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2015 ; 5
(ä): 10423
Nephropedia Template TP
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Unique somatic and malignant expression patterns implicate PIWI-interacting RNAs
in cancer-type specific biology
#MMPMID26013764
Martinez VD
; Vucic EA
; Thu KL
; Hubaux R
; Enfield KS
; Pikor LA
; Becker-Santos DD
; Brown CJ
; Lam S
; Lam WL
Sci Rep
2015[May]; 5
(ä): 10423
PMID26013764
show ga
Human PIWI-interacting RNAs (piRNAs) are known to be expressed in germline cells,
functionally silencing LINEs and SINEs. Their expression patterns in somatic
tissues are largely uncharted. We analyzed 6,260 human piRNA transcriptomes
derived from non-malignant and tumour tissues from 11 organs. We discovered that
only 273 of the 20,831 known piRNAs are expressed in somatic non-malignant
tissues. However, expression patterns of these piRNAs were able to distinguish
tissue-of-origin. A total of 522 piRNAs are expressed in corresponding tumour
tissues, largely distinguishing tumour from non-malignant tissues in a
cancer-type specific manner. Most expressed piRNAs mapped to known transcripts,
contrary to "piRNA clusters" reported in germline cells. We showed that piRNA
expression can delineate clinical features, such as histological subgroups,
disease stages, and survival. PiRNAs common to many cancer types might represent
a core gene-set that facilitates cancer growth, while piRNAs unique to individual
cancer types likely contribute to cancer-specific biology.