{
  "url": "https://dantelabs.com/traits/dilated-fourth-ventricle",
  "trait": {
    "bundleId": "2026.10.17-8666dff2",
    "release": "2026-09-01",
    "slug": "dilated-fourth-ventricle",
    "id": "HP:0002198",
    "name": "Dilated fourth ventricle",
    "definition": "An abnormal dilatation of the fourth cerebral ventricle.",
    "synonyms": [
      "Enlarged fourth ventricle"
    ],
    "systems": [
      {
        "slug": "abnormality-of-the-nervous-system",
        "name": "Abnormality of the nervous system",
        "url": "https://dantelabs.com/traits/abnormality-of-the-nervous-system"
      }
    ],
    "broader": [
      {
        "slug": "abnormal-fourth-ventricle-morphology",
        "name": "Abnormal fourth ventricle morphology",
        "url": "https://dantelabs.com/traits/abnormal-fourth-ventricle-morphology"
      },
      {
        "slug": "ventriculomegaly",
        "name": "Ventriculomegaly",
        "url": "https://dantelabs.com/traits/ventriculomegaly"
      }
    ],
    "narrower": [
      {
        "slug": "dandy-walker-malformation",
        "name": "Dandy-Walker malformation",
        "genes": 149,
        "url": "https://dantelabs.com/traits/dandy-walker-malformation"
      }
    ],
    "genes": [
      {
        "slug": "asns",
        "symbol": "ASNS",
        "hgnc": "HGNC:753",
        "name": "asparagine synthetase (glutamine-hydrolyzing)",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/asns"
      },
      {
        "slug": "b9d2",
        "symbol": "B9D2",
        "hgnc": "HGNC:28636",
        "name": "B9 domain containing 2",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/b9d2"
      },
      {
        "slug": "ints11",
        "symbol": "INTS11",
        "hgnc": "HGNC:26052",
        "name": "integrator complex subunit 11",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ints11"
      },
      {
        "slug": "mks1",
        "symbol": "MKS1",
        "hgnc": "HGNC:7121",
        "name": "MKS transition zone complex subunit 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/mks1"
      },
      {
        "slug": "pum1",
        "symbol": "PUM1",
        "hgnc": "HGNC:14957",
        "name": "pumilio RNA binding family member 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pum1"
      },
      {
        "slug": "rnu12",
        "symbol": "RNU12",
        "hgnc": "HGNC:19380",
        "name": "RNA, U12 small nuclear",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/rnu12"
      },
      {
        "slug": "lama1",
        "symbol": "LAMA1",
        "hgnc": "HGNC:6481",
        "name": "laminin subunit alpha 1",
        "frequency": "very-frequent",
        "diseases": 2,
        "url": "https://dantelabs.com/genes/lama1"
      },
      {
        "slug": "atxn3",
        "symbol": "ATXN3",
        "hgnc": "HGNC:7106",
        "name": "ataxin 3",
        "frequency": "frequent",
        "diseases": 4,
        "url": "https://dantelabs.com/genes/atxn3"
      },
      {
        "slug": "c2cd3",
        "symbol": "C2CD3",
        "hgnc": "HGNC:24564",
        "name": "C2 domain containing 3 centriole elongation regulator",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/c2cd3"
      },
      {
        "slug": "clxn",
        "symbol": "CLXN",
        "hgnc": "HGNC:25678",
        "name": "calaxin",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/clxn"
      },
      {
        "slug": "exoc2",
        "symbol": "EXOC2",
        "hgnc": "HGNC:24968",
        "name": "exocyst complex component 2",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/exoc2"
      },
      {
        "slug": "exoc3l2",
        "symbol": "EXOC3L2",
        "hgnc": "HGNC:30162",
        "name": "exocyst complex component 3 like 2",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/exoc3l2"
      },
      {
        "slug": "fkrp",
        "symbol": "FKRP",
        "hgnc": "HGNC:17997",
        "name": "fukutin related protein",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/fkrp"
      },
      {
        "slug": "gmppb",
        "symbol": "GMPPB",
        "hgnc": "HGNC:22932",
        "name": "GDP-mannose pyrophosphorylase B",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/gmppb"
      },
      {
        "slug": "grm1",
        "symbol": "GRM1",
        "hgnc": "HGNC:4593",
        "name": "glutamate metabotropic receptor 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/grm1"
      },
      {
        "slug": "mapkapk5",
        "symbol": "MAPKAPK5",
        "hgnc": "HGNC:6889",
        "name": "MAPK activated protein kinase 5",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/mapkapk5"
      },
      {
        "slug": "mef2c",
        "symbol": "MEF2C",
        "hgnc": "HGNC:6996",
        "name": "myocyte enhancer factor 2C",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/mef2c"
      },
      {
        "slug": "mre11",
        "symbol": "MRE11",
        "hgnc": "HGNC:7230",
