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A Generic Assay to Detect Aberrant ARSB Splicing and mRNA Degradation for the Molecular Diagnosis of MPS VI.


ABSTRACT: Identification and characterization of disease-associated variants in monogenic disorders is an important aspect of diagnosis, genetic counseling, prediction of disease severity, and development of therapy. However, the effects of disease-associated variants on pre-mRNA splicing and mRNA degradation are difficult to predict and often missed. Here we present a generic assay for unbiased identification and quantification of arylsulfatase B (ARSB) mRNA for molecular diagnosis of patients with mucopolysaccharidosis VI (MPS VI). We found that healthy control individuals have inefficient ARSB splicing because of natural skipping of exon 5 and inclusion of two pseudoexons in introns 5 and 6. Analyses of 12 MPS VI patients with 10 different genotypes resulted in identification of a 151-bp intron inclusion caused by the c.1142+2T>C variant and detection of low ARSB expression from alleles with the c.629A>G variant. A special case showed skipping of exon 4 and low ARSB expression. Although no disease-associated DNA variant could be identified in this patient, the molecular diagnosis could be made based on RNA. These results highlight the relevance of RNA-based analyses to establish a molecular diagnosis of MPS VI. We speculate that inefficient natural splicing of ARSB may be a target for therapy based on promotion of canonical splicing.

SUBMITTER: Broeders M 

PROVIDER: S-EPMC7648089 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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A Generic Assay to Detect Aberrant <i>ARSB</i> Splicing and mRNA Degradation for the Molecular Diagnosis of MPS VI.

Broeders Mike M   Smits Kasper K   Goynuk Busra B   Oussoren Esmee E   van den Hout Hannerieke J M P HJMP   Bergsma Atze J AJ   van der Ploeg Ans T AT   Pijnappel W W M Pim WWMP  

Molecular therapy. Methods & clinical development 20200916


Identification and characterization of disease-associated variants in monogenic disorders is an important aspect of diagnosis, genetic counseling, prediction of disease severity, and development of therapy. However, the effects of disease-associated variants on pre-mRNA splicing and mRNA degradation are difficult to predict and often missed. Here we present a generic assay for unbiased identification and quantification of arylsulfatase B (<i>ARSB</i>) mRNA for molecular diagnosis of patients wit  ...[more]

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