CHARGE syndrome: a recurrent hotspot of mutations in CHD7 IVS25 analyzed by bioinformatic tools and minigene assays

CHARGE syndrome is a rare genetic disorder mainly due to de novo and private truncating mutations of CHD7 gene. Here we report an intriguing hot spot of intronic mutations (c.5405-7G > A, c.5405-13G > A, c.5405-17G > A and c.5405-18C > A) located in CHD7 IVS25. Combining computational in...

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Published in:European journal of human genetics : EJHG 2018-02, Vol.26 (2), p.287-292
Main Authors: Legendre, Marine, Rodriguez-Ballesteros, Montserrat, Rossi, Massimiliano, Abadie, Véronique, Amiel, Jeanne, Revencu, Nicole, Blanchet, Patricia, Brioude, Frédéric, Delrue, Marie-Ange, Doubaj, Yassamine, Sefiani, Abdelaziz, Francannet, Christine, Holder-Espinasse, Muriel, Jouk, Pierre-Simon, Julia, Sophie, Melki, Judith, Mur, Sébastien, Naudion, Sophie, Fabre-Teste, Jennifer, Busa, Tiffany, Stamm, Stephen, Lyonnet, Stanislas, Attie-Bitach, Tania, Kitzis, Alain, Gilbert-Dussardier, Brigitte, Bilan, Frédéric
Format: Article
Language:English
Subjects:
Brief Communication
CHARGE syndrome
CHARGE Syndrome - genetics
Child
Computational Biology - methods
Computer applications
DNA Helicases - genetics
DNA-Binding Proteins - genetics
Genetic disorders
Humans
Male
Mutation
Mutation hot spots
Real-Time Polymerase Chain Reaction - methods
RNA Splice Sites
Sequence Analysis, DNA - methods
Splicing
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Summary:CHARGE syndrome is a rare genetic disorder mainly due to de novo and private truncating mutations of CHD7 gene. Here we report an intriguing hot spot of intronic mutations (c.5405-7G > A, c.5405-13G > A, c.5405-17G > A and c.5405-18C > A) located in CHD7 IVS25. Combining computational in silico analysis, experimental branch-point determination and in vitro minigene assays, our study explains this mutation hot spot by a particular genomic context, including the weakness of the IVS25 natural acceptor-site and an unconventional lariat sequence localized outside the common 40 bp upstream the acceptor splice site. For each of the mutations reported here, bioinformatic tools indicated a newly created 3' splice site, of which the existence was confirmed using pSpliceExpress, an easy-to-use and reliable splicing reporter tool. Our study emphasizes the idea that combining these two complementary approaches could increase the efficiency of routine molecular diagnosis.
ISSN:1018-4813
1476-5438
DOI:10.1038/s41431-017-0007-0