One of the biggest surprises at the beginning of the 'post-genome era' was the discovery of numerous genes encoding microRNAs. They were found in genomes of such diverse organisms as Caenorhabditis elegans, Drosophila melanogaster, Arabidopsis thaliana, and Homo sapiens which implies their important role in multicellular life evolution. The number of microRNA genes is estimated to be nearly 1% of that of protein-coding genes. Their products, tiny RNAs, are thought to regulate gene expression during development, organogenesis, and very likely during many other processes, by hybridizing to their target mRNAs. The cellular functions of mRNAs that are regulated by microRNAs are only beginning to be revealed, and details of this regulation mechanism are still poorly understood. In this article we discuss the possible mechanisms of microRNA biogenesis with special emphasis on their structural aspects. We have focused on the factors and effects that may be responsible for the existing length differences between different microRNAs, and for the observed length heterogeneity within some individual microRNA species.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1080/15216540410001670142 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
[Global surgery-Challenges in the treatment of children with cleft lip and palate].
Chirurgie (Heidelb)
January 2025
Klinik für Mund‑, Kiefer- und Plastische Gesichtschirurgie, Zentrum für Zentrum für Lippen-Kiefer-Gaumenspalten und seltene oro-kranio-faziale Fehlbildungen, Universitätsmedizin Frankfurt, Theodor-Stern-Kai 7, 60590, Frankfurt am Main, Deutschland.
Background: Cleft lip and palate is the most frequent malformation in humans that requires surgical correction but is not primarily life-threatening. That is why in many economically not very well developed countries, special surgical care, such as for cleft lip and palate, is not guaranteed at all or is not sufficiently guaranteed, so that numerous aid organizations have been founded for over 50 years to provide help by organizing surgical aid missions. Even if this help seems primarily ethically harmless and very laudable, the lack of rules and instructions unfortunately regularly leads to the fact that legal, ethical and even medical treatment standards are often not observed to the detriment of the affected children.
View Article and Find Full Text PDF"Form follows function": the developmental morphology of the cardiac atria.
Physiol Res
December 2024
Children's Heart Center, Second Faculty of Medicine, Charles University and Motol University Hospital, Praha, Czech Republic.
Although the heart atria have a lesser functional importance than the ventricles, atria play an important role in the pathophysiology of heart failure and supraventricular arrhythmias, particularly atrial fibrillation. In addition, knowledge of atrial morphology recently became more relevant as cardiac electrophysiology and interventional procedures in the atria gained an increasingly significant role in the clinical management of patients with heart disease. The atrial chambers are thin-walled, and several vessels enter at the level of the atria.
View Article and Find Full Text PDFThe synthesis and structural aspects of the perbromo-functionalised thiaboranes -SBBr ( = 5, 9, 11): the solid-state structure of the octahedral -SBBr, governed by strong dihalogen contacts.
Chem Commun (Camb)
January 2025
Institute of Inorganic Chemistry, Czech Academy of Sciences, 250 68 Husinec-Řež, Czech Republic.
Co-pyrolysis reactions of BBr with SBr at 350 °C yielded the brominated thiaboranes -SBBr (1), -1-SBBr (2) and -SBBr (3), confirmed by high-resolution mass spectrometry, experimental and computational B NMR spectroscopy. The strong Br(σ-hole)⋯Br(ring) attraction has been the decisive energy contribution in the crystal of 1.
View Article and Find Full Text PDFThe endothelium at the interface between tissues and in the bloodstream.
Clin Microbiol Rev
January 2025
Laboratory of Pathology of Implant Infections, Laboratory of Immunorheumatology and Tissue Regeneration, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy.
SUMMARY is a major human pathogen. It can cause many types of infections, in particular bacteremia, which frequently leads to infective endocarditis, osteomyelitis, sepsis, and other debilitating diseases. The development of secondary infections is based on the bacterium's ability to associate with endothelial cells lining blood vessels.
View Article and Find Full Text PDFWhy Does an "Avatar Nose" Appear After Dermal Filler Injection? Insights From a Cadaveric Study on the Nasofrontal Ligament.
Dermatol Surg
January 2025
Division in Anatomy and Developmental Biology, Department of Oral Biology, Human Identification Research Institute, BK21 FOUR Project, Yonsei University College of Dentistry, Seodaemun-gu, Seoul, Korea.
Background: Nonsurgical rhinoplasty (NSR) with dermal fillers has gained popularity because of its immediate and visible results, minimal downtime, and long-lasting effects. However, complications such as filler migration can lead to the development of the "Avatar nose," a condition where the nose appears unnaturally wide and bulbous in the nasion area, disrupting facial harmony. This phenomenon is often exacerbated by the presence of a taut nasofrontal ligament, which tethers the periosteum to the dermal layer and influences nasal contour.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!