Growth failure in focal dermal hypoplasia

Area of Science:

• Genetics
• Pediatrics
• Endocrinology

Background:

• Focal dermal hypoplasia (FDH) is a rare genetic disorder linked to PORCN gene mutations on the X chromosome.
• Short stature is a frequently observed clinical feature in FDH, but its underlying causes remain poorly understood.

Purpose of the Study:

• To investigate the specific etiologies of short stature in patients diagnosed with Focal dermal hypoplasia.
• To differentiate between nutritional deficiencies and other potential causes of growth failure in FDH.

Main Methods:

• Assessment of growth charts, bone ages, and auxologic measurements in 16 FDH patients (ages 3-18).
• Evaluation of laboratory data for common causes of growth failure, dietary intake analysis, and growth hormone stimulation testing.

Main Results:

• 11 out of 16 patients exhibited short stature (height < -2 SD below mid-parental target height).
• Severe undernutrition (BMI < 5th percentile) was infrequent (4/16 patients).
• Laboratory findings did not indicate gastrointestinal, allergic, or autoimmune issues; however, 3 patients showed potential growth hormone deficiency.

Conclusions:

• Short stature is prevalent in FDH, but not consistently linked to severe undernutrition.
• Potential treatable conditions, such as growth hormone deficiency, may contribute to short stature in some FDH patients, warranting further investigation.