Yanli Du

With the intensification of social aging and the improvement of living standards, delaying aging has become a focus of common concern, especially in regard to skin aging. Although collagen peptides have been widely reported as therapeutic agents in relieving skin aging, the molecular mechanisms remain inadequately elucidated. This review emphasizes that the alleviation of skin aging by collagen peptides is a systematic and complex process, including the removal of reactive oxygen species, inhibition of inflammation, inhibition of extracellular matrix (ECM) degradation and melanin deposition, activation of lysosomal and mitochondrial function, and promotion of ECM synthesis. It also highlights that lysosomes and mitochondria may be the key organelles that regulate collagen peptides to alleviate skin aging. Current research on the mechanism of collagen peptides in alleviating skin aging still requires bold breakthroughs and should not be confined to the transforming growth factor (TGF-β)/Smad, mitogen-activated protein kinase, and nuclear factor kappa-B pathways. In addition, many natural antioxidant components have been proven to alleviate skin aging by regulating organelle function. Therefore, the regulatory effects of collagen peptides with antioxidant activity on mitochondrial and lysosome functions in aging skin need more attention and exploration, which is of great significance for further research on precise skin care and targeted anti-skin aging therapy.

The aadA1 gene, which confers resistance to streptomycin, is typically located within class Ⅰ integrons. This genetic context enables its dissemination among diverse Gram-negative bacteria, such as Salmonella, and facilitates its potential transfer to humans through the food chain or into agricultural environments via manure. Hence, the detection of aadA1 genes is crucial for surveillance, understanding transmission dynamics, and informing strategies to mitigate the spread of resistant bacteria. Conventional aadA1 detection relies on time-consuming or equipment-intensive molecular assays like PCR or qPCR. In this study, we developed and optimized a closed-tube, hydroxynaphthol blue (HNB) -based loop-mediated isothermal amplification (LAMP) assay to detect Salmonella aadA1 gene and performed evaluation and validation against conventional PCR. The LAMP assay demonstrated high specificity and sensitivity, with a detection limit of 1 pg (190 copies) of genomic DNA per reaction, which is tenfold higher than that of conventional PCR. In parallel testing of 40 Salmonella DNA samples, the optimized LAMP assay achieved a detection rate of 100.0% for the aadA1 gene in streptomycin-resistant isolates, compared to 96.3% by conventional PCR. Among the streptomycin-susceptible isolates, the LAMP assay also showed a higher detection rate (38.5%) for the aadA1 gene, compared to 23.1% by conventional PCR. Consequently, the LAMP assay developed in this study for detecting the aadA1 gene offers a combination of simplicity, speed, visual readout, high specificity, and sensitivity, making it particularly suitable for rapid field detection in antimicrobial resistance surveillance programs.

Objective: The development of pre-hierarchical follicles (PHFs), especially small yellow follicles (SYFs), directly affects the recruitment of dominant follicles and subsequently affects the egg-laying performance of chickens. The development of PHFs, especially SYFs, and their regulatory mechanisms remain unclear.Methods: Transcriptomic and metabolomic analyses were conducted on large white follicles (LWFs) and SYFs in chickens.Results: Transcriptome sequencing revealed 258 differentially expressed genes (DEGs) between SYFs and LWFs, with 172 genes upregulated and 86 downregulated. The DEGs were mapped to 17 Kyoto encyclopedia of genes and genomes (KEGG) pathways, including glutathione metabolism, ferroptosis, calcium signaling pathway, and neuroactive ligand– receptor interactions, among others. The metabolome analysis revealed 129 significant differential metabolites (DMs), comprising 36 upregulated and 93 downregulated metabolites. The DMs were associated with nine KEGG pathways, including glutathione metabolism, alpha-linolenic acid metabolism, and linoleic acid metabolism, etc. The combined transcriptional and metabolic analysis revealed significantly enriched pathways. Five KEGG pathways associated with follicular development were identified, including glutathione metabolism, ferroptosis, alpha-linolenic acid metabolism, linoleic acid metabolism, and pyrimidine metabolism.Conclusion: Glutathione metabolism may directly inhibit Ferroptosis, which can induce apoptosis of granulosa cells, thereby regulating SYFs development in chickens. These findings could serve as a reference for improving the egg-laying performance of Tengchong snow chickens.

