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Effects of intronic mutations in the LDLR gene on pre-mRNA splicing: Comparison of wet-lab and bioinformatics analyses.

Abstract：

:Screening for mutations in the low density lipoprotein receptor (LDLR) gene has identified more than 1000 mutations as the cause of familial hypercholesterolemia (FH). In addition, numerous intronic mutations with uncertain effects on pre-mRNA splicing have also been identified. In this study, we have selected 18 intronic mutations in the LDLR gene for comprehensive studies of their effects on pre-mRNA splicing. Epstein-Barr virus (EBV) transformed lymphocytes from subjects heterozygous for these mutations were established and mRNA was studied by Northern blot analyses and reverse transcription polymerase chain reactions. Furthermore, functional studies of the LDLRs were performed by flow cytometry. The results of the wet-lab analyses were compared to the predictions obtained from bioinformatics analyses using the programs MaxEntScan, NetGene2 and NNSplice 0.9, which are commonly used software packages for prediction of abnormal splice sites. Thirteen of the 18 intronic mutations were found to affect pre-mRNA splicing in a biologically relevant way as determined by wet-lab analyses. Skipping of one or two exons was observed for eight of the mutations, intron inclusion was observed for four of the mutations and activation of a cryptic splice site was observed for two of the mutations. Transcripts from eight of the mutant alleles were subjected to degradation. The computational analyses of the normal and mutant splice sites, predicted abnormal splicing with a sensitivity of 100% and a specificity of 60%. Thus, bioinformatics analyses are valuable tools as a first screening of the effects of intronic mutations in the LDLR gene on pre-mRNA splicing.

journal_name

Mol Genet Metab

journal_title

Molecular genetics and metabolism

authors

Holla ØL,Nakken S,Mattingsdal M,Ranheim T,Berge KE,Defesche JC,Leren TP

doi

10.1016/j.ymgme.2008.12.014

subject

Has Abstract

pub_date

2009-04-01 00:00:00

pages

245-52

issue

4

eissn

1096-7192

issn

1096-7206

pii

S1096-7192(08)00477-0

journal_volume

96

pub_type

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