A novel mutation in IRF6 resulting in VWS-PPS spectrum disorder with renal aplasia

Area of Science:

• Genetics
• Developmental Biology
• Clinical Medicine

Background:

• Popliteal pterygium syndrome (PPS) and Van der Woude syndrome (VWS) are rare genetic disorders.
• Both syndromes are associated with mutations in the interferon regulatory factor 6 (IRF6) gene.
• Clinical manifestations include orofacial clefting, lip pits, and various skeletal, genital, and skin abnormalities.

Observation:

• A patient presented with unilateral cleft lip and palate, ankyloblepharon, paramedian lip pits, unilateral renal aplasia, and coronal hypospadias.
• Genetic sequencing identified a novel missense mutation (Arg339Ile) in the IRF6 gene in the patient.
• Family members, including a brother with hypospadias, were unaffected and lacked IRF6 mutations.

Findings:

• The novel IRF6 mutation (Arg339Ile) is identified as a potential cause for the patient's complex phenotype.
• The inheritance pattern appears sporadic, as unaffected parents and relatives lack the mutation.
• The patient and his sibling were conceived via in vitro fertilization (IVF).

Implications:

• This case expands the known spectrum of IRF6-related disorders.
• The findings raise questions about the potential role of IRF6 mutations in renal malformations.
• Further research is needed to clarify the contribution of IVF versus genetic factors to observed anomalies.