{
  "url": "https://dantelabs.com/traits/prolonged-qt-interval",
  "trait": {
    "bundleId": "2026.10.17-8666dff2",
    "release": "2026-09-01",
    "slug": "prolonged-qt-interval",
    "id": "HP:0001657",
    "name": "Prolonged QT interval",
    "definition": "Increased time between the start of the Q wave and the end of the T wave as measured by the electrocardiogram (EKG).",
    "synonyms": [
      "Long QT syndrome",
      "Prolong qt interval on ekg"
    ],
    "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-qt-interval",
        "name": "Abnormal QT interval",
        "url": "https://dantelabs.com/traits/abnormal-qt-interval"
      }
    ],
    "narrower": [
      {
        "slug": "prolonged-qtc-interval",
        "name": "Prolonged QTc interval",
        "genes": 29,
        "url": "https://dantelabs.com/traits/prolonged-qtc-interval"
      }
    ],
    "genes": [
      {
        "slug": "alg10b",
        "symbol": "ALG10B",
        "hgnc": "HGNC:31088",
        "name": "ALG10 alpha-1,2-glucosyltransferase B",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/alg10b"
      },
      {
        "slug": "cacna1c",
        "symbol": "CACNA1C",
        "hgnc": "HGNC:1390",
        "name": "calcium voltage-gated channel subunit alpha1 C",
        "frequency": "obligate",
        "diseases": 2,
        "url": "https://dantelabs.com/genes/cacna1c"
      },
      {
        "slug": "cav3",
        "symbol": "CAV3",
        "hgnc": "HGNC:1529",
        "name": "caveolin 3",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/cav3"
      },
      {
        "slug": "kcne1",
        "symbol": "KCNE1",
        "hgnc": "HGNC:6240",
        "name": "potassium voltage-gated channel subfamily E regulatory subunit 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/kcne1"
      },
      {
        "slug": "kcnh2",
        "symbol": "KCNH2",
        "hgnc": "HGNC:6251",
        "name": "potassium voltage-gated channel subfamily H member 2",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/kcnh2"
      },
      {
        "slug": "tecrl",
        "symbol": "TECRL",
        "hgnc": "HGNC:27365",
        "name": "trans-2,3-enoyl-CoA reductase like",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/tecrl"
      },
      {
        "slug": "phox2b",
        "symbol": "PHOX2B",
        "hgnc": "HGNC:9143",
        "name": "paired like homeobox 2B",
        "frequency": "very-frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/phox2b"
      },
      {
        "slug": "clcnkb",
        "symbol": "CLCNKB",
        "hgnc": "HGNC:2027",
        "name": "chloride voltage-gated channel Kb",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/clcnkb"
      },
      {
        "slug": "dnajc19",
        "symbol": "DNAJC19",
        "hgnc": "HGNC:30528",
        "name": "DnaJ heat shock protein family (Hsp40) member C19",
        "frequency": "frequent",
        "diseases": 2,
        "url": "https://dantelabs.com/genes/dnajc19"
      },
      {
        "slug": "gpc3",
        "symbol": "GPC3",
        "hgnc": "HGNC:4451",
        "name": "glypican 3",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/gpc3"
      },
      {
        "slug": "gpc4",
        "symbol": "GPC4",
        "hgnc": "HGNC:4452",
        "name": "glypican 4",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/gpc4"
      },
      {
        "slug": "kcnd3",
        "symbol": "KCND3",
        "hgnc": "HGNC:6239",
        "name": "potassium voltage-gated channel subfamily D member 3",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/kcnd3"
      },
      {
        "slug": "kcnj2",
        "symbol": "KCNJ2",
        "hgnc": "HGNC:6263",
        "name": "potassium inwardly rectifying channel subfamily J member 2",
        "frequency": "frequent",
        "diseases": 2,
        "url": "https://dantelabs.com/genes/kcnj2"
      },
      {
        "slug": "kcnj5",
        "symbol": "KCNJ5",
        "hgnc": "HGNC:6266",
        "name": "potassium inwardly rectifying channel subfamily J member 5",
        "frequency": "frequent",
        "diseases": 2,
        "url": "https://dantelabs.com/genes/kcnj5"
      },
      {
        "slug": "slc12a3",
        "symbol": "SLC12A3",
        "hgnc": "HGNC:10912",
        "name": "solute carrier family 12 member 3",
        "frequency": "frequent",
        "diseases": 2,
        "url": "https://dantelabs.com/genes/slc12a3"
      },
      {
        "slug": "slc6a8",
        "symbol": "SLC6A8",
        "hgnc": "HGNC:11055",
        "name": "solute carrier family 6 member 8",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/slc6a8"
      },
      {
        "slug": "tango2",
        "symbol": "TANGO2",
        "hgnc": "HGNC:25439",
        "name": "transport and golgi organization 2 homolog",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/tango2"
      },
      {
        "slug": "ank2",
        "symbol": "ANK2",
        "hgnc": "HGNC:493",
