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The chromosomal basis of Wolf-Hirschhorn syndrome (WHS) consists of a deletion of the most terminal portion of the short arm of chromosome 4. The deleted segment of reported individuals represent about one half of the p arm, occurring distal to the bands 4p15.1-p15.2. The proximal boundary of the WHSCR was defined by a 1.9 megabase terminal ...
A more uncommon cause for WHS is the formation of a ring chromosome. A ring chromosome can form when a chromosome breaks apart and forms a circular structure to fuse together. That process may initiate gene loss towards the ends of the chromosome. [9] Severity of symptoms and expressed phenotype differ based on the amount of genetic material ...
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Miller–Dieker syndrome, also called Miller–Dieker lissencephaly syndrome (MDLS) or chromosome 17p13.3 deletion syndrome, [1] is a micro deletion syndrome characterized by congenital malformations. Congenital malformations are physical defects detectable in an infant at birth which can involve many different parts of the body, including the ...
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When the chromosome's structure is altered, this can take several forms: [16] Deletions: A portion of the chromosome is missing or has been deleted. Known disorders in humans include Wolf–Hirschhorn syndrome, which is caused by partial deletion of the short arm of chromosome 4; and Jacobsen syndrome, also called the terminal 11q deletion ...
Most people with SMS have a deletion of genetic material from a specific region of chromosome 17 (17p11.2). Although this region contains multiple genes, recently researchers discovered that the loss of one particular gene, the retinoic acid induced 1 or RAI1 , is responsible for most of the characteristic features of this condition.
[30] [31] Weight loss is common in people with Huntington's disease, and it progresses with the disease. Juvenile HD generally progresses at a faster rate with greater cognitive decline, and chorea is exhibited briefly, if at all; the Westphal variant of slowness of movement , rigidity, and tremors is more typical in juvenile HD, as are seizures .