{
  "url": "https://dantelabs.com/traits/hoffmann-sign",
  "trait": {
    "bundleId": "2026.10.16-c6eea6bf",
    "release": "2026-09-01",
    "slug": "hoffmann-sign",
    "id": "HP:0031993",
    "name": "Hoffmann sign",
    "definition": "A Hoffmann test is performed by flicking the fingernail of the long finger, from dorsal to volar, on each hand while the hand was supported by the examiner's hand. The test was done with the neck in the neutral position and then with the neck maximally forward flexed. Any flexion of the ipsilateral thumb and/or index finger was interpreted as a positive test.",
    "synonyms": [
      "Hoffmann's sign"
    ],
    "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-pyramidal-sign",
        "name": "Abnormal pyramidal sign",
        "url": "https://dantelabs.com/traits/abnormal-pyramidal-sign"
      }
    ],
    "narrower": [],
    "genes": [
      {
        "slug": "bcat2",
        "symbol": "BCAT2",
        "hgnc": "HGNC:977",
        "name": "branched chain amino acid transaminase 2",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/bcat2"
      },
      {
        "slug": "chp1",
        "symbol": "CHP1",
        "hgnc": "HGNC:17433",
        "name": "calcineurin like EF-hand protein 1",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/chp1"
      },
      {
        "slug": "coq4",
        "symbol": "COQ4",
        "hgnc": "HGNC:19693",
        "name": "coenzyme Q4",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/coq4"
      },
      {
        "slug": "aldh18a1",
        "symbol": "ALDH18A1",
        "hgnc": "HGNC:9722",
        "name": "aldehyde dehydrogenase 18 family member A1",
        "frequency": "very-frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/aldh18a1"
      },
      {
        "slug": "ang",
        "symbol": "ANG",
        "hgnc": "HGNC:483",
        "name": "angiogenin",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ang"
      },
      {
        "slug": "anxa11",
        "symbol": "ANXA11",
        "hgnc": "HGNC:535",
        "name": "annexin A11",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/anxa11"
      },
      {
        "slug": "atxn2",
        "symbol": "ATXN2",
        "hgnc": "HGNC:10555",
        "name": "ataxin 2",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/atxn2"
      },
      {
        "slug": "ccnf",
        "symbol": "CCNF",
        "hgnc": "HGNC:1591",
        "name": "cyclin F",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ccnf"
      },
      {
        "slug": "cfap410",
        "symbol": "CFAP410",
        "hgnc": "HGNC:1260",
        "name": "cilia and flagella associated protein 410",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/cfap410"
      },
      {
        "slug": "chchd10",
        "symbol": "CHCHD10",
        "hgnc": "HGNC:15559",
        "name": "coiled-coil-helix-coiled-coil-helix domain containing 10",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/chchd10"
      },
      {
        "slug": "chmp2b",
        "symbol": "CHMP2B",
        "hgnc": "HGNC:24537",
        "name": "charged multivesicular body protein 2B",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/chmp2b"
      },
      {
        "slug": "coq7",
        "symbol": "COQ7",
        "hgnc": "HGNC:2244",
        "name": "coenzyme Q7, hydroxylase",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/coq7"
      },
      {
        "slug": "dao",
        "symbol": "DAO",
        "hgnc": "HGNC:2671",
        "name": "D-amino acid oxidase",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/dao"
      },
      {
        "slug": "dctn1",
        "symbol": "DCTN1",
        "hgnc": "HGNC:2711",
        "name": "dynactin subunit 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/dctn1"
      },
      {
        "slug": "erbb4",
        "symbol": "ERBB4",
        "hgnc": "HGNC:3432",
        "name": "erb-b2 receptor tyrosine kinase 4",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/erbb4"
      },
      {
        "slug": "fig4",
        "symbol": "FIG4",
        "hgnc": "HGNC:16873",
        "name": "FIG4 phosphoinositide 5-phosphatase",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/fig4"
      },
      {
        "slug": "fus",
        "symbol": "FUS",
        "hgnc": "HGNC:4010",
        "name": "FUS RNA binding protein",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/fus"
      },
      {
        "slug": "galc",
        "symbol": "GALC",
        "hgnc": "HGNC:4115",
        "name": "galactosylceramidase",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/galc"
      },
      {
        "slug": "gle1",
        "symbol": "GLE1",
        "hgnc": "HGNC:4315",
        "name": "GLE1 RNA export mediator",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/gle1"
      },
      {
        "slug": "glt8d1",
        "symbol": "GLT8D1",
