Xp22.3 microdeletion syndrome

Xp22.3 microdeletion syndrome, also known as contiguous gene deletion syndrome of Xp22.3, is a rare chromosomal disorder caused by the deletion of a small segment of genetic material on the short arm of the X chromosome at position 22.3. This region contains several important genes, including STS (steroid sulfatase), KAL1 (associated with Kallmann syndrome), and other genes whose loss contributes to a variable clinical presentation depending on the size and exact location of the deletion. The syndrome is sometimes referred to as X-linked ichthyosis-associated contiguous gene deletion syndrome. The clinical features depend on which genes are included in the deletion. The most common manifestation is X-linked ichthyosis (dry, scaly skin) due to loss of the STS gene. When the deletion extends to involve neighboring genes, additional features may include Kallmann syndrome (hypogonadotropic hypogonadism with anosmia), short stature, chondrodysplasia punctata, intellectual disability, and ocular albinism. Some patients may also present with attention deficit disorder or autism spectrum features. Because the condition is X-linked, males are predominantly and more severely affected, while female carriers may show mild or no symptoms. Management is symptomatic and multidisciplinary. Ichthyosis is treated with emollients and keratolytic agents. Kallmann syndrome may require hormone replacement therapy to induce puberty and maintain fertility. Short stature and skeletal abnormalities are monitored and managed by endocrinologists and orthopedic specialists. Developmental delays and behavioral concerns benefit from early intervention programs, speech therapy, and educational support. Genetic counseling is recommended for affected families to understand recurrence risks and carrier status.

Common questions about Xp22.3 microdeletion syndrome