{
  "url": "https://dantelabs.com/traits/forearm-undergrowth",
  "trait": {
    "bundleId": "2026.10.17-8666dff2",
    "release": "2026-09-01",
    "slug": "forearm-undergrowth",
    "id": "HP:0009821",
    "name": "Forearm undergrowth",
    "definition": "Forearm shortening because of underdevelopment of one or more bones of the forearm.",
    "synonyms": [
      "Short forearm bones",
      "Short forearms",
      "Shortened forearm",
      "Hypoplasia involving forearm bones"
    ],
    "systems": [
      {
        "slug": "abnormality-of-limbs",
        "name": "Abnormality of limbs",
        "url": "https://dantelabs.com/traits/abnormality-of-limbs"
      },
      {
        "slug": "abnormality-of-the-musculoskeletal-system",
        "name": "Abnormality of the musculoskeletal system",
        "url": "https://dantelabs.com/traits/abnormality-of-the-musculoskeletal-system"
      }
    ],
    "broader": [
      {
        "slug": "aplasia-hypoplasia-involving-forearm-bones",
        "name": "Absent/small forearm bones",
        "url": "https://dantelabs.com/traits/aplasia-hypoplasia-involving-forearm-bones"
      },
      {
        "slug": "short-long-bone",
        "name": "Short long bone",
        "url": "https://dantelabs.com/traits/short-long-bone"
      },
      {
        "slug": "upper-limb-undergrowth",
        "name": "Upper limb undergrowth",
        "url": "https://dantelabs.com/traits/upper-limb-undergrowth"
      }
    ],
    "narrower": [
      {
        "slug": "hypoplasia-of-the-ulna",
        "name": "Underdeveloped inner large forearm bone",
        "genes": 55,
        "url": "https://dantelabs.com/traits/hypoplasia-of-the-ulna"
      },
      {
        "slug": "hypoplasia-of-the-radius",
        "name": "Underdeveloped outer large forearm bone",
        "genes": 42,
        "url": "https://dantelabs.com/traits/hypoplasia-of-the-radius"
      },
      {
        "slug": "short-forearm",
        "name": "Short forearm",
        "genes": 2,
        "url": "https://dantelabs.com/traits/short-forearm"
      }
    ],
    "genes": [
      {
        "slug": "shox",
        "symbol": "SHOX",
        "hgnc": "HGNC:10853",
        "name": "SHOX homeobox",
        "frequency": "very-frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/shox"
      },
      {
        "slug": "ext1",
        "symbol": "EXT1",
        "hgnc": "HGNC:3512",
        "name": "exostosin glycosyltransferase 1",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ext1"
      },
      {
        "slug": "ext2",
        "symbol": "EXT2",
        "hgnc": "HGNC:3513",
        "name": "exostosin glycosyltransferase 2",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ext2"
      },
      {
        "slug": "recql4",
        "symbol": "RECQL4",
        "hgnc": "HGNC:9949",
        "name": "RecQ like helicase 4",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/recql4"
      },
      {
        "slug": "donson",
        "symbol": "DONSON",
        "hgnc": "HGNC:2993",
        "name": "DNA replication fork stabilization factor DONSON",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/donson"
      }
    ]
  }
}