        "hgnc": "HGNC:24870",
        "name": "glycosyltransferase 8 domain containing 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/glt8d1"
      },
      {
        "slug": "hnrnpa1",
        "symbol": "HNRNPA1",
        "hgnc": "HGNC:5031",
        "name": "heterogeneous nuclear ribonucleoprotein A1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/hnrnpa1"
      },
      {
        "slug": "lrp12",
        "symbol": "LRP12",
        "hgnc": "HGNC:31708",
        "name": "LDL receptor related protein 12",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/lrp12"
      },
      {
        "slug": "matr3",
        "symbol": "MATR3",
        "hgnc": "HGNC:6912",
        "name": "matrin 3",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/matr3"
      },
      {
        "slug": "nefh",
        "symbol": "NEFH",
        "hgnc": "HGNC:7737",
        "name": "neurofilament heavy chain",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/nefh"
      },
      {
        "slug": "nek1",
        "symbol": "NEK1",
        "hgnc": "HGNC:7744",
        "name": "NIMA related kinase 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/nek1"
      },
      {
        "slug": "optn",
        "symbol": "OPTN",
        "hgnc": "HGNC:17142",
        "name": "optineurin",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/optn"
      },
      {
        "slug": "pfn1",
        "symbol": "PFN1",
        "hgnc": "HGNC:8881",
        "name": "profilin 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pfn1"
      },
      {
        "slug": "pi4ka",
        "symbol": "PI4KA",
        "hgnc": "HGNC:8983",
        "name": "phosphatidylinositol 4-kinase alpha",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/pi4ka"
      },
      {
        "slug": "prph",
        "symbol": "PRPH",
        "hgnc": "HGNC:9461",
        "name": "peripherin",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/prph"
      },
      {
        "slug": "sod1",
        "symbol": "SOD1",
        "hgnc": "HGNC:11179",
        "name": "superoxide dismutase 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/sod1"
      },
      {
        "slug": "spg7",
        "symbol": "SPG7",
        "hgnc": "HGNC:11237",
        "name": "SPG7 matrix AAA peptidase subunit, paraplegin",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/spg7"
      },
      {
        "slug": "sqstm1",
        "symbol": "SQSTM1",
        "hgnc": "HGNC:11280",
        "name": "sequestosome 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/sqstm1"
      },
      {
        "slug": "taf15",
        "symbol": "TAF15",
        "hgnc": "HGNC:11547",
        "name": "TATA-box binding protein associated factor 15",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/taf15"
      },
      {
        "slug": "tardbp",
        "symbol": "TARDBP",
        "hgnc": "HGNC:11571",
        "name": "TAR DNA binding protein",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/tardbp"
      },
      {
        "slug": "tbk1",
        "symbol": "TBK1",
        "hgnc": "HGNC:11584",
        "name": "TANK binding kinase 1",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/tbk1"
      },
      {
        "slug": "trem2",
        "symbol": "TREM2",
        "hgnc": "HGNC:17761",
        "name": "triggering receptor expressed on myeloid cells 2",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/trem2"
      },
      {
        "slug": "ubqln2",
        "symbol": "UBQLN2",
        "hgnc": "HGNC:12509",
        "name": "ubiquilin 2",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ubqln2"
      },
      {
        "slug": "unc13a",
        "symbol": "UNC13A",
        "hgnc": "HGNC:23150",
        "name": "unc-13 homolog A",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/unc13a"
      },
      {
        "slug": "vapb",
        "symbol": "VAPB",
        "hgnc": "HGNC:12649",
        "name": "VAMP associated protein B and C",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/vapb"
      },
      {
        "slug": "vcp",
        "symbol": "VCP",
        "hgnc": "HGNC:12666",
        "name": "valosin containing protein",
        "frequency": "frequent",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/vcp"
      },
      {
        "slug": "abcd1",
        "symbol": "ABCD1",
        "hgnc": "HGNC:61",
        "name": "ATP binding cassette subfamily D member 1",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/abcd1"
      },
      {
        "slug": "reep2",
        "symbol": "REEP2",
        "hgnc": "HGNC:17975",
        "name": "receptor accessory protein 2",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/reep2"
      },
      {
        "slug": "uchl1",
        "symbol": "UCHL1",
        "hgnc": "HGNC:12513",
        "name": "ubiquitin C-terminal hydrolase L1",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/uchl1"
      }
    ]
  }
}