Aarskog–Scott syndrome

Aarskog–Scott syndrome is a rare inherited developmental disorder, usually caused by variants in FGD1. It is characterized by distinctive facial features, short stature, and genital and skeletal differences.

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FGD1: FGD1 is a gene that encodes a protein involved in regulating cell growth and organization. Pathogenic variants in this gene cause most cases of Aarskog–Scott syndrome.
Rho GTPase: Rho GTPases are molecular switches that regulate cell shape, movement, and signaling. The FGD1 protein activates a Rho-family signaling pathway.
Clinical genetics: Clinical genetics applies genetic knowledge to diagnosis, counseling, and care. It guides assessment of suspected Aarskog–Scott syndrome and family implications.
Robinow syndrome: Robinow syndrome is a genetic disorder marked by distinctive facial features, short limbs, and vertebral differences. Its short stature and facial findings can overlap, but its causes and pattern differ.
X-linked inheritance: X-linked inheritance describes transmission of genetic variants on the X chromosome. FGD1 lies on the X chromosome, shaping how the syndrome is inherited.
Cell signaling: Cell signaling is the communication process by which cells detect and respond to molecular cues. Disrupted signaling offers a route from FGD1 variants to developmental differences.
Molecular genetic testing: Molecular genetic testing examines DNA for variants associated with disease. FGD1 testing can support diagnosis when clinical findings suggest the syndrome.
Noonan syndrome: Noonan syndrome is a genetic disorder affecting growth, facial development, and sometimes the heart. Both conditions can involve short stature and distinctive facial features, requiring clinical distinction.
Variant of uncertain significance: A variant of uncertain significance is a genetic change whose relationship to disease is not established. Some suspected cases lack a clearly disease-causing FGD1 result.
Skeletal development: Skeletal development is the formation and growth of bones and connective structures. Altered development contributes to the syndrome’s short stature and hand and foot differences.