The development of pre-hierarchical follicle (PHF), especially small yellow follicles (SYFs), directly affects the recruitment of dominant follicles and thus affects the egg-laying performance of chickens. However, the development of PHF, especially the development of SYF, and its regulatory mechanism remain unclear. Therefore, we performed transcriptomic and metabolomic analyses of large white follicles (LWFs) and SYFs in chickens. Transcriptome sequencing revealed 258 differentially expressed genes (DEGs) between SYF and LWF, of which 172 were upregulated and 86 were downregulated. The DEGs were mapped to 17 KEGG pathways, mainly the gap junction, calcium signaling, and neuroactive ligand-receptor interaction pathways. The results of the metabolome analysis revealed 129 significant differential metabolites (DMs), including 36 upregulated DMs and 93 downregulated DMs. The DMs were mapped to 9 KEGG pathways for follicle tissue, which included mainly glutathione metabolism, alpha-linolenic acid metabolism, and tryptophan metabolism, etc. The combined transcriptional and metabolic analysis revealed significantly enriched pathways, and four metabolically related pathways, including glutathione metabolism, alpha-linolenic acid metabolism, linoleic acid metabolism, and pyrimidine metabolism, were identified. Glutathione metabolism is a critical signaling pathway that may affect ovarian follicle development to regulate the SYF reserve process in chickens. These results can act as a reference for improving the egg-laying performance of Tengchong snow chickens.

Broodiness in egg-laying hens (EHs) leads to ovarian atrophy, resulting in reduced egg-laying performance. However, the ovarian regulatory mechanisms in broody hens (BCs) remain elusive. Therefore, ovaries were removed from 300-day-old BCs and EHs for RNA sequencing. Ovarian morphology and histological characteristics of the BC and EH groups were compared and analyzed. The EH group had significantly more hierarchical follicles (HFs) and small yellow follicles (SYFs) than that of the BC group. Although several secondary follicles (SFs) and primary follicles were observed in the ovaries of the EH group, only a few SFs were observed in the ovaries of the BC group. Subsequently, RNA-sequencing analysis was conducted to determine the ovarian expression profiles of the two groups. Transcriptome sequencing identified 259 differentially expressed genes (DEGs) between the BC and EH groups. Of the 259 DEGs, 136 were upregulated and 123 were downregulated. The DEGs were mapped to 22 gene ontology terms and 4 Kyoto Encyclopedia of Genes and Genomes pathways for ovarian tissue. The analysis showed that matrix metalloproteinases 11/13 (MMP11/MMP13) were enriched in the extracellular matrix. The extracellular matrix mediated by MMP13 is affected by follicle-stimulating hormone, prolactin, and estrogen, which are critical signaling pathways that may affect ovarian follicle development to regulate the large yellow follicle reserve process and the ovulation cycle of broody Chahua chickens. These findings indicate that understanding differences in gene expression between the ovarian tissues of BCs and EHs could serve as a valuable reference point for enhancing egg-laying performance in Chahua chickens.

Calmodulin-like proteins (CML) are important calcium signal transduction proteins in plants. CML genes have been analyzed in several plants. However, little information on CML in Phaseolus vulgare is available. In this study, we identified 111 PvCMLs distributed on eleven chromosomes. Phylogenetic analysis classified them into seven subfamilies. Cis-acting element prediction showed that PvCML contained elements related to growth and development, response to abiotic stress and hormones. Moreover, the majority of PvCMLs showed different expression patterns in most of the nine tissues and developmental stages which indicated the role of PvCML in the growth and development of common bean. Additionally, the common bean was treated with melatonin by seed soaking, and root transcriptome at the 5th day and qRT-PCR of different tissue at several stages were performed to reveal the response of PvCML to the hormone. Interestingly, 9 PvCML genes of subfamily VI were detected responsive to exogenous melatonin, and the expression dynamics of nine melatonin response PvCML genes after seed soaking with melatonin were revealed. Finally, the protein interaction network analysis of nine melatonin responsive PvCMLs was constructed. The systematic analysis of the PvCML gene family provides theoretical support for the further elucidation of their functions, and melatonin response molecular mechanism of the CML family in P. vulgaris.

