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2017 ; 8
(ä): 15824
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Genetic diagnosis of Mendelian disorders via RNA sequencing
#MMPMID28604674
Kremer LS
; Bader DM
; Mertes C
; Kopajtich R
; Pichler G
; Iuso A
; Haack TB
; Graf E
; Schwarzmayr T
; Terrile C
; Ko?a?íková E
; Repp B
; Kastenmüller G
; Adamski J
; Lichtner P
; Leonhardt C
; Funalot B
; Donati A
; Tiranti V
; Lombes A
; Jardel C
; Gläser D
; Taylor RW
; Ghezzi D
; Mayr JA
; Rötig A
; Freisinger P
; Distelmaier F
; Strom TM
; Meitinger T
; Gagneur J
; Prokisch H
Nat Commun
2017[Jun]; 8
(ä): 15824
PMID28604674
show ga
Across a variety of Mendelian disorders, ?50-75% of patients do not receive a
genetic diagnosis by exome sequencing indicating disease-causing variants in
non-coding regions. Although genome sequencing in principle reveals all genetic
variants, their sizeable number and poorer annotation make prioritization
challenging. Here, we demonstrate the power of transcriptome sequencing to
molecularly diagnose 10% (5 of 48) of mitochondriopathy patients and identify
candidate genes for the remainder. We find a median of one aberrantly expressed
gene, five aberrant splicing events and six mono-allelically expressed rare
variants in patient-derived fibroblasts and establish disease-causing roles for
each kind. Private exons often arise from cryptic splice sites providing an
important clue for variant prioritization. One such event is found in the complex
I assembly factor TIMMDC1 establishing a novel disease-associated gene. In
conclusion, our study expands the diagnostic tools for detecting non-exonic
variants and provides examples of intronic loss-of-function variants with
pathological relevance.