        "name": "ankyrin 2",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ank2"
      },
      {
        "slug": "bptf",
        "symbol": "BPTF",
        "hgnc": "HGNC:3581",
        "name": "bromodomain PHD finger transcription factor",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/bptf"
      },
      {
        "slug": "cacna1s",
        "symbol": "CACNA1S",
        "hgnc": "HGNC:1397",
        "name": "calcium voltage-gated channel subunit alpha1 S",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/cacna1s"
      },
      {
        "slug": "dpagt1",
        "symbol": "DPAGT1",
        "hgnc": "HGNC:2995",
        "name": "dolichyl-phosphate N-acetylglucosaminephosphotransferase 1",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/dpagt1"
      },
      {
        "slug": "gabra3",
        "symbol": "GABRA3",
        "hgnc": "HGNC:4077",
        "name": "gamma-aminobutyric acid type A receptor subunit alpha3",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/gabra3"
      },
      {
        "slug": "gmppb",
        "symbol": "GMPPB",
        "hgnc": "HGNC:22932",
        "name": "GDP-mannose pyrophosphorylase B",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/gmppb"
      },
      {
        "slug": "gnas",
        "symbol": "GNAS",
        "hgnc": "HGNC:4392",
        "name": "GNAS complex locus",
        "frequency": "occasional",
        "diseases": 3,
        "url": "https://dantelabs.com/genes/gnas"
      },
      {
        "slug": "kcnj18",
        "symbol": "KCNJ18",
        "hgnc": "HGNC:39080",
        "name": "potassium inwardly rectifying channel subfamily J member 18",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/kcnj18"
      },
      {
        "slug": "lmna",
        "symbol": "LMNA",
        "hgnc": "HGNC:6636",
        "name": "lamin A/C",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/lmna"
      },
      {
        "slug": "psmd12",
        "symbol": "PSMD12",
        "hgnc": "HGNC:9557",
        "name": "proteasome 26S subunit, non-ATPase 12",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/psmd12"
      },
      {
        "slug": "ryr1",
        "symbol": "RYR1",
        "hgnc": "HGNC:10483",
        "name": "ryanodine receptor 1",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ryr1"
      },
      {
        "slug": "sry",
        "symbol": "SRY",
        "hgnc": "HGNC:11311",
        "name": "sex determining region Y",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/sry"
      },
      {
        "slug": "stx16",
        "symbol": "STX16",
        "hgnc": "HGNC:11431",
        "name": "syntaxin 16",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/stx16"
      },
      {
        "slug": "tnnt2",
        "symbol": "TNNT2",
        "hgnc": "HGNC:11949",
        "name": "troponin T2, cardiac type",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/tnnt2"
      },
      {
        "slug": "trpm4",
        "symbol": "TRPM4",
        "hgnc": "HGNC:17993",
        "name": "transient receptor potential cation channel subfamily M member 4",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/trpm4"
      },
      {
        "slug": "acadvl",
        "symbol": "ACADVL",
        "hgnc": "HGNC:92",
        "name": "acyl-CoA dehydrogenase very long chain",
        "frequency": "very-rare",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/acadvl"
      },
      {
        "slug": "hadh",
        "symbol": "HADH",
        "hgnc": "HGNC:4799",
        "name": "hydroxyacyl-CoA dehydrogenase",
        "frequency": "very-rare",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/hadh"
      },
      {
        "slug": "calm1",
        "symbol": "CALM1",
        "hgnc": "HGNC:1442",
        "name": "calmodulin 1",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/calm1"
      },
      {
        "slug": "cavin1",
        "symbol": "CAVIN1",
        "hgnc": "HGNC:9688",
        "name": "caveolae associated protein 1",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/cavin1"
      },
      {
        "slug": "kcne2",
        "symbol": "KCNE2",
        "hgnc": "HGNC:6242",
        "name": "potassium voltage-gated channel subfamily E regulatory subunit 2",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/kcne2"
      },
      {
        "slug": "kcnq1",
        "symbol": "KCNQ1",
        "hgnc": "HGNC:6294",
        "name": "potassium voltage-gated channel subfamily Q member 1",
        "diseases": 2,
        "url": "https://dantelabs.com/genes/kcnq1"
      },
      {
        "slug": "scn4b",
        "symbol": "SCN4B",
        "hgnc": "HGNC:10592",
        "name": "sodium voltage-gated channel beta subunit 4",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/scn4b"
      },
      {
        "slug": "scn5a",
        "symbol": "SCN5A",
        "hgnc": "HGNC:10593",
        "name": "sodium voltage-gated channel alpha subunit 5",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/scn5a"
      }
    ]
  }
}