{
  "url": "https://dantelabs.com/traits/narrow-jaw",
  "trait": {
    "bundleId": "2026.10.17-8666dff2",
    "release": "2026-09-01",
    "slug": "narrow-jaw",
    "id": "HP:0012801",
    "name": "Narrow jaw",
    "definition": "Bigonial distance (lower facial width) more than 2 standard deviations below the mean (objective); or an apparently decreased width of the lower jaw (mandible) when viewed from the front (subjective).",
    "synonyms": [
      "Narrow lower face",
      "Narrow lower jaw",
      "Thin lower face",
      "Thin lower jaw",
      "Narrow mandible"
    ],
    "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": "ccnk",
        "symbol": "CCNK",
        "hgnc": "HGNC:1596",
        "name": "cyclin K",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ccnk"
      },
      {
        "slug": "msl2",
        "symbol": "MSL2",
        "hgnc": "HGNC:25544",
        "name": "MSL complex subunit 2",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/msl2"
      },
      {
        "slug": "myod1",
        "symbol": "MYOD1",
        "hgnc": "HGNC:7611",
        "name": "myogenic differentiation 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/myod1"
      },
      {
        "slug": "nsd1",
        "symbol": "NSD1",
        "hgnc": "HGNC:14234",
        "name": "nuclear receptor binding SET domain protein 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/nsd1"
      }
    ]
  }
}