question: List T-UCRs that have been implicated in breast cancer
answer: Long non-coding RNAs (lncRNAs) are transcripts longer than 200 bp with no protein-coding capacity. Transcribed ultraconserved regions (T-UCRs) are a type of lncRNA and are conserved among human, chick, dog, mouse and rat genomes. These sequences are involved in cancer biology and tumourigenesis. Overexpression of one specific T-UCRs named uc.63 is associated with bad outcome in luminal A subtype of breast cancer patients. Uc.38 negatively regulates the expression of the pre-B-cell leukaemia homeobox 1 (PBX1) protein and subsequently affects the expression of Bcl-2 family members, ultimately inducing breast cancer cell apoptosis.