PIK3R1 mutations in SHORT syndrome

Area of Science:

• Genetics
• Rare diseases
• Molecular biology

Background:

• SHORT syndrome is a rare autosomal-dominant disorder with diverse clinical manifestations including short stature, joint hyperextensibility, and ophthalmic anomalies.
• Recent studies identified heterozygous mutations in the PIK3R1 gene as a cause of SHORT syndrome.
• A specific recurrent missense mutation (c.1945C>T; p.Arg649Trp) was found in a significant proportion of affected families.

Observation:

• This report details two unrelated patients presenting with typical SHORT syndrome features.
• Both patients exhibited additional health issues, specifically pulmonary stenosis and ectopic kidney.
• Genetic analysis confirmed the presence of the c.1945C>T; p.Arg649Trp mutation in the PIK3R1 gene in both individuals, identified as de novo.

Findings:

• The study provides further evidence linking PIK3R1 mutations to the etiology of SHORT syndrome.
• The identified mutation (c.1945C>T; p.Arg649Trp) was found to be de novo in the reported patients.
• The clinical presentation in these patients broadens the spectrum of SHORT syndrome, including previously unassociated conditions.

Implications:

• These findings reinforce the role of PIK3R1 in SHORT syndrome pathogenesis.
• The recurrent mutation c.1945C>T; p.Arg649Trp is confirmed as a hotspot mutation, crucial for diagnostic considerations.
• Expanding the clinical spectrum aids in better diagnosis, management, and genetic counseling for individuals with SHORT syndrome and related disorders.