{
  "url": "https://dantelabs.com/traits/persistent-head-lag",
  "trait": {
    "bundleId": "2026.10.17-8666dff2",
    "release": "2026-09-01",
    "slug": "persistent-head-lag",
    "id": "HP:0032988",
    "name": "Persistent head lag",
    "definition": "The Premie-Neuro and the Dubowitz Neurological Examination score head lag in the same manner. Scoring for both is as follows: 0 = head drops and stays back, 1 = tries to lift head but drops it back, 2 = able to lift head slightly, 3 = lifts head in line with body, and 4 = head in front of body. This term applies if head lag persists beyond an expected age at a level of 0 or 1. Persistent head lag beyond age 4 mo has been linked to poor outcomes.",
    "synonyms": [
      "Head lag",
      "Headlag"
    ],
    "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": "motor-delay",
        "name": "Motor delay",
        "url": "https://dantelabs.com/traits/motor-delay"
      }
    ],
    "narrower": [],
    "genes": [
      {
        "slug": "cdk5",
        "symbol": "CDK5",
        "hgnc": "HGNC:1774",
        "name": "cyclin dependent kinase 5",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/cdk5"
      },
      {
        "slug": "cox10",
        "symbol": "COX10",
        "hgnc": "HGNC:2260",
        "name": "cytochrome c oxidase assembly factor heme A:farnesyltransferase COX10",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/cox10"
      },
      {
        "slug": "dot1l",
        "symbol": "DOT1L",
        "hgnc": "HGNC:24948",
        "name": "DOT1 like histone lysine methyltransferase",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/dot1l"
      },
      {
        "slug": "en1",
        "symbol": "EN1",
        "hgnc": "HGNC:3342",
        "name": "engrailed homeobox 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/en1"
      },
      {
        "slug": "farsb",
        "symbol": "FARSB",
        "hgnc": "HGNC:17800",
        "name": "phenylalanyl-tRNA synthetase subunit beta",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/farsb"
      },
      {
        "slug": "ift140",
        "symbol": "IFT140",
        "hgnc": "HGNC:29077",
        "name": "intraflagellar transport 140",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ift140"
      },
      {
        "slug": "itpr1",
        "symbol": "ITPR1",
        "hgnc": "HGNC:6180",
        "name": "inositol 1,4,5-trisphosphate receptor type 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/itpr1"
      },
      {
        "slug": "mecp2",
        "symbol": "MECP2",
        "hgnc": "HGNC:6990",
        "name": "methyl-CpG binding protein 2",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/mecp2"
      },
      {
        "slug": "micos13",
        "symbol": "MICOS13",
        "hgnc": "HGNC:33702",
        "name": "mitochondrial contact site and cristae organizing system subunit 13",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/micos13"
      },
      {
        "slug": "mmab",
        "symbol": "MMAB",
        "hgnc": "HGNC:19331",
        "name": "metabolism of cobalamin associated B",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/mmab"
      },
      {
        "slug": "mocs3",
        "symbol": "MOCS3",
        "hgnc": "HGNC:15765",
        "name": "molybdenum cofactor synthesis 3",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/mocs3"
      },
      {
        "slug": "mpz",
        "symbol": "MPZ",
        "hgnc": "HGNC:7225",
        "name": "myelin protein zero",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/mpz"
      },
      {
        "slug": "nono",
        "symbol": "NONO",
        "hgnc": "HGNC:7871",
        "name": "non-POU domain containing octamer binding",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/nono"
      },
      {
        "slug": "rfc4",
        "symbol": "RFC4",
        "hgnc": "HGNC:9972",
        "name": "replication factor C subunit 4",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/rfc4"
      },
      {
        "slug": "rnh1",
        "symbol": "RNH1",
        "hgnc": "HGNC:10074",
        "name": "ribonuclease/angiogenin inhibitor 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/rnh1"
      },
      {
        "slug": "rnu2-2",
        "symbol": "RNU2-2",
        "hgnc": "HGNC:10152",
        "name": "RNA, U2 small nuclear 2",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/rnu2-2"
      },
      {
        "slug": "serpinh1",
        "symbol": "SERPINH1",
