Baller-Gerold syndrome

Baller-Gerold syndrome (BGS), also known as craniosynostosis-radial aplasia syndrome, is a rare genetic disorder characterized by the combination of craniosynostosis (premature fusion of one or more skull sutures) and radial ray defects affecting the upper limbs. The craniosynostosis most commonly involves the coronal sutures, leading to an abnormal skull shape (brachycephaly or turricephaly), while the radial ray anomalies range from hypoplasia or aplasia of the radius to absent or malformed thumbs and shortened forearms. Additional features may include growth retardation, poikiloderma (patchy skin changes with redness, thinning, and altered pigmentation), and, less frequently, other skeletal anomalies such as vertebral or rib defects. Baller-Gerold syndrome is caused by biallelic pathogenic variants in the RECQL4 gene on chromosome 8q24.3, which encodes a RecQ family DNA helicase important for DNA replication and repair. Mutations in RECQL4 are also associated with Rothmund-Thomson syndrome and RAPADILINO syndrome, creating a spectrum of overlapping conditions. The presence of poikiloderma in some BGS patients highlights this phenotypic overlap. Affected individuals may also present with facial dysmorphism including prominent forehead, midface hypoplasia, and a small mouth. Management of Baller-Gerold syndrome is multidisciplinary and symptomatic. Craniosynostosis typically requires surgical intervention in infancy to prevent increased intracranial pressure and to improve skull shape. Orthopedic and hand surgery consultations are important for addressing limb anomalies and optimizing hand function. Dermatologic monitoring is recommended for patients with poikiloderma, and surveillance for potential malignancies may be considered given the association of RECQL4 mutations with cancer predisposition. Genetic counseling is essential for affected families. There is currently no cure or disease-specific therapy for this condition.

Common questions about Baller-Gerold syndrome