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8p23.1 duplication syndrome is a rare genetic disorder caused by a duplication of a region from human chromosome 8. [1] This duplication syndrome has an estimated prevalence of 1 in 64,000 births [1] and is the reciprocal of the 8p23.1 deletion syndrome. The 8p23.1 duplication is associated with a variable phenotype including one or more of ...
The most frequent reported symptoms in patients with 22q11.2 duplication syndrome are intellectual disability /learning disability (97% of patients), delayed psychomotor development (67% of patients), growth retardation (63% of patients) and muscular hypotonia (43% of patients). [ 1 ] However, these are common and relatively non-specific ...
9q34 deletion syndrome is a rare genetic disorder. Terminal deletions of chromosome 9q 34 have been associated with childhood hypotonia, a distinctive facial appearance and developmental disability. The facial features typically described include arched eyebrows, small head circumference, midface hypoplasia, prominent jaw and a pouting lower lip.
1q21.1 duplication syndrome, also known as 1q21.1 microduplication, is an uncommon copy number variant associated with several congenital abnormalities, including developmental delay, dysmorphic traits, autism spectrum disorder, and congenital cardiac defects. [1] Common facial features include frontal bossing, hypertelorism, and macrocephaly.
1 in 4,000 [ 7 ] DiGeorge syndrome, also known as 22q11.2 deletion syndrome, is a syndrome caused by a microdeletion on the long arm of chromosome 22. [ 7 ] While the symptoms can vary, they often include congenital heart problems, specific facial features, frequent infections, developmental disability, intellectual disability and cleft palate ...
Specialty. Medical genetics. 16p11.2 duplication syndrome is a genetic condition caused by duplication of region on chromosome 16. The odds of developing autism spectrum disorder are elevated and comparable to the rate with 16p11.2 deletion. The rate of having ADHD is higher than in people with deletion. [1][2]
22q13 deletion syndrome, known as Phelan–McDermid syndrome (PMS), is a genetic disorder caused by deletions or rearrangements on the q terminal end (long arm) of chromosome 22. Any abnormal genetic variation in the q13 region that presents with significant manifestations (phenotype) typical of a terminal deletion may be diagnosed as 22q13 ...
Fluorescence in situ hybridization. Koolen–De Vries syndrome (KdVS), also known as 17q21.31 microdeletion syndrome, is a rare genetic disorder caused by a deletion of a segment of chromosome 17 which contains six genes. This deletion syndrome was discovered independently in 2006 by three different research groups. [1][2][3][4]