Aarskog-Scott Syndrome is a syndrome that - in some cases - may be considered an intersex variation, although many would say it causes intersex traits rather than being one in of itself. This syndrome effects both CTM and CTF individuals, however it is more likely to effect CTM individuals. Its rarity is unknown, as mild cases are theorized to go undiagnosed and without notice.
This syndrome can cause cryptorchidism, a misplaced clitoris (such as a clitoris that is below the vagina), and/or a shawl scrotum, putting many with this syndrome on the intersex spectrum.[1]
80-99% of those with this syndrome have broad feet, short feet, broad palms, small hands, camptodactyly within a finger, umbilical hernia, short stature, widely spaced eyes, and a drooping lower lip.
30-79% of those with this syndrome have a broad forehead, low set/rotated ears, external ear malformation, a wide nasal bridge, an upturned nasal tip, a long philtrum, a drooping upper eyelid, downslanting eyelids, cognitive impairment, and/or hyperelastic skin.
5-29% of those with this syndrome have abnormal vertebral segmentation and fusion, ADHD, a cleft palate, a cleft lip, epicanthus, cross eyes, an enlarged cornea, delayed teeth growth, jaw abnormalities, a round face, a short neck, a funnel chest, cardiac failure, a back knee, and/or flat feet.
Those with this syndrome may or may not experience a delayed puberty or symptoms that are similar but not quite the same as the ones listed above. Some of the symptoms may classify one with this syndrome as physically disabled.
Causes
Mutations in the FGD1 gene are the only known genetic cause of Aarskog-Scott syndrome. The FGD1 gene provides instructions for making a protein that turns on (activates) another protein called Cdc42, which transmits signals that are important for various aspects of development before and after birth. This abnormality causes a change of genetic development, starting from in the fetal state. Only 20% have this mutation as the cause of the syndrome; it is unknown what causes this syndrome in individuals who do not FGD1 gene mutations.[2]