RGD Reference Report - Benign hereditary chorea: dopaminergic brain imaging in patients with a novel intronic NKX2.1 gene mutation. - Rat Genome Database

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Benign hereditary chorea: dopaminergic brain imaging in patients with a novel intronic NKX2.1 gene mutation.

Authors: Konishi, Takashi  Kono, Satoshi  Fujimoto, Masaya  Terada, Tatsuhiro  Matsushita, Kozo  Ouchi, Yasuomi  Miyajima, Hiroaki 
Citation: Konishi T, etal., J Neurol. 2013 Jan;260(1):207-13. doi: 10.1007/s00415-012-6618-z. Epub 2012 Jul 24.
RGD ID: 12914772
Pubmed: PMID:22825795   (View Abstract at PubMed)
DOI: DOI:10.1007/s00415-012-6618-z   (Journal Full-text)

Mutations in the NKX2.1 gene, which is essential for the development, differentiation and organization of the basal ganglia, cause benign hereditary chorea (BHC) characterized by childhood-onset non-progressive chorea. We herein report the clinical features of six patients from a single family with a novel intronic mutation and present the dopaminergic neuronal imaging by using positron emission tomography (PET) imaging to assess the integrity of the striatal dopaminergic system using [(11)C]-CFT for the presynaptic dopamine transporter function and [(11)C]-raclopride for the postsynaptic D2 receptor function. The patients showed mild generalized chorea without either congenital hypothyroidism or a history of pulmonary infection and some of the patients had goiter. Genetic analyses of NKX2.1 gene showed a novel heterozygous c.464-9C>A mutation that created a new acceptor splice site resulting in the production of an aberrant transcript with a 7-bp insertion identical to a intronic sequence of genomic DNA. Oral levodopa failed to improve the involuntary movement, while haloperidol, a dopamine D2 receptor blocking agent, exacerbated the choric movement in a single patient. The dopaminergic PET studies in the two patients revealed decreased raclopride binding in the striatum, while the CFT binding was not altered. The impairment of D2 receptor function in the basal ganglia may result in exacerbation of the chorea induced by haloperidol. The molecular brain imaging and therapeutic response may help elucidate the pathophysiological mechanism of the motor control in the BHC-associated NKX2.1 mutation.



RGD Manual Disease Annotations    Click to see Annotation Detail View

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
NKX2-1HumanBenign Familial Chorea  IAGP DNA:splice-site mutation:intron:c.464-9C>A (human)RGD 
Nkx2-1RatBenign Familial Chorea  ISONKX2-1 (Homo sapiens)DNA:splice-site mutation:intron:c.464-9C>A (human)RGD 
Nkx2-1MouseBenign Familial Chorea  ISONKX2-1 (Homo sapiens)DNA:splice-site mutation:intron:c.464-9C>A (human)RGD 

Objects Annotated

Genes (Rattus norvegicus)
Nkx2-1  (NK2 homeobox 1)

Genes (Mus musculus)
Nkx2-1  (NK2 homeobox 1)

Genes (Homo sapiens)
NKX2-1  (NK2 homeobox 1)


Additional Information