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Trait

Absent zona pellucida

Lack of the oocyte extracellular matrix region (zona pellucida). This feature can be observed following follicular aspiration (retrieval of eggs for fertility treatments).

HPO HP:6000328

Summary

Body system
Abnormal cellular phenotype

1 gene linked to Absent zona pellucida

Changes in these genes cause rare conditions in which Absent zona pellucida 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.

GeneHow often it is seenConditions
ZP1zona pellucida glycoprotein 1AlwaysIn 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

Abnormal zona pellucida morphology

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.

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