Traits

Traits linked to DAZ1

deleted in azoospermia 1

The Human Phenotype Ontology links 7 traits to DAZ1, by body system: features seen in people with one of the gene's rare conditions.

Abnormality of the genitourinary system

Trait	How often it is seen
Abnormal sperm development	Very often (80–99%)
Decreased testicular size	Very often (80–99%)
Male infertility	Very often (80–99%)
Non-obstructive azoospermia	Very often (80–99%)
Low sperm count	Often (30–79%)
Undescended testes	Sometimes (5–29%)
Absent sperm in semen	Not recorded

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.

Where this comes from

The Human Phenotype Ontology, release 2026-09-01: the traits linked to DAZ1 and how often each is seen. Find out more at hpo.jax.org.

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