Complete chloroplast genome of Lamiophlomis rotata: comparative genome analysis and phylogenetic analysis.

Lamiophlomis rotata, the only species within the genus Lamiophlomis (family Labiatae), exhibits a broad geographical distribution in elevated highland areas in Qinghai-Tibetan Plateau and possesses significant therapeutic properties. Numerous chemical compositions and putative phylogenetic affiliations of this species have been documented in prior research. Nevertheless, there is a scarcity of accessible publications regarding the genomic data of L. rotata, particularly its chloroplast genome. This dearth of knowledge hampers the comprehensive investigation of its phylogenetic placement within the Labiatae family. In this study, we present a comprehensive analysis of the plastid genome of L. rotata. The plastid genome has a length of 151,837 base pairs (bp) and a GC content of 38.5%. Within this genome, a total of 135 genes were identified, including 90 protein-coding genes, 37 transfer RNA (tRNA) genes, and eight ribosomal RNA (rRNA) genes. By employing phylogenetic analysis, the taxonomic position of L. rotata within the family Labiatae is elucidated, highlighting a close relationship between the genus Lamiophlomis and the genus Phlomis. Notably, extensive genetic variations were uncovered between L. rotata and other Phlomis species. This study could provide significant insights for understanding the phylogenetic relationships of taxa within Labiatae.

Intergeneric Relationships within the Family Salicaceae s.l. based on Plastid Phylogenomics.

Many Salicaceae s.l. plants are recognized for their important role in the production of products such as wood, oils, and medicines, and as a model organism in life studies. However, the difference in plastid sequence, phylogenetic relationships, and lineage diversification of the family Salicaceae s.l. remain poorly understood. In this study, we compare 24 species representing 18 genera of the family. Simple sequence repeats (SSRs) are considered effective molecular markers for plant species identification and population genetics. Among them, a total of 1798 SSRs were identified, among which mononucleotide repeat was the most common with 1455 accounts representing 80.92% of the total. Most of the SSRs are located in the non-coding region. We also identified five other types of repeats, including 1750 tandems, 434 forward, 407 palindromic, 86 reverse, and 30 complementary repeats. The species in Salicaceae s.l. have a conserved plastid genome. Each plastome presented a typical quadripartite structure and varied in size due to the expansion and contraction of the inverted repeat (IR) boundary, lacking major structural variations, but we identified six divergence hotspot regions. We obtained phylogenetic relationships of 18 genera in Salicaceae s.l. and the 24 species formed a highly supported lineage. Casearia was identified as the basal clade. The divergence time between Salicaceae s.l. and the outgroup was estimated as ~93 Mya; Salix, and Populus diverged around 34 Mya, consistent with the previously reported time. Our research will contribute to a better understanding of the phylogenetic relationships among the members of the Salicaceae s.l.

An Up-regulation of IRF-1 After a Spinal Cord Injury: Implications for Neuronal Apoptosis.

IRF-1, a kind of transcription factor, is expressed in many cell types, except in early embryonal cells. IRF-1 has played an essential role in various physiological and pathological processes, including tumor immune surveillance, viral infection, development of immunity system and pro-inflammatory injury. However, the expression and function of IRF-1 in spinal cord injury (SCI) are still unknown. In this study, we have performed an acute SCI model in adult rats and investigated the dynamic changes of IRF-1 expression in the spinal cord. Western blot have shown that IRF-1 protein levels gradually increased, reaching a peak at day 3 and then gradually declined to a normal level at day 14 after SCI. Double immunofluorescence staining showed that IRF-1 immunoreactivity was found in neurons, but not in astrocytes and microglia. Additionally, colocalization of IRF-1/active caspase-3 was detected in neurons. In vitro, IRF-1 depletion, by short interfering RNA, obviously decreases neuronal apoptosis. In conclusion, this is the first description of IRF-1 expression in spinal cord injury. Our results suggested that IRF-1 might play crucial roles in CNS pathophysiology after SCI.

An efficient and chemoselective procedure for acylal synthesis.

A novel heterogeneous efficient procedure has been developed for the chemoselective synthesis of acylals (1,1-diacetates) under solvent-free conditions. A novel catalyst prepared by the sulfuric acid catalyzed copolymerization of p-toluenesulfonic acid and paraformaldehyde displays extremely high activities for the title reactions, affording average yields over 90% within several minutes. A comparative study showed that the novel catalyst has much higher activity than other catalysts used for this purpose. Besides, the novel catalyst displays chemoselectivity for the protection of aldehydes in the presence of ketones. In addition the high acidity (4.0 mmol/g), thermal stability (200 ºC) and easy reusability make the novel catalyst one of the best choices for the process.