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A branch site mutation leading to aberrant splicing of the human tyrosine hydroxylase gene in a child with a severe extrapyramidal movement disorder

Published online by Cambridge University Press:  04 January 2001

R. J. R. J. JANSSEN ,
R. A. WEVERS ,
M. HÄUSSLER ,
J. A. F. M. LUYTEN ,
G. C. H. STEENBERGEN-SPANJERS ,
G. F. HOFFMANN ,
T. NAGATSU  and
L. P. W. J. VAN DEN HEUVEL
R. J. R. J. JANSSEN
Affiliation:
Laboratory of Pediatrics and Neurology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
R. A. WEVERS
Affiliation:
Laboratory of Pediatrics and Neurology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
M. HÄUSSLER
Affiliation:
Fruehdiagnosezentrum Wuerzburg, Centre for Children with Developmental Disorders and Handicaps, Wuerzburg, Germany
J. A. F. M. LUYTEN
Affiliation:
Laboratory of Pediatrics and Neurology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
G. C. H. STEENBERGEN-SPANJERS
Affiliation:
Laboratory of Pediatrics and Neurology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
G. F. HOFFMANN
Affiliation:
Department of Pediatrics I, University Pediatric Hospital, Heidelberg, Germany
T. NAGATSU
Affiliation:
Division of Molecular Genetics, Neurochemistry, Institute for Comprehensive Medical Science, Fujita Health University, Toyoake Aichi, Japan
L. P. W. J. VAN DEN HEUVEL
Affiliation:
Laboratory of Pediatrics and Neurology, University Medical Centre Nijmegen, Nijmegen, The Netherlands
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Abstract

We report a branch site mutation in the gene of the enzyme tyrosine hydroxylase (TH): a −24t > a substitution two bases upstream of the adenosine in the branchpoint sequence (BPS) of intron 11. As normal lariat formation is therefore prevented, alternative splicing takes place: use of the BPS of intron 12 results in skipping of exon 12, whereas the use of a cryptic branch site in intron 11 leads to partial retention of this intron in the mRNA. This leads in both cases to an aberrant protein product. In the one case, skipping of exon 12 results in the absence of 32 amino acids. In the other, retention of 36 nucleotides of intron 11 in the mRNA results in the incorporation of twelve additional amino acids. The functional consequences of this mutation for the patient, who is also heterozygous for another previously identified mutation, become apparent in a severe clinical phenotype.

Type
Research Article
Information
Annals of Human Genetics , Volume 64 , Issue 5 , September 2000 , pp. 375 - 382
Copyright
© University College London 2000

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