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Hörtnagel, K. ; Prokisch, H.* ; Meitinger, T.

An isoform of hPANK2, deficient in pantothenate kinase-associated neurodegeneration, localizes to mitochondria.

Hum. Mol. Genet. 12, 321-327 (2003)
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Mutations in the human PANK2 gene have been shown to occur in autosomal-recessive pantothenate kinase-associated neurodegeneration, a syndrome originally described by Hallervorden and Spatz. The kinase catalyses the first and rate-limiting step in the biosynthesis of coenzyme A, a key molecule in energy metabolism. We have determined the exon-intron structure of the hPANK2 gene and identified two alternatively used first exons. The resulting transcripts encode distinct isoforms of hPANK2, one of which carries an N-terminal extension with a predicted mitochondrial targeting signal. An in vitro import assay and in vivo immunolocalization experiments demonstrate a mitochondrial localization of this isoform. We conclude that the symptoms observed in pantothenate kinase-associated neurodegeneration are caused by a deficiency of the mitochondrial isoform and postulate the existence of a complete intramitochondrial pathway for de novo synthesis of coenzyme A.
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Publication type Article: Journal article
Document type Scientific Article
Keywords COENZYME-A; SEQUENCES
ISSN (print) / ISBN 0964-6906
e-ISSN 1460-2083
Quellenangaben Volume: 12, Issue: 3, Pages: 321-327 Article Number: , Supplement: ,
Publisher Oxford University Press
Reviewing status Peer reviewed