Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0085631 (agitation)
 12,064 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Among the movement disorders associated with acanthocytosis, McLeod syndrome (McKusick 314850) is the one that is best characterized on the molecular level. Its defining feature is low reactivity of Kell erythrocyte antigens. This is due to absence of membrane protein KX that forms a complex with the Kell protein. KX is coded for by the XK gene on the X-chromosome. We present six males (aged 29 to 60 years), with proven XK mutations, to discuss the chorea associated with McLeod syndrome. The movement disorder commonly develops in the fifth decade and is progressive. It affects the limbs, the trunk and the face. In addition to facial grimacing, involuntary vocalization can be present. In early stages there may only be some restlessness or slight involuntary distal movements of ankles and fingers. Lip-biting and facial tics seem more common in autosomal recessive choreoacanthocytosis linked to chromosome 9. This, together with the absence of dysphagia in McLeod syndrome, may help in differential diagnosis. Recent findings suggest a role for the endothelin system of the striatum in the pathogenesis of McLeod syndrome.
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PMID:The chorea of McLeod syndrome. 1174 18

Mild myopathy is a common manifestation of the X-linked McLeod neuroacanthocytosis syndrome. We present a patient with McLeod syndrome and a primarily subclinical myopathy, who developed severe rhabdomyolysis with renal insufficiency after a prolonged period of excessive motor restlessness due to an agitated psychotic state and a single dose of clozapine. Other possible causes for rhabdomyolysis such as prolonged immobility, trauma, hyperthermia, generalized seizures, toxin exposure, or metabolic changes were excluded. Clinical course was favorable, with persistent slight elevation of serum creatine kinase levels caused by the underlying myopathy. Our findings suggest that McLeod myopathy is a predisposing factor for severe rhabdomyolysis. This possibly life-threatening condition should be added to the clinical spectrum of McLeod syndrome, and serum creatine kinase levels should be carefully monitored in patients with this syndrome, particularly if a hyperkinetic movement disorder is present or neuroleptic medication is used.
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PMID:Malignant McLeod myopathy. 1221 Mar 75

McLeod syndrome is one subtype of rare neuroacanthocytosis syndromes characterized by misshapen red blood cells and progressive degeneration of the basal ganglia. It is an X-linked recessive disorder with mutation in the XK gene of the Kell blood group system with multisystem involvements. Concerning the movement disorders, its dyskinesias are various and difficult to differentiate from those in Huntington's disease or other hyperkinetic movement disorders. In this report, we described a 62-year-old male patient presenting with insidious myalgia and muscle fatigue. Progressive motor restlessness and toes choreoathetosis were noted. Previously, he had chronic psychotic disorder with irregular treatment for 14 years. The laboratory tests revealed elevated creatine phosphokinase and acanthocytes (36.3%). The electrophysiological test demonstrated an axonal type polyneuropathy. The neuroimaging of brain showed striatal degeneration. Genetic analysis revealed a nonsense hemizygous mutation c.154C>T (p.Gln52X) at exon 1 of XK gene. The genetic counseling of his family revealed one elder brother carrying the same mutation and showing a similar but very mild syndrome. Several offspring were the asymptomatic carriers. We suggest that for a patient with multiple system disorders including dyskinetic movement disorders, psychiatric symptoms, polyneuropathy, and elevated CPK, a genetic test for XK gene mutation is highly indicated to confirm the McLeod syndrome and to guide the possible therapy.
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PMID:A novel XK gene mutation in a Taiwanese family with McLeod syndrome. 2463 91