Traits

Traits linked to PAX9

paired box 9

The Human Phenotype Ontology links 24 traits to PAX9, by body system: features seen in people with one of the gene's rare conditions.

Abnormality of head or neck

Trait	How often it is seen
Absence of adult molar	Always
Failure of development of more than six teeth	Always
Chewing difficulties	Very often (80–99%)
Absence of premolar	Often (30–79%)
Absence of six year molar	Often (30–79%)
Absence of upper lateral incisor	Often (30–79%)
Absent central incisor	Often (30–79%)
Bad bite	Often (30–79%)
Decreased length of dental roots	Often (30–79%)
Decreased size of tooth	Often (30–79%)
Delayed eruption of permanent teeth	Often (30–79%)
Delayed eruption of teeth	Often (30–79%)
Widely spaced teeth	Often (30–79%)
Abnormality of canine	Sometimes (5–29%)
Abnormality of dental shape	Sometimes (5–29%)
Abnormality of shape of baby molar	Sometimes (5–29%)
Absence of lower premolar	Sometimes (5–29%)
Cleft of the mouth	Sometimes (5–29%)
Decreased size of teeth	Sometimes (5–29%)
Outward turned lips	Sometimes (5–29%)
Peg-shaped maxillary lateral incisors	Sometimes (5–29%)
Short face	Sometimes (5–29%)
Taurodontia	Sometimes (5–29%)
Thin dental enamel	Sometimes (5–29%)

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 PAX9 and how often each is seen. Find out more at hpo.jax.org.

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