2023
DOI: 10.1007/s00415-023-11890-0
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Understanding the genetic mechanisms and cognitive impairments in Down syndrome: towards a holistic approach

Yara Abukhaled,
Kenana Hatab,
Mohammad Awadhalla
et al.

Abstract: The most common genetic cause of intellectual disability is Down syndrome (DS), trisomy 21. It commonly results from three copies of human chromosome 21 (HC21). There are no mutations or deletions involved in DS. Instead, the phenotype is caused by altered transcription of the genes on HC21. These transcriptional variations are responsible for a myriad of symptoms affecting every organ system. A very debilitating aspect of DS is intellectual disability (ID). Although tremendous advances have been made to try a… Show more

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Cited by 4 publications
(2 citation statements)
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“…Children with Down syndrome exhibit a range of malformations in addition to cognitive impairments resulting from the presence of extra genetic material from chromosome 21 [18,19]. Although the phenotype varies, common characteristics that can lead experts to suspect Down syndrome includes reduced muscular tone (hypotonia), a brachycephalic head shape, a flat nasal bridge, epicanthal folds, the presence of Brushfield spots in the iris, a small mouth, small ears, excess skin at the back of the neck, upward-slanting palpebral fissures, a short fifth finger, a single transverse palmar crease, clinodactyly (abnormal curvature of the fifth finger), and wide spacing between the first and second toes, often accompanied by a deep groove between them [20,21].…”
Section: Introductionmentioning
confidence: 99%
“…Children with Down syndrome exhibit a range of malformations in addition to cognitive impairments resulting from the presence of extra genetic material from chromosome 21 [18,19]. Although the phenotype varies, common characteristics that can lead experts to suspect Down syndrome includes reduced muscular tone (hypotonia), a brachycephalic head shape, a flat nasal bridge, epicanthal folds, the presence of Brushfield spots in the iris, a small mouth, small ears, excess skin at the back of the neck, upward-slanting palpebral fissures, a short fifth finger, a single transverse palmar crease, clinodactyly (abnormal curvature of the fifth finger), and wide spacing between the first and second toes, often accompanied by a deep groove between them [20,21].…”
Section: Introductionmentioning
confidence: 99%
“…In neonates, Down syndrome is the most common genetic cause of intellectual disability; it affects approximately 1 in every 700 children, and accounts for around 15-20% of the intellectually disabled population. 27 The condition was first described by an English doctor, John Langdon Down, 28 and was subsequently associated with the trisomy of chromosome 21 by Professor Jerome Lejeune, a geneticist in Paris. 29,30 Since then, other less frequently seen forms of the condition have been discovered.…”
mentioning
confidence: 99%