Costello Syndrome

Disease Overview

Costello Syndrome is a rare genetic disorder characterized by distinctive physical features, developmental delays, intellectual disabilities, and increased risk of certain medical complications. The syndrome affects multiple body systems and is caused by genetic mutations that impact cell growth and development.

Disease Category

RASopathy - a group of genetic disorders caused by mutations in genes within the RAS/MAPK cellular signaling pathway, which regulate cell growth, division, and differentiation.

Synonyms

Facio-cutaneous syndrome (FCS)
Costello lipodystrophy syndrome
HRAS-related Costello syndrome

Signs & Symptoms

Physical and developmental characteristics include:

Developmental Features: - Intellectual disability - Delayed motor and speech development - Global developmental delays

Physical Features: - Distinctive facial characteristics - Coarse facial appearance - Large mouth - Full lips - Thick nasal septum - Loose, soft skin with deep creases on palms and soles - Slow growth and short stature

Medical Complications: - Cardiac issues (cardiomyopathy, arrhythmias) - Feeding difficulties in infancy - Skeletal abnormalities (scoliosis) - Increased tumor risk (both benign and malignant) - Papillomas - Hyperflexibility of joints

Causes

Genetic Mechanism: - Caused by de novo mutations in the HRAS gene - Mutations typically occur spontaneously during reproductive cell formation or early embryonic development - Autosomal dominant inheritance pattern - Not usually inherited from parents

Affected Populations

Prevalence: 1 in 300,000 to 1 in 1.25 million individuals
Occurs across all ethnic groups
Equal gender distribution
Typically identified in early childhood

Disorders with Similar Symptoms

Noonan Syndrome
Cardiofaciocutaneous Syndrome
Beckwith-Wiedemann Syndrome
Kabuki Syndrome

Diagnosis

Diagnostic Approach: - Comprehensive clinical evaluation - Detailed physical examination - Genetic testing to confirm HRAS gene mutation - Molecular genetic testing - Cardiac and developmental assessments

Standard Therapies

Multidisciplinary Management: - Regular cardiac monitoring - Surgical interventions for tumors/skeletal issues - Speech therapy - Physical therapy - Occupational therapy - Nutritional support - Individualized educational planning

Clinical Trials and Studies

Current Research Focus: - Understanding genetic mechanisms - Developing targeted therapies - Long-term outcome studies - Resources: ClinicalTrials.gov, NIH rare disease databases

References

GeneReviews
National Organization for Rare Disorders (NORD)
American Journal of Medical Genetics
Journal of Medical Genetics

Programs & Resources

Costello Syndrome Family Network (CSFN)
MAGIC Foundation for Children's Growth
NIH Genetic and Rare Diseases Information Center
International RASopathy Network

Complete Report

Comprehensive information available through: - GeneReviews - Specialized medical genetics databases - Consultation with genetic specialists