Abstract:
:Diverse mutations in the gene encoding the copper transporter ATP7A lead to X-linked recessive Menkes disease or occipital horn syndrome. Recently, two unique ATP7A missense mutations, T994I and P1386S, were shown to cause isolated adult-onset distal motor neuropathy. These mutations induce subtle defects in ATP7A intracellular trafficking resulting in preferential accumulation at the plasma membrane compared to wild-type ATP7A. Immunoprecipitation assays revealed abnormal interaction between ATP7A(T994I) and p97/VCP, a protein mutated in two autosomal dominant forms of motor neuron disease. Small-interfering RNA knockdown of valosin-containing protein corrected ATP7A(T994I) mislocalization. For ATP7A(P1386S) , flow cytometry documented that nonpermeabilized fibroblasts bound a C-terminal ATP7A antibody, suggesting unstable insertion of the eighth transmembrane segment due to a helix-breaker effect of the amino acid substitution. This could sabotage interaction of ATP7A(P1386S) with adaptor protein complexes. These molecular events appear to selectively disturb normal motor neuron function and lead to neurologic illness that takes years and sometimes decades to develop.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
Yi L,Kaler Sdoi
10.1111/nyas.12427subject
Has Abstractpub_date
2014-05-01 00:00:00pages
49-54eissn
0077-8923issn
1749-6632journal_volume
1314pub_type
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