Open AccessSevere Polycystic Liver Disease Is Not Caused by Large Deletions of the PRKCSH Gene
Author(s) -
Cnossen Wybrich R.,
Maurits Jake S.F.,
Salomon Jody,
te Morsche René H.M.,
Waanders Esmé,
Drenth Joost P. H.
Publication year - 2016
Publication title -
journal of clinical laboratory analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 50
eISSN - 1098-2825
pISSN - 0887-8013
DOI - 10.1002/jcla.21875
Subject(s) - multiplex ligation dependent probe amplification , biology , genetics , sanger sequencing , exon , polycystic liver disease , mutation , gene , microbiology and biotechnology , loss of heterozygosity , medicine , allele , transplantation , liver transplantation
Background Isolated polycystic liver disease (ADPLD) is an autosomal dominant Mendelian disorder. Heterozygous PRKCSH (where PRKCSH is protein kinase C substrate 80K‐H (80 kDa protein, heavy chain; MIM*177060) mutations are the most frequent cause. Routine molecular testing using Sanger sequencing identifies pathogenic variants in the PRKCSH (15%) and SEC63 (where SEC63 is Saccharomyces cerevisiae homolog 63 (MIM*608648); 6%) genes, but about approximately 80% of patients meeting the clinical ADPLD criteria carry no PRKCSH or SEC63 mutation. Cyst tissue often shows somatic deletions with loss of heterozygosity that was recently recognized as a general mechanism in ADPLD. We hypothesized that germline deletions in the PRKCSH gene may be responsible for hepatic cystogenesis in a significant number of mutation‐negative ADPLD patients. Methods In this study, we designed a multiplex ligation‐dependent probe amplification (MLPA) assay to screen for deletions of PRKCSH exons. Genomic DNA from 60 patients with an ADPLD phenotype was included. Results MLPA analysis detected no exon deletions in mutation‐negative ADPLD patients. Conclusion Large copy number variations on germline level are not present in patients with a clinical diagnosis of ADPLD. MLPA analysis of the PRKCSH gene should not be considered as a diagnostic method to explain hepatic cystogenesis.