Diagnosing Cornelia de Lange syndrome and related neurodevelopmental disorders using RNA sequencing.
Genet Med
; 22(5): 927-936, 2020 05.
Article
in En
| MEDLINE
| ID: mdl-31911672
ABSTRACT
PURPOSE:
Neurodevelopmental disorders represent a frequent indication for clinical exome sequencing. Fifty percent of cases, however, remain undiagnosed even upon exome reanalysis. Here we show RNA sequencing (RNA-seq) on human B-lymphoblastoid cell lines (LCL) is highly suitable for neurodevelopmental Mendelian gene testing and demonstrate the utility of this approach in suspected cases of Cornelia de Lange syndrome (CdLS).METHODS:
Genotype-Tissue Expression project transcriptome data for LCL, blood, and brain were assessed for neurodevelopmental Mendelian gene expression. Detection of abnormal splicing and pathogenic variants in these genes was performed with a novel RNA-seq diagnostic pipeline and using a validation CdLS-LCL cohort (n = 10) and test cohort of patients who carry a clinical diagnosis of CdLS but negative genetic testing (n = 5).RESULTS:
LCLs share isoform diversity of brain tissue for a large subset of neurodevelopmental genes and express 1.8-fold more of these genes compared with blood (LCL, n = 1706; whole blood, n = 917). This enables testing of more than 1000 genetic syndromes. The RNA-seq pipeline had 90% sensitivity for detecting pathogenic events and revealed novel diagnoses such as abnormal splice products in NIPBL and pathogenic coding variants in BRD4 and ANKRD11.CONCLUSION:
The LCL transcriptome enables robust frontline and/or reflexive diagnostic testing for neurodevelopmental disorders.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
De Lange Syndrome
/
Neurodevelopmental Disorders
Type of study:
Diagnostic_studies
Limits:
Humans
Language:
En
Journal:
Genet Med
Journal subject:
GENETICA MEDICA
Year:
2020
Document type:
Article
Affiliation country:
United States