{
  "url": "https://dantelabs.com/traits/hyperextensible-thumb",
  "trait": {
    "bundleId": "2026.10.17-8666dff2",
    "release": "2026-09-01",
    "slug": "hyperextensible-thumb",
    "id": "HP:0005722",
    "name": "Double jointed thumb",
    "label": "Hyperextensible thumb",
    "definition": "The ability of the thumb joints to move beyond their normal range of motion.",
    "synonyms": [],
    "systems": [
      {
        "slug": "abnormality-of-the-musculoskeletal-system",
        "name": "Abnormality of the musculoskeletal system",
        "url": "https://dantelabs.com/traits/abnormality-of-the-musculoskeletal-system"
      }
    ],
    "broader": [
      {
        "slug": "hyperextensible-hand-joints",
        "name": "Hyperextensible hand joints",
        "url": "https://dantelabs.com/traits/hyperextensible-hand-joints"
      }
    ],
    "narrower": [],
    "genes": [
      {
        "slug": "usp9x",
        "symbol": "USP9X",
        "hgnc": "HGNC:12632",
        "name": "ubiquitin specific peptidase 9 X-linked",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/usp9x"
      }
    ]
  }
}