Abstract:
BACKGROUND:Johanson-Blizzard syndrome (JBS, MIM #243800) is a very rare autosomal recessive disorder characterized by exocrine pancreatic insufficiency, nasal wing hypoplasia, hypodontia, and other abnormalities. JBS is caused by mutations of the UBR1 gene (MIM *605981), encoding a ubiquitin ligase of the N-end rule pathway. METHODS:Molecular findings in a total of 65 unrelated patients with a clinical diagnosis of JBS who were previously screened for UBR1 mutations by Sanger sequencing were reviewed and cases lacking a disease-causing UBR1 mutation on either one or both alleles were included in this study. In order to discover mutations that are not detectable by Sanger sequencing, we designed a probe set for multiplex ligation-dependent probe amplification (MLPA) analysis of the UBR1 gene and analyzed the copy number status of all 47 UBR1 exons. RESULTS:Our previous studies using Sanger sequencing could detect mutations in 93.1% of 130 disease-associated UBR1 alleles. Six patients with a highly suggestive clinical diagnosis of JBS and unsolved genotype were included in this study. MLPA analysis detected six alleles harboring exon deletions/duplications, thereby raising the mutation detection rate in the entire cohort to 97.7% (127/130 alleles). CONCLUSION:We conclude that single or multi-exon deletions or duplications account for a substantial proportion of JBS-associated UBR1 mutations.
journal_name
Mol Genet Genomic Medjournal_title
Molecular genetics & genomic medicineauthors
Sukalo M,Schäflein E,Schanze I,Everman DB,Rezaei N,Argente J,Lorda-Sanchez I,Deshpande C,Takahashi T,Kleger A,Zenker Mdoi
10.1002/mgg3.319subject
Has Abstractpub_date
2017-11-01 00:00:00pages
774-780issue
6issn
2324-9269journal_volume
5pub_type
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