        "hgnc": "HGNC:1546",
        "name": "serpin family H member 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/serpinh1"
      },
      {
        "slug": "slc31a1",
        "symbol": "SLC31A1",
        "hgnc": "HGNC:11016",
        "name": "solute carrier family 31 member 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/slc31a1"
      },
      {
        "slug": "suclg1",
        "symbol": "SUCLG1",
        "hgnc": "HGNC:11449",
        "name": "succinate-CoA ligase GDP/ADP-forming subunit alpha",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/suclg1"
      },
      {
        "slug": "uba1",
        "symbol": "UBA1",
        "hgnc": "HGNC:12469",
        "name": "ubiquitin like modifier activating enzyme 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/uba1"
      },
      {
        "slug": "ugp2",
        "symbol": "UGP2",
        "hgnc": "HGNC:12527",
        "name": "UDP-glucose pyrophosphorylase 2",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ugp2"
      },
      {
        "slug": "dlat",
        "symbol": "DLAT",
        "hgnc": "HGNC:2896",
        "name": "dihydrolipoamide S-acetyltransferase",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/dlat"
      },
      {
        "slug": "gemin4",
        "symbol": "GEMIN4",
        "hgnc": "HGNC:15717",
        "name": "gem nuclear organelle associated protein 4",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/gemin4"
      },
      {
        "slug": "lins1",
        "symbol": "LINS1",
        "hgnc": "HGNC:30922",
        "name": "lines homolog 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/lins1"
      },
      {
        "slug": "lyrm4",
        "symbol": "LYRM4",
        "hgnc": "HGNC:21365",
        "name": "LYR motif containing 4",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/lyrm4"
      },
      {
        "slug": "myl1",
        "symbol": "MYL1",
        "hgnc": "HGNC:7582",
        "name": "myosin light chain 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/myl1"
      },
      {
        "slug": "slc25a12",
        "symbol": "SLC25A12",
        "hgnc": "HGNC:10982",
        "name": "solute carrier family 25 member 12",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/slc25a12"
      },
      {
        "slug": "camk2b",
        "symbol": "CAMK2B",
        "hgnc": "HGNC:1461",
        "name": "calcium/calmodulin dependent protein kinase II beta",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/camk2b"
      },
      {
        "slug": "creld1",
        "symbol": "CRELD1",
        "hgnc": "HGNC:14630",
        "name": "CRELD disulfide isomerase 1",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/creld1"
      },
      {
        "slug": "dhx30",
        "symbol": "DHX30",
        "hgnc": "HGNC:16716",
        "name": "DExH-box helicase 30",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/dhx30"
      },
      {
        "slug": "lamb2",
        "symbol": "LAMB2",
        "hgnc": "HGNC:6487",
        "name": "laminin subunit beta 2",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/lamb2"
      },
      {
        "slug": "naa20",
        "symbol": "NAA20",
        "hgnc": "HGNC:15908",
        "name": "N-alpha-acetyltransferase 20, NatB catalytic subunit",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/naa20"
      },
      {
        "slug": "nedd4l",
        "symbol": "NEDD4L",
        "hgnc": "HGNC:7728",
        "name": "NEDD4 like E3 ubiquitin protein ligase",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/nedd4l"
      },
      {
        "slug": "nsrp1",
        "symbol": "NSRP1",
        "hgnc": "HGNC:25305",
        "name": "nuclear speckle splicing regulatory protein 1",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/nsrp1"
      },
      {
        "slug": "timm50",
        "symbol": "TIMM50",
        "hgnc": "HGNC:23656",
        "name": "translocase of inner mitochondrial membrane 50",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/timm50"
      },
      {
        "slug": "uggt1",
        "symbol": "UGGT1",
        "hgnc": "HGNC:15663",
        "name": "UDP-glucose glycoprotein glucosyltransferase 1",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/uggt1"
      },
      {
        "slug": "sptbn1",
        "symbol": "SPTBN1",
        "hgnc": "HGNC:11275",
        "name": "spectrin beta, non-erythrocytic 1",
        "frequency": "very-rare",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/sptbn1"
      }
    ]
  }
}