{
  "url": "https://dantelabs.com/traits/abnormal-hallux-morphology",
  "trait": {
    "bundleId": "2026.10.16-c6eea6bf",
    "release": "2026-09-01",
    "slug": "abnormal-hallux-morphology",
    "id": "HP:0001844",
    "name": "Abnormality of the big toe",
    "label": "Abnormal hallux morphology",
    "definition": "This term applies for all abnormalities of the big toe, also called hallux.",
    "synonyms": [
      "Abnormalities of the hallux",
      "Abnormality of the hallux"
    ],
    "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": "abnormal-toe-morphology",
        "name": "Abnormalities of the toes",
        "url": "https://dantelabs.com/traits/abnormal-toe-morphology"
      }
    ],
    "narrower": [
      {
        "slug": "broad-hallux",
        "name": "Broad big toe",
        "genes": 87,
        "url": "https://dantelabs.com/traits/broad-hallux"
      },
      {
        "slug": "long-hallux",
        "name": "Long big toe",
        "genes": 22,
        "url": "https://dantelabs.com/traits/long-hallux"
      },
      {
        "slug": "preaxial-foot-polydactyly",
        "name": "Preaxial foot polydactyly",
        "genes": 20,
        "url": "https://dantelabs.com/traits/preaxial-foot-polydactyly"
      },
      {
        "slug": "paresis-of-extensor-muscles-of-the-big-toe",
        "name": "Paresis of extensor muscles of the big toe",
        "genes": 6,
        "url": "https://dantelabs.com/traits/paresis-of-extensor-muscles-of-the-big-toe"
      },
      {
        "slug": "deviation-of-the-hallux",
        "name": "Displacement of big toe",
        "genes": 4,
        "url": "https://dantelabs.com/traits/deviation-of-the-hallux"
      },
      {
        "slug": "aplasia-hypoplasia-of-the-hallux",
        "name": "Absent/small big toe",
        "genes": 2,
        "url": "https://dantelabs.com/traits/aplasia-hypoplasia-of-the-hallux"
      },
      {
        "slug": "abnormal-hallux-phalanx-morphology",
        "name": "Abnormal big toe bones",
        "genes": 0,
        "url": "https://dantelabs.com/traits/abnormal-hallux-phalanx-morphology"
      }
    ],
    "genes": [
      {
        "slug": "acvr1",
        "symbol": "ACVR1",
        "hgnc": "HGNC:171",
        "name": "activin A receptor type 1",
        "frequency": "very-frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/acvr1"
      },
      {
        "slug": "ptrh2",
        "symbol": "PTRH2",
        "hgnc": "HGNC:24265",
        "name": "peptidyl-tRNA hydrolase 2",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ptrh2"
      }
    ]
  }
}