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Trisomy 21. Down syndrome (also known by the karyotype 47,XX,+21 for females and 47,XY,+21 for males) [98] is mostly caused by a failure of the 21st chromosome to separate during egg or sperm development, known as nondisjunction. [91] As a result, a sperm or egg cell is produced with an extra copy of chromosome 21; this cell thus has 24 ...
Frequency. 1 in 1000 (1 in 2,000 severe disease) [4] Named after. Jacqueline Noonan. Noonan syndrome (NS) is a genetic disorder that may present with mildly unusual facial features, short height, congenital heart disease, bleeding problems, and skeletal malformations. [1] Facial features include widely spaced eyes, light-colored eyes, low-set ...
There are some distinct physical features that typically occur in individuals with Down syndrome: Flattened face. Upturned eyelids. Protruding tongue. Small head. Shorter stature. Intellectual ...
Rheumatology. Saethre–Chotzen syndrome (SCS), also known as acrocephalosyndactyly type III, is a rare congenital disorder associated with craniosynostosis (premature closure of one or more of the sutures between the bones of the skull). This affects the shape of the head and face, resulting in a cone-shaped head and an asymmetrical face.
Williams syndrome (WS), also Williams–Beuren syndrome (WBS), is a genetic disorder that affects many parts of the body. [2] Facial features frequently include a broad forehead, underdeveloped chin, short nose, and full cheeks. [2] Mild to moderate intellectual disability is observed in people with WS, with particular challenges with visual ...
Kabuki syndrome (previously known as Kabuki-makeup syndrome (KMS) or Niikawa–Kuroki syndrome) is a rare congenital disorder of genetic origin. [1] [2] It affects multiple parts of the body, with varying symptoms and severity, although the most common is the characteristic facial appearance. [3] Kabuki syndrome affects roughly one in 32,000 ...
A dysmorphic feature is an abnormal difference in body structure. It can be an isolated finding in an otherwise normal individual, or it can be related to a congenital disorder, genetic syndrome or birth defect. Dysmorphology is the study of dysmorphic features, their origins and proper nomenclature. One of the key challenges in identifying and ...
Here are amazing individuals with Down syndrome who are breaking the barriers of disability stigmas. Edward Barbanell. A comedian who has been in hit productions such as Workaholics and The Ringer ...