Prader-Willi syndrome due to translocation

Prader-Willi syndrome due to translocation (Orphanet code 177907) is a rare genetic subtype of Prader-Willi syndrome (PWS) caused by a chromosomal translocation involving the 15q11-q13 region. This translocation disrupts or leads to loss of function of paternally expressed genes in the PWS critical region on chromosome 15, producing the same clinical phenotype as other genetic mechanisms of PWS. Like all forms of Prader-Willi syndrome, this condition is characterized by severe neonatal hypotonia and feeding difficulties in infancy, followed by the development of hyperphagia (excessive appetite) and progressive obesity beginning in early childhood if caloric intake is not carefully managed. The syndrome affects multiple body systems. Key features include short stature due to growth hormone deficiency, hypogonadism leading to incomplete pubertal development and infertility, mild to moderate intellectual disability, behavioral problems (including temper tantrums, stubbornness, and obsessive-compulsive tendencies), and characteristic facial features such as a narrow forehead, almond-shaped eyes, and a thin upper lip. Individuals may also have small hands and feet, scoliosis, and sleep disturbances including obstructive sleep apnea. Management of Prader-Willi syndrome due to translocation follows the same multidisciplinary approach used for all forms of PWS. Growth hormone therapy is a standard treatment that improves height, body composition, and muscle tone. Strict dietary supervision and environmental food controls are essential to prevent life-threatening obesity. Additional interventions include sex hormone replacement therapy, behavioral management, speech and occupational therapy, and monitoring for complications such as type 2 diabetes, scoliosis, and sleep-disordered breathing. The translocation mechanism is rare among PWS cases, with the majority caused by paternal deletion or maternal uniparental disomy. Genetic counseling is important, as the recurrence risk may differ from other PWS subtypes depending on the specific translocation involved.

Common questions about Prader-Willi syndrome due to translocation