Disease Atlas / Disease detail

Fragile X syndrome

An atlas of FMR1 full mutation, variable development, learning and behavior, and specialized repeat-expansion testing.

fragile X syndrome · FXS

MONDO:0010383Public QA completeSource-bound · 4

Disease at a glance

Start with the essentials, then explore the patient and research views.

Public revision · a6c88fb6451b

Disease class: FXS is an inherited neurodevelopmental disorder.
Core mechanism: FMR1 full mutation and methylation are the main cause.
Genes or cause: Full mutations and premutations confer different risks.
Typical features: Developmental, speech, and learning delays are common.
Variability: Anxiety, attention, and autistic features can coexist.
Diagnosis: Sex and X inactivation influence phenotype.
Management: Specialized CGG-repeat and methylation testing establishes diagnosis.
Treatment and research: Standard exome testing can miss repeat expansion.
Reading evidence: Early developmental and educational intervention supports function.
Key caution: Behavior, sleep, and seizures receive symptom-specific care.

A structured guide for understanding the disease and preparing for clinical conversations.

FXS is an inherited neurodevelopmental disorder.

Developmental, speech, and learning delays are common.

FMR1 full mutation and methylation are the main cause.

Full mutations and premutations confer different risks.

Anxiety, attention, and autistic features can coexist.

Sex and X inactivation influence phenotype.

Specialized CGG-repeat and methylation testing establishes diagnosis.

Standard exome testing can miss repeat expansion.

Premutations require counseling about FXTAS and FXPOI.

Repeat size and family implications require genetic counseling.

This material is for disease education and is not a personal diagnosis or treatment instruction.

A trial registry status does not establish efficacy or regulatory approval.