{
  "url": "https://dantelabs.com/traits/increased-head-circumference",
  "trait": {
    "bundleId": "2026.10.16-c6eea6bf",
    "release": "2026-09-01",
    "slug": "increased-head-circumference",
    "id": "HP:0040194",
    "name": "Increased head circumference",
    "definition": "An abnormally increased head circumference in a growing child. Head circumference is measured with a nonelastic tape and comprises the distance from above the eyebrows and ears and around the back of the head. The measured HC is then plotted on an appropriate growth chart.",
    "synonyms": [],
    "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": "abnormality-of-skull-size",
        "name": "Abnormality of skull size",
        "url": "https://dantelabs.com/traits/abnormality-of-skull-size"
      }
    ],
    "narrower": [
      {
        "slug": "macrocephaly",
        "name": "Big calvaria",
        "genes": 426,
        "url": "https://dantelabs.com/traits/macrocephaly"
      }
    ],
    "genes": [
      {
        "slug": "cradd",
        "symbol": "CRADD",
        "hgnc": "HGNC:2340",
        "name": "CARD and death domain containing adaptor protein",
        "frequency": "very-frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/cradd"
      },
      {
        "slug": "apc2",
        "symbol": "APC2",
        "hgnc": "HGNC:24036",
        "name": "APC regulator of Wnt signaling pathway 2",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/apc2"
      },
      {
        "slug": "col2a1",
        "symbol": "COL2A1",
        "hgnc": "HGNC:2200",
        "name": "collagen type II alpha 1 chain",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/col2a1"
      },
      {
        "slug": "gcdh",
        "symbol": "GCDH",
        "hgnc": "HGNC:4189",
        "name": "glutaryl-CoA dehydrogenase",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/gcdh"
      },
      {
        "slug": "nsd1",
        "symbol": "NSD1",
        "hgnc": "HGNC:14234",
        "name": "nuclear receptor binding SET domain protein 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/nsd1"
      },
      {
        "slug": "adgrg1",
        "symbol": "ADGRG1",
        "hgnc": "HGNC:4512",
        "name": "adhesion G protein-coupled receptor G1",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/adgrg1"
      },
      {
        "slug": "galc",
        "symbol": "GALC",
        "hgnc": "HGNC:4115",
        "name": "galactosylceramidase",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/galc"
      },
      {
        "slug": "pgap2",
        "symbol": "PGAP2",
        "hgnc": "HGNC:17893",
        "name": "post-GPI attachment to proteins 2",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pgap2"
      },
      {
        "slug": "pgap3",
        "symbol": "PGAP3",
        "hgnc": "HGNC:23719",
        "name": "post-GPI attachment to proteins phospholipase 3",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pgap3"
      },
      {
        "slug": "pigl",
        "symbol": "PIGL",
        "hgnc": "HGNC:8966",
        "name": "phosphatidylinositol glycan anchor biosynthesis class L",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pigl"
      },
      {
        "slug": "pigo",
        "symbol": "PIGO",
        "hgnc": "HGNC:23215",
        "name": "phosphatidylinositol glycan anchor biosynthesis class O",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pigo"
      },
      {
        "slug": "pigv",
        "symbol": "PIGV",
        "hgnc": "HGNC:26031",
        "name": "phosphatidylinositol glycan anchor biosynthesis class V",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pigv"
      },
      {
        "slug": "pigw",
        "symbol": "PIGW",
        "hgnc": "HGNC:23213",
        "name": "phosphatidylinositol glycan anchor biosynthesis class W",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pigw"
      },
      {
        "slug": "pigy",
        "symbol": "PIGY",
        "hgnc": "HGNC:28213",
        "name": "phosphatidylinositol glycan anchor biosynthesis class Y",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pigy"
      },
      {
        "slug": "psap",
        "symbol": "PSAP",
        "hgnc": "HGNC:9498",
        "name": "prosaposin",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/psap"
      },
      {
        "slug": "tnfrsf11a",
        "symbol": "TNFRSF11A",
        "hgnc": "HGNC:11908",
        "name": "TNF receptor superfamily member 11a",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/tnfrsf11a"
      },
      {
        "slug": "nono",
        "symbol": "NONO",
        "hgnc": "HGNC:7871",
        "name": "non-POU domain containing octamer binding",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/nono"
      },
      {
        "slug": "piga",
        "symbol": "PIGA",
        "hgnc": "HGNC:8957",
        "name": "phosphatidylinositol glycan anchor biosynthesis class A",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/piga"
      }
    ]
  }
}