Scientists led by Dr. Gang Chen from The Chinese language College of Hong Kong, Shenzhen (CUHK-Shenzhen) have launched a brand new strategy to determine and work together with particular RNA constructions. Their research, featured in Cell Experiences Bodily Science, explains how specifically designed molecules referred to as dual-affinity peptide nucleic acids can concurrently connect to double-stranded RNA areas, that are sections of RNA the place two strands are paired collectively, and single-stranded RNA areas, the place the RNA stays unpaired, at their junctions.
RNA, an important molecule in residing organisms, helps perform varied features, together with regulating genes and producing proteins. Its advanced folded shapes, often known as secondary constructions, make it tough to focus on particular areas. Earlier strategies, resembling artificial molecules referred to as antisense oligonucleotides, which bind to particular RNA sequences to dam their operate, and comparable compounds, solely labored on single-stranded or loosely paired double-stranded RNA areas, leaving many different vital constructions untouchable. Twin-affinity peptide nucleic acids overcome this limitation by combining two sorts of focusing on mechanisms. One sort is designed for versatile single-stranded RNA, whereas the opposite is constructed to connect to inflexible double-stranded areas. Collectively, they’ll tightly bind to areas the place these two areas meet, enabling a brand new means of learning and manipulating RNA.
Consultants examined these molecules on various kinds of RNA, resembling hairpin-shaped RNA, which kinds a loop-like construction, precursor microRNAs, the immature types of microRNAs earlier than they change into energetic, and messenger RNA, a molecule that carries genetic directions for making proteins. The experiments demonstrated their versatility. For example, they confirmed {that a} particular dual-affinity peptide nucleic acid may block the exercise of the Dicer enzyme, which cuts precursor microRNAs into their mature kinds. This functionality may open the door to regulating microRNA ranges in cells. In one other experiment, these molecules elevated the effectivity of a course of referred to as ribosomal frameshifting, a mechanism some viruses, together with SARS-CoV-2 and HIV-1, use to shift the genetic studying body to provide important proteins. By focusing on structured areas in messenger RNA, the researchers highlighted the potential purposes of this modern expertise.
Dr. Chen defined, “By combining two sorts of artificial molecules, we now have achieved a brand new degree of precision and programmability in focusing on RNA constructions.” He emphasised how this platform may result in new instruments for treating illnesses or investigating RNA intimately.
Remarkably, the research additionally explored how these molecules may goal RNA constructions linked to sure illnesses. For instance, neurodegenerative problems typically outcome from defective RNA splicing, the place items of RNA are incorrectly joined collectively. These dual-affinity peptide nucleic acids may probably right such errors by specializing in particular structural areas, performing like molecular instruments that repair or probe vital RNA conformations.
Developments in RNA-targeted therapies and analysis have gained momentum lately. This research represents a major step ahead, providing extra correct and adaptable instruments for working with RNA. These findings pave the way in which for purposes in illness therapy and scientific exploration, with promising potential for the long run.
Journal Reference
Lu, R., Deng, L., Lian, Y., et al. “Recognition of RNA secondary constructions with a programmable peptide nucleic acid-based platform.” Cell Experiences Bodily Science, 2024, 5, 102150. DOI: https://doi.org/10.1016/j.xcrp.2024.102150
Concerning the Writer
Dr Gang CHEN is an Affiliate Professor within the Faculty of MEDICINE, The Chinese language College of Hong Kong, Shenzhen (https://med.cuhk.edu.cn/en/instructor/164). He acquired his B.S. diploma in Chemistry on the College of Science and Know-how of China (USTC) in 2001. He did his Ph.D. research with Prof. Douglas TURNER within the Division of Chemistry on the College of Rochester. His Ph.D. work concerned thermodynamic and NMR research of RNA inner loops. A greater understanding of the sequence dependence of thermodynamics for RNA constructions will enhance the accuracy of the RNA secondary construction prediction packages resembling MFOLD and RNAstructure. He earned his Ph.D. in 2005. He was a postdoctoral fellow in Prof. Ignacio TINOCO’s lab within the Division of Chemistry on the College of California, Berkeley from January 2006 to June 2009. His analysis in TINOCO lab was on single-molecule mechanical unfolding and folding of RNA pseudoknots by laser optical tweezers, which offered new insights into ribosomal reading-frame regulation by cis-acting mRNA constructions. He was a Analysis Affiliate in Prof. David MILLAR’s lab within the Division of Molecular Biology at The Scripps Analysis Institute engaged on HIV-1 Rev-RRE meeting utilizing single-molecule fluorescence methods. In July 2010, he joined the school within the Division of Chemistry and Organic Chemistry at Nanyang Technological College in Singapore. He joined CUHK-Shenzhen in 2020.
