Beckwith-Wiedemann syndrome due to 11p15 translocation/inversion

Beckwith-Wiedemann syndrome due to 11p15 translocation/inversion (BWS; Orphanet code 231130) is a specific genetic subtype of Beckwith-Wiedemann syndrome caused by chromosomal translocations or inversions involving the 11p15.5 region. This region contains critical imprinted genes, including IGF2 and CDKN1C (also known as p57KIP2), as well as the imprinting control regions IC1 and IC2. Structural rearrangements such as translocations or inversions at this locus can disrupt normal genomic imprinting, leading to the clinical features of BWS. This subtype is particularly notable because it is more frequently associated with maternal transmission and carries a higher recurrence risk in families compared to other molecular subtypes of BWS. Beckwith-Wiedemann syndrome is an overgrowth disorder that affects multiple body systems. Key clinical features include macrosomia (large body size at birth), macroglossia (enlarged tongue), abdominal wall defects such as omphalocele or umbilical hernia, visceromegaly (enlargement of abdominal organs including kidneys, liver, and spleen), hemihyperplasia (asymmetric overgrowth of one side of the body), neonatal hypoglycemia, ear anomalies (anterior ear lobe creases or posterior helical pits), and an increased risk of embryonal tumors, particularly Wilms tumor and hepatoblastoma. Renal abnormalities, including nephromegaly and structural kidney anomalies, may also occur. The severity and combination of features vary widely among affected individuals. Management of BWS due to 11p15 translocation/inversion is multidisciplinary and primarily supportive. Neonatal hypoglycemia requires prompt monitoring and treatment. Macroglossia may necessitate surgical intervention if it impairs feeding or breathing. Tumor surveillance protocols, including regular abdominal ultrasound screening (typically every three months until approximately age seven or eight), are critical for early detection of embryonal tumors. Genetic counseling is especially important in this subtype given the elevated familial recurrence risk associated with balanced chromosomal rearrangements. With appropriate monitoring and management, the prognosis for most individuals with BWS improves significantly after early childhood, as the risk of tumor development and hypoglycemia decreases with age.

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