Improvement of soybean [Glycine max (L.) Merr.] yield and photosynthesis physiology have been achieved over decades of cultivar breeding. Identification of the mechanisms involved in shoot-root interactions would be beneficial for the development of yield improvement breeding strategies. The objectives of this study were to investigate soybean shoot-root interactions with different-year released soybean cultivars and to evaluate their effects on grain yield and yield components. Soybean grafts used in this study were constructed with two record-yield cultivars Liaodou14 (L14) and Zhonghuang35 (Z35) and eleven cultivars released in 1966–2006 from the United States and Chinese. The grafting experiments were conducted as pot-culture experiments and repeated in 2014 and 2015. Our results showed that net photosynthesis rate (P_N) was positively correlated to both root activity and root bleeding sap mass (RBSM) during the R6 reproductive stage. Moreover, different year-released soybean shoots had all exhibited capabilities of changing the root activity and architecture of L14 and Z35 rootstocks to “generation”-specific patterns during all reproductive stages. However, these influences were independent of the photosynthetic strength. Yield analysis had demonstrated that high-yielding root systems (L14 and Z35 rootstocks) could cause more than 15% of yield increase in seven out of eleven common scions in a scion-genotype-dependent manner. For Williams-descendant cultivar scions, L14 and Z35 rootstocks promoted yields mainly by increasing the seed number (SN), but those scions of Amsoy-descendent cultivars showed mainly seed weight (SW) increases when grafted onto L14 and Z35 rootstocks. On the other hand, although most tested common rootstocks did not show significant influence over the final yields in record-yield L14 and Z35 scions, they were obviously capable of shifting the formation of yield components when compared to L14 and Z35 self-grafting controls. Taken together, soybean shoots could influence the root physiology and played a crucial role in the determination of yield potentials. Synergistically with shoots, soybean roots played a more supportive role during the realization of yield potentials through root activities and by balancing the formation of yield components. These findings provided interesting insightful information for developing new breeding strategies which aim to pyramid elite physiological and yield traits by selecting specific parental combinations.

A novel Gram-staining-negative, aerobic, non-motile by gliding and rod-shaped strain designated 22T was isolated from surface-sterilized root tissue of maize planted in the Fangshan District of Beijing, People's Republic of China. The highest levels of 16S rRNA gene sequence similarity were found with respect to Pedobacter suwonensis15-52T (97.5 %), Pedobacter terrae DS-57T (97.1 %) and Pedobacter alluvionis NWER-II11T (97.0 %). Phylogenetic analysis based on 16S rRNA gene sequence data indicated that strain 22T is a member of the genus Pedobacter. The isolate exhibited relatively low levels of DNA-DNA relatedness with respect to P. suwonensis DSM 18130T (21.3±2.0%), P. alluvionis DSM 19624T (38.1±1.8% ) and P. terrae DSM 17933T (17.1±1.4%). The DNA G+C content was 41.2 ±0.5 mol%. The major isoprenoid quinone was menaquinone-7 (MK-7). The major component in the polyamine pattern was sym-homospermidine. The major polar lipids consisted of phosphatidylethanolamine, three unidentified aminolipids and one unidentified lipid. The major fatty acids were identified as iso-C15 : 0 and summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c). The results of the physiological and biochemical tests and minor differences in the fatty acid profiles allowed a clear phenotypic differentiation of strain 22T from the related species with high level 16S rRNA gene sequence similarity P. suwonensis DSM 18130T, P. alluvionis DSM 19624T and P. terrae DSM 17933T. Strain 22T represents a novel species within the genus Pedobacter, for which the name Pedobacter zeae sp. nov. is proposed, with the type strain 22T (= CGMCC 1.15287 = DSM 100774).