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G-quadruplex-forming small RNA inhibits coronavirus and influenza A virus replication.
Commun Biol
January 2025
Division of Microbiology, Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1, Komatsuhima, Aoba-ku, Sendai, Miyagi, 981-8558, Japan.
Future pandemic threats may be caused by novel coronaviruses and influenza A viruses. Here we show that when directly added to a cell culture, 12mer guanine RNA (G12) and its phosphorothioate-linked derivatives (G12(S)), rapidly entered cytoplasm and suppressed the propagation of human coronaviruses and influenza A viruses to between 1/100 and nearly 1/1000 of normal virus infectivity without cellular toxicity and induction of innate immunity. Moreover, G12(S) alleviated the weight loss caused by coronavirus infection in mice.
View Article and Find Full Text PDFFat droplets in the cerebrospinal fluid (CSF) spaces of the brain.
AIMS Neurosci
November 2024
Clinical Sciences, California Northstate University College of Medicine, Elk Grove, CA, USA.
It is rare to find free floating fat droplets in the cerebral spinal fluid (CSF) spaces of the brain. When fat droplets are seen in the CSF spaces, the most common cause is the rupture of a dermoid cyst. Dermoid cysts are congenital inclusion cysts that form during the neural tube closure between the third and fifth weeks of embryogenesis.
View Article and Find Full Text PDFPrebiotic RNA self-assembling and the origin of life: Mechanistic and molecular modeling rationale for explaining the prebiotic origin and replication of RNA.
Acta Histochem
January 2025
School of Chemistry, University of Glasgow, Glasgow G12 8QQ, UK.
In recent years, a great interest has been focused on the prebiotic origin of nucleic acids and life on Earth. An attractive idea is that life was initially based on an autocatalytic and autoreplicative RNA (the RNA-world). RNA duplexes are right-handed helical chains with antiparallel orientation, but the rationale for these features is not yet known.
View Article and Find Full Text PDFThermodynamics of nucleosome breathing and positioning.
J Chem Phys
January 2025
Department of Physics and Astronomy and Center for Quantitative Biology, Rutgers University, Piscataway, New Jersey 08854, USA.
Nucleosomes are fundamental units of chromatin in which a length of genomic DNA is wrapped around a histone octamer spool in a left-handed superhelix. Large-scale nucleosome maps show a wide distribution of DNA wrapping lengths, which in some cases are tens of base pairs (bp) shorter than the 147 bp canonical wrapping length observed in nucleosome crystal structures. Here, we develop a thermodynamic model that assumes a constant free energy cost of unwrapping a nucleosomal bp.
View Article and Find Full Text PDFMicrostructural Degeneration of the Corpus Callosum in Parkinson's Disease with Unilateral Onset: A Free-Water Imaging Study.
ACS Chem Neurosci
January 2025
Department of Radiology, The Second Affiliated Hospital, Zhejiang University of Medicine, Hangzhou 310009, China.
Article Synopsis
- Motor symptom laterality in Parkinson's Disease (PD) impacts both motor and nonmotor symptoms, potentially altering patient prognosis, with compensatory mechanisms in the brain's dominant hemisphere playing a key role.
- This study investigated the microstructural changes in the corpus callosum (CC), the brain's main connector between hemispheres, in 201 right-handed PD patients (split between left- and right-onset) compared to 100 healthy controls using advanced imaging techniques.
- Findings revealed reduced free water and fractional anisotropy, along with increased mean diffusivity in the CC of patients with left-side PD onset, highlighting the relationship between brain structure and disease symptoms.
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