ]
  }
}