Table 1.

Types of described snoRNA retaining transcripts (snoRTs)

Name	snoRNA box	Localization	Size (Kb)	Poly (A)	Involvement in disease	References
sno-lncRNA	C/D - H/ACA	Nucleus	12 - 22	No	Prader-Willi Syndrome	(125)
SLERT	H/ACA	Nucleolus	0.7	No	Development of neoplastic features	(126,127)
SPA RNA	C/D	Nucleus	16–34	Yes	Prader-Willi Syndrome	(128)
C/D snoRT - cSPA	C/D	Cytoplasm	1.3–1.8	Yes	Aberrant ribosomal biogenesis	(129)
H/ACA snoRT - cSPA	H/ACA	Cytoplasm	0.3–10	Yes	Estrogen independent tumor progression	(130)
slb-snoRNA	C/D–H/ACA	Cytoplasm	0.3–1.2	No	Regulation of snoRNAs expression in cancer cells	(131)
LNC-SNO49AB	C/D	Nucleolus	0.8	No	Leukemia progression	(132)