{
  "url": "https://dantelabs.com/traits/t-wave-alternans",
  "trait": {
    "bundleId": "2026.10.17-8666dff2",
    "release": "2026-09-01",
    "slug": "t-wave-alternans",
    "id": "HP:0012266",
    "name": "T-wave alternans",
    "definition": "A periodic beat-to-beat variation in the amplitude or shape of the T wave in an EKG.",
    "synonyms": [],
    "systems": [
      {
        "slug": "abnormality-of-the-cardiovascular-system",
        "name": "Abnormality of the cardiovascular system",
        "url": "https://dantelabs.com/traits/abnormality-of-the-cardiovascular-system"
      }
    ],
    "broader": [
      {
        "slug": "abnormal-t-wave",
        "name": "Abnormal T-wave",
        "url": "https://dantelabs.com/traits/abnormal-t-wave"
      }
    ],
    "narrower": [],
    "genes": [
      {
        "slug": "calm1",
        "symbol": "CALM1",
        "hgnc": "HGNC:1442",
        "name": "calmodulin 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/calm1"
      },
      {
        "slug": "calm3",
        "symbol": "CALM3",
        "hgnc": "HGNC:1449",
        "name": "calmodulin 3",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/calm3"
      },
      {
        "slug": "scn4b",
        "symbol": "SCN4B",
        "hgnc": "HGNC:10592",
        "name": "sodium voltage-gated channel beta subunit 4",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/scn4b"
      }
    ]
  }
}