CAGE-seq analysis of osteoblast derived from cleidocranial dysplasia human induced pluripotent stem cells

• Published in: Bone (New York, N.Y.) N.Y.), 2020-12, Vol.141, p.115582-115582, Article 115582
• Main Authors: Ooki, Akio, Onodera, Shoko, Saito, Akiko, Oguchi, Akiko, Murakawa, Yasuhiro, Sakamoto, Teruo, Sueishi, Kenji, Nishii, Yasushi, Azuma, Toshifumi
• Format: Article
• Language: English
• Subjects: Cage-seq; Cleidocranial dysplasia (CCD); hiPSCs; Non-coding RNA; Osteoblast differentiation
• ISSN: 8756-3282; 1873-2763
• DOI: 10.1016/j.bone.2020.115582

Non-coding RNAs (ncRNAs) comprise a major portion of transcripts and serve an essential role in biological processes. Although the importance of major transcriptomes in osteogenesis has been extensively studied, the function of ncRNAs in human osteogenesis remains unclear. Previously, we developed hiPSCs from patients with cleidocranial dysplasia (CCD) caused by runt-related transcription factor 2 (RUNX2) haploinsufficiency. To gain insight into ncRNAs in osteogenesis, we surveyed differential ncRNA expression profiling and promoter differences of RUNX2 using patient-specific iPSCs and cap analysis gene expression (CAGE) technology to define the promoter landscape. Revertant iPSCs (Rev1 iPSCs) edited by CRISPR/Cas9 system to harbor mutation-corrected RUNX2 exhibited increased proximal promoter expression of RUNX2, while CCD iPSCs did not. We identified 2271 ncRNA genes with altered expression levels before and after differentiation, 31 of which showed at least 20-fold higher expression in Rev1 iPSCs. Bioinformatic analysis also categorized AC007392.3, LINC00379, RP11-122D10.1, and RP11-90J7.2 as enhancer regulatory regions, and HOXA-AS2, MIR219-2, and RP11-834C11.3 as dyadic regulatory regions of these ncRNAs. In addition, two miRNAs, termed MIR199A2 and MIR152, were found to have high enrichment of osteogenic-related terms. Upon further examination of the role of MIR152 on osteoblast differentiation, we found that MIR152 knockdown induced upregulation of ALP and COL1A1 in Saos-2 cells. Thus, ncRNAs were found to regulate the osteogenic differentiation potentials of hiPSCs that are used for bone regeneration and repair owing to their differentiation potentials. These data allow understanding ncRNA profiles of hiPSCs during osteogenesis. •The P2 RUNX2 promoter, but not P1, is activated in osteoblast differentiation.•CAGE analysis revealed total transcriptional profiles of CCD iPS.•A novel ncRNA involved osteoblast differentiation was identified.