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Background

LINE-1 (long interspersed element-1) or L1-mediated retrotransposition is a potent force in human genome evolution and an occasional cause of human genetic disease. Since the first report of two de novo L1 insertions in the F8 gene causing hemophilia A, more than 50 L1-mediated retrotranspositional events have been identified as causing human genetic disease. However, a significant bias has generally militated against the detection of these pathological events at autosomal loci. Based upon this and other observations, we surmised that some previously unresolved cystic fibrosis chromosomes might carry hitherto undetected L1-mediated retrotranspositional insertions at the CFTR locus. This study represents an attempt to identify such mutational events.

Methods

100 previously unresolved cystic fibrosis chromosomes were carefully reanalyzed using quantitative high-performance liquid chromatography (QHPLC).

Results

Two simple Alu insertions were identified in the CFTR gene, within exons 16 and 17b respectively.

Conclusions

Our findings have not only revealed a previously unknown mutational mechanism responsible for cystic fibrosis but also represent an important addition to the already diverse spectrum of known CFTR gene mutations. Experience with the CFTR gene suggests that pathological L1-mediated retrotranspositional events may also have been overlooked at other gene loci and should always be considered in cases that appear to be refractory to analysis."xsd:string
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http://purl.uniprot.org/citations/17531547http://purl.uniprot.org/core/author"Cooper D.N."xsd:string
http://purl.uniprot.org/citations/17531547http://purl.uniprot.org/core/author"Chen J.M."xsd:string
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http://purl.uniprot.org/citations/17531547http://purl.uniprot.org/core/author"Macek M. Jr."xsd:string
http://purl.uniprot.org/citations/17531547http://purl.uniprot.org/core/author"Masson E."xsd:string
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http://purl.uniprot.org/citations/17531547http://purl.uniprot.org/core/author"Piskackova T."xsd:string
http://purl.uniprot.org/citations/17531547http://purl.uniprot.org/core/date"2008"xsd:gYear
http://purl.uniprot.org/citations/17531547http://purl.uniprot.org/core/name"J Cyst Fibros"xsd:string
http://purl.uniprot.org/citations/17531547http://purl.uniprot.org/core/pages"37-43"xsd:string
http://purl.uniprot.org/citations/17531547http://purl.uniprot.org/core/title"Detection of two Alu insertions in the CFTR gene."xsd:string
http://purl.uniprot.org/citations/17531547http://purl.uniprot.org/core/volume"7"xsd:string
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