{
  "url": "https://dantelabs.com/traits/microcephalic-sperm-head",
  "trait": {
    "bundleId": "2026.10.17-8666dff2",
    "release": "2026-09-01",
    "slug": "microcephalic-sperm-head",
    "id": "HP:0032561",
    "name": "Small-head sperm",
    "label": "Microcephalic sperm head",
    "definition": "Decreased size of the head of sperm.",
    "synonyms": [],
    "systems": [
      {
        "slug": "abnormality-of-the-genitourinary-system",
        "name": "Abnormality of the genitourinary system",
        "url": "https://dantelabs.com/traits/abnormality-of-the-genitourinary-system"
      }
    ],
    "broader": [
      {
        "slug": "abnormal-sperm-head-morphology",
        "name": "Abnormal sperm head morphology",
        "url": "https://dantelabs.com/traits/abnormal-sperm-head-morphology"
      }
    ],
    "narrower": [],
    "genes": [
      {
        "slug": "cfap91",
        "symbol": "CFAP91",
        "hgnc": "HGNC:24010",
        "name": "cilia and flagella associated protein 91",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/cfap91"
      },
      {
        "slug": "iqcn",
        "symbol": "IQCN",
        "hgnc": "HGNC:29350",
        "name": "IQ motif containing N",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/iqcn"
      },
      {
        "slug": "usp26",
        "symbol": "USP26",
        "hgnc": "HGNC:13485",
        "name": "ubiquitin specific peptidase 26",
        "frequency": "obligate",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/usp26"
      },
      {
        "slug": "cfap69",
        "symbol": "CFAP69",
        "hgnc": "HGNC:26107",
        "name": "cilia and flagella associated protein 69",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/cfap69"
      },
      {
        "slug": "ttc29",
        "symbol": "TTC29",
        "hgnc": "HGNC:29936",
        "name": "tetratricopeptide repeat domain 29",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/ttc29"
      }
    ]
  }
}