        "name": "MRE11 double strand break repair nuclease",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/mre11"
      },
      {
        "slug": "pmm2",
        "symbol": "PMM2",
        "hgnc": "HGNC:9115",
        "name": "phosphomannomutase 2",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pmm2"
      },
      {
        "slug": "pomgnt1",
        "symbol": "POMGNT1",
        "hgnc": "HGNC:19139",
        "name": "protein O-linked mannose N-acetylglucosaminyltransferase 1 (beta 1,2-)",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pomgnt1"
      },
      {
        "slug": "pomk",
        "symbol": "POMK",
        "hgnc": "HGNC:26267",
        "name": "protein O-mannose kinase",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pomk"
      },
      {
        "slug": "pomt1",
        "symbol": "POMT1",
        "hgnc": "HGNC:9202",
        "name": "protein O-mannosyltransferase 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pomt1"
      },
      {
        "slug": "pomt2",
        "symbol": "POMT2",
        "hgnc": "HGNC:19743",
        "name": "protein O-mannosyltransferase 2",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pomt2"
      },
      {
        "slug": "rbmx",
        "symbol": "RBMX",
        "hgnc": "HGNC:9910",
        "name": "RNA binding motif protein X-linked",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/rbmx"
      },
      {
        "slug": "tuba1a",
        "symbol": "TUBA1A",
        "hgnc": "HGNC:20766",
        "name": "tubulin alpha 1a",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/tuba1a"
      },
      {
        "slug": "tubb",
        "symbol": "TUBB",
        "hgnc": "HGNC:20778",
        "name": "tubulin beta class I",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/tubb"
      },
      {
        "slug": "wls",
        "symbol": "WLS",
        "hgnc": "HGNC:30238",
        "name": "Wnt ligand secretion mediator",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/wls"
      },
      {
        "slug": "zic1",
        "symbol": "ZIC1",
        "hgnc": "HGNC:12872",
        "name": "Zic family zinc finger 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/zic1"
      },
      {
        "slug": "zic4",
        "symbol": "ZIC4",
        "hgnc": "HGNC:20393",
        "name": "Zic family zinc finger 4",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/zic4"
      },
      {
        "slug": "pmpca",
        "symbol": "PMPCA",
        "hgnc": "HGNC:18667",
        "name": "peptidase, mitochondrial processing subunit alpha",
        "frequency": "occasional",
        "diseases": 2,
        "url": "https://dantelabs.com/genes/pmpca"
      },
      {
        "slug": "rac1",
        "symbol": "RAC1",
        "hgnc": "HGNC:9801",
        "name": "Rac family small GTPase 1",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/rac1"
      },
      {
        "slug": "tmem67",
        "symbol": "TMEM67",
        "hgnc": "HGNC:28396",
        "name": "transmembrane protein 67",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/tmem67"
      },
      {
        "slug": "usp9x",
        "symbol": "USP9X",
        "hgnc": "HGNC:12632",
        "name": "ubiquitin specific peptidase 9 X-linked",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/usp9x"
      },
      {
        "slug": "wars2",
        "symbol": "WARS2",
        "hgnc": "HGNC:12730",
        "name": "tryptophanyl tRNA synthetase 2, mitochondrial",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/wars2"
      },
      {
        "slug": "nipa1",
        "symbol": "NIPA1",
        "hgnc": "HGNC:17043",
        "name": "NIPA magnesium transporter 1",
        "frequency": "very-rare",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/nipa1"
      },
      {
        "slug": "nipa2",
        "symbol": "NIPA2",
        "hgnc": "HGNC:17044",
        "name": "NIPA magnesium transporter 2",
        "frequency": "very-rare",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/nipa2"
      },
      {
        "slug": "tubg1",
        "symbol": "TUBG1",
        "hgnc": "HGNC:12417",
        "name": "tubulin gamma 1",
        "frequency": "very-rare",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/tubg1"
      },
      {
        "slug": "atxn1",
        "symbol": "ATXN1",
        "hgnc": "HGNC:10548",
        "name": "ataxin 1",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/atxn1"
      },
      {
        "slug": "atxn2",
        "symbol": "ATXN2",
        "hgnc": "HGNC:10555",
        "name": "ataxin 2",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/atxn2"
      },
      {
        "slug": "cask",
        "symbol": "CASK",
        "hgnc": "HGNC:1497",
        "name": "calcium/calmodulin dependent serine protein kinase",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/cask"
      },
      {
        "slug": "cox20",
        "symbol": "COX20",
        "hgnc": "HGNC:26970",
        "name": "cytochrome c oxidase assembly factor COX20",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/cox20"
      }
    ]
  }
}