Trait
Small-head sperm
Clinical name: Microcephalic sperm head
Decreased size of the head of sperm.
Summary
- Body system
- Abnormality of the genitourinary system
Reference genomeGRCh38hg38
Positions on gene and variant pages follow this choice, in this browser.
Read the genes linked to Small-head sperm, and the rest of your genome, with one test.
From $449Free shipping · Results in 6–8 weeks
Get my Genome Test5 genes linked to Small-head sperm
Changes in these genes cause rare conditions in which Small-head sperm is seen. Most people with this trait have none of those conditions, and a gene on this list says nothing about anyone's own genome.
| Gene | How often it is seen | Conditions |
|---|---|---|
| CFAP91cilia and flagella associated protein 91 | Always | In 1 condition |
| IQCNIQ motif containing N | Always | In 1 condition |
| USP26ubiquitin specific peptidase 26 | Always | In 1 condition |
| CFAP69cilia and flagella associated protein 69 | Not recorded | In 1 condition |
| TTC29tetratricopeptide repeat domain 29 | Not recorded | In 1 condition |
How often is among people with one of the gene's conditions, the most often across them, as the Human Phenotype Ontology records it. These pages describe traits and the research behind them; they are not a diagnosis, and a doctor or genetic counsellor is the person to ask about symptoms.
Broader traits
Where this comes from
- The Human Phenotype Ontology, release 2026-09-01: the trait, its names, its definition and the genes linked to it. Find out more at hpo.jax.org.
- Data release 2026.10.16-c6eea6bf.
One test. A lifetime of answers.
From $449Free shipping · Results in 6–8 weeks