Human Molecular Genetics, 2001, Vol. 10, No. 8 797-806
© 2001 Oxford University Press
Functional hemizygosity of PAFAH1B3 due to a PAFAH1B3CLK2 fusion gene in a female with mental retardation, ataxia and atrophy of the brain
1Max-Planck-Institut für Molekulare Genetik, Ihnestrasse 73, D-14195 Berlin-Dahlem, Germany, 2FB Biologie, Universität Kaiserslautern, Kaiserslautern, Germany, 3Department of Health Chemistry, University of Tokyo, Japan, 4Ottawa Regional Cancer Centre, Ottawa, Canada, 5Institut für Humangenetik, Freie Universität Berlin, Berlin, Germany, 6Lawrence Livermore National Laboratory, Livermore, CA, USA, 7Department of Medical Genetics, IMBG, Copenhagen, Denmark and 8Department of Human Genetics, University Hospital, Nijmegen, The Netherlands
We report on the molecular characterization of a translocation t(1;19)(q21.3;q13.2) in a female with mental retardation, ataxia and atrophy of the brain. Sequence analysis of the breakpoints revealed an Alu-repeat-mediated mechanism of recombination that led to truncation of two genes: the kinase CLK2 and PAFAH1B3, the gene product of which interacts with LIS1 as part of a heterotrimeric G protein complex PAFAH1B. In addition, two reciprocal fusion genes are present. One expressed fusion gene encodes the first 136 amino acids of PAFAH1B3 followed by the complete CLK2 protein. Truncated PAFAH1B3 protein lost its potential to interact with LIS1 whereas CLK2 activity was conserved within the fusion protein. These data emphasize the importance of PAFAH1B in brain development and functioning and demonstrate the first fusion gene apparently not associated with cancer.
+ To whom correspondence should be addressed at: Max-Planck-Institut für Molekulare Genetik, Ihnestrasse 73, D-14195 Berlin-Dahlem, Germany; Tel: +49 30 8413 1240; Fax: +49 30 8413 1383; Email: ropers@molgen.mpg.de
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