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Prader-Willi Syndrome definition: An autosomal dominant disorder caused by deletion of the proximal long arm of the paternal chromosome 15 (15q11-q13) or by inheritance of both of the pair of chromosomes 15 from the mother (UNIPARENTAL DISOMY) which are imprinted (GENETIC IMPRINTING) and hence silenced. Clinical manifestations include MENTAL RETARDATION; MUSCULAR HYPOTONIA; HYPERPHAGIA; OBESITY; short stature; HYPOGONADISM; STRABISMUS; and HYPERSOMNOLENCE. (Menkes, Textbook of Child Neurology, 5th ed, p229)
Prader Willi syndrome definition: congenital neurobehavioral disorder characterized by rounded face, low forehead, almond shaped eyes, squinting, hypogonadism, hypotonia, insatiable appetite leading to obesity, and mental retardation; chromosomal disorder usually associated with a deletion of the proximal portion of the long arm of chromosome 15.
Prader-Willi Syndrome definition: A genetic syndrome caused by deletions or disruptions of chromosome 15. It is characterized by reduced fetal activity, mental retardation, hypotonia, short stature, and hypogonadism.
Prader-Willi syndrome (PWS) definition: A syndrome characterized at birth by the lack of spontaneous movements and protective reflexes, thus giving an appearance of severe brain damage. Profound hypotonia may cause asphyxia. Sucking and swallowing reflexes are absent or decreased. Deficient thermoregulation, amyotonia, and hypogonadism are usually associated. After a few weeks or months, the affected infants become more responsive and more alert. Areflexia disappears gradually but hypotonia may persist longer. This phase is marked mainly by mental subnormality, delayed growth and motor development, speech defect, lack of emotional control, voracious appetite leading to obesity, hypotonia, hyperlaxity, delayed bone maturation, and multiple orofacial and other disoders. There is a tendency to develop diabetes mellitus and cardiac failure in some patients. Pain insensitivity is common. Prader-Willi habitus associated with osteopenia and camptodactyly is known as the Urban-Rogers-Meyer syndrome.
NIPA1 Gene definition: This gene may be involved in the development of the nervous system.
NIPA2 Gene definition: This gene may play a role in prostate cancer.
NIPA1 wt Allele definition: Human NIPA1 wild-type allele is located in the vicinity of 15q11.2 and is approximately 43 kb in length. This allele, which encodes non-imprinted in Prader-Willi/Angelman syndrome region protein 1, may play a role in nervous system development. Mutations in the gene are associated with autosomal dominant spastic paraplegia 6.
NIPA2 wt Allele definition: Human NIPA2 wild-type allele is located in the vicinity of 15q11.2 and is approximately 29 kb in length. This allele, which encodes non-imprinted in Prader-Willi/Angelman syndrome region protein 2, may be involved in prostate cancer.
Non-Imprinted In Prader-Willi/Angelman Syndrome Region Protein 1 definition: Non-imprinted in Prader-Willi/Angelman syndrome region protein 1 (329 aa, ~35 kDa) is encoded by the human NIPA1 gene. This protein may be involved in the development of the nervous system.
Non-Imprinted In Prader-Willi/Angelman Syndrome Region Protein 2 definition: Non-imprinted in Prader-Willi/Angelman syndrome region protein 2 (360 aa, ~39 kDa) is encoded by the human NIPA2 gene. This protein may play a role in prostate cancer.
 
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