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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 ...
Clubfoot is a congenital or acquired defect where one or both feet are rotated inward and downward. [1][2] Congenital clubfoot is the most common congenital malformation of the foot with an incidence of 1 per 1000 births. [5] In approximately 50% of cases, clubfoot affects both feet, but it can present unilaterally causing one leg or foot to be ...
23 (2019) [1] Jordan's syndrome (JS) or PPP2R5D-related intellectual disability is a rare autosomal dominant neurodevelopmental disorder caused by de novo mutations in the PPP2R5D gene. [2] It is characterized by hypotonia, intellectual disability, and macrocephaly. [3] Children with JS may also have epilepsy or meet criteria for diagnosis with ...
Down syndrome is a genetic disorder that often results in distinct physical differences and intellectual disability. According to the Centers for Disease Control, each year about 6,000 babies are ...
The Pallister–Killian syndrome (PKS), also termed tetrasomy 12p mosaicism or the Pallister mosaic aneuploidy syndrome, is an extremely rare and severe genetic disorder. PKS is due to the presence of an extra and abnormal chromosome termed a small supernumerary marker chromosome (sSMC). sSMCs contain copies of genetic material from parts of ...
Genetics of Down syndrome. Down syndrome is a chromosomal abnormality characterized by the presence of an extra copy of genetic material on chromosome 21, either in whole (trisomy 21) or part (such as due to translocations). The effects of the extra copy varies greatly from individual to individual, depending on the extent of the extra copy ...
Adults with Down syndrome often develop chronic health problems, such as severe sleep apnea, digestive disorders, thyroid conditions, and obesity. Many develop Alzheimer’s disease in middle age.
Rheumatology. Grisel's syndrome is a non-traumatic subluxation of the atlanto-axial joint caused by inflammation of the adjacent tissues. This is a rare disease that usually affects children. Progressive throat and neck pain and neck stiffness can be followed by neurologic symptoms such as pain or numbness radiating to arms (radiculopathies).