{
  "url": "https://dantelabs.com/traits/upper-limb-undergrowth",
  "trait": {
    "bundleId": "2026.10.17-8666dff2",
    "release": "2026-09-01",
    "slug": "upper-limb-undergrowth",
    "id": "HP:0009824",
    "name": "Upper limb undergrowth",
    "definition": "Arm shortening because of underdevelopment of one or more bones of the upper extremity.",
    "synonyms": [
      "Short arms",
      "Shortening of the arms",
      "Hypoplasia involving bones of the upper limbs"
    ],
    "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-bones-of-the-upper-limbs",
        "name": "Absent/small bones of the upper limbs",
        "url": "https://dantelabs.com/traits/aplasia-hypoplasia-involving-bones-of-the-upper-limbs"
      },
      {
        "slug": "limb-undergrowth",
        "name": "Limb undergrowth",
        "url": "https://dantelabs.com/traits/limb-undergrowth"
      }
    ],
    "narrower": [
      {
        "slug": "forearm-undergrowth",
        "name": "Forearm undergrowth",
        "genes": 5,
        "url": "https://dantelabs.com/traits/forearm-undergrowth"
      }
    ],
    "genes": [
      {
        "slug": "chuk",
        "symbol": "CHUK",
        "hgnc": "HGNC:1974",
        "name": "component of inhibitor of nuclear factor kappa B kinase complex",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/chuk"
      },
      {
        "slug": "tbx5",
        "symbol": "TBX5",
        "hgnc": "HGNC:11604",
        "name": "T-box transcription factor 5",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/tbx5"
      },
      {
        "slug": "bptf",
        "symbol": "BPTF",
        "hgnc": "HGNC:3581",
        "name": "bromodomain PHD finger transcription factor",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/bptf"
      },
      {
        "slug": "col2a1",
        "symbol": "COL2A1",
        "hgnc": "HGNC:2200",
        "name": "collagen type II alpha 1 chain",
        "frequency": "frequent",
        "diseases": 2,
        "url": "https://dantelabs.com/genes/col2a1"
      },
      {
        "slug": "fn1",
        "symbol": "FN1",
        "hgnc": "HGNC:3778",
        "name": "fibronectin 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/fn1"
      },
      {
        "slug": "pigt",
        "symbol": "PIGT",
        "hgnc": "HGNC:14938",
        "name": "phosphatidylinositol glycan anchor biosynthesis class T",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pigt"
      },
      {
        "slug": "psmd12",
        "symbol": "PSMD12",
        "hgnc": "HGNC:9557",
        "name": "proteasome 26S subunit, non-ATPase 12",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/psmd12"
      },
      {
        "slug": "sall4",
        "symbol": "SALL4",
        "hgnc": "HGNC:15924",
        "name": "spalt like transcription factor 4",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/sall4"
      },
      {
        "slug": "slc26a2",
        "symbol": "SLC26A2",
        "hgnc": "HGNC:10994",
        "name": "solute carrier family 26 member 2",
        "frequency": "frequent",
        "diseases": 2,
        "url": "https://dantelabs.com/genes/slc26a2"
      },
      {
        "slug": "dlk1",
        "symbol": "DLK1",
        "hgnc": "HGNC:2907",
        "name": "delta like non-canonical Notch ligand 1",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/dlk1"
      },
      {
        "slug": "lbr",
        "symbol": "LBR",
        "hgnc": "HGNC:6518",
        "name": "lamin B receptor",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/lbr"
      },
      {
        "slug": "meg3",
        "symbol": "MEG3",
        "hgnc": "HGNC:14575",
        "name": "maternally expressed 3",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/meg3"
      },
      {
        "slug": "pde4d",
        "symbol": "PDE4D",
        "hgnc": "HGNC:8783",
        "name": "phosphodiesterase 4D",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pde4d"
      },
      {
        "slug": "rtl1",
        "symbol": "RTL1",
        "hgnc": "HGNC:14665",
        "name": "retrotransposon Gag like 1",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/rtl1"
      },
      {
        "slug": "dpm1",
        "symbol": "DPM1",
        "hgnc": "HGNC:3005",
        "name": "dolichyl-phosphate mannosyltransferase subunit 1, catalytic",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/dpm1"
      },
      {
        "slug": "hyls1",
        "symbol": "HYLS1",
        "hgnc": "HGNC:26558",
        "name": "HYLS1 centriolar and ciliogenesis associated",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/hyls1"
      }
    ]
  }
}