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Trait

Increased upper to lower segment ratio

Elevated ratio between the upper and the lower segment of the body, where the lower segment is defined as the length between the top of pubic symphysis to floor, and the upper segment is defined as the top of head to top of pubic symphysis.

HPO HP:0012774

Summary

Body system
Growth abnormality

2 genes linked to Increased upper to lower segment ratio

Changes in these genes cause rare conditions in which Increased upper to lower segment ratio 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
FBN2fibrillin 2AlwaysIn 1 condition
FGD1FYVE, RhoGEF and PH domain containing 1Not recordedIn 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 upper to lower segment ratio

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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