1. Predicting the effects of rising temperature entails measuring both habitat thermal characteristics and the physiological variation of the species as it relates to this microhabitat variation; these two types of measurements can generate what
The Manila clam Ruditapes philippinarum is the world’s second most important bivalve mollusk commercially farmed, whose indigenous populations are mainly distributed in the coastal areas of East Asia. However, with the development of commercialization, mixture of populations and loss of local germplasm have become prominent problems. Here, genetic differentiation of seven Manila clam populations from East Asia was investigated through analyzing the polymorphism of the mitochondrial cytochrome C oxidase subunit I (COI) gene as well as 20 simple sequence repeat (SSR) molecular loci. In total, 40 haplotypes were identified, among which 31 were unique. Moreover, two main haplotypes were detected with several radiating derived haplotypes. Populations in Japan-North Korea shared haplotype Hap_31, and populations in China shared haplotype Hap_7, suggesting that the natural geographical isolation of the Yangtze River and the Yalu River might have divided the East Asian indigenous populations into three groups, which were located in South China, North China, and Japan-North Korea, respectively. The Aquaculture breeding activities from South to North in China might have promoted gene exchange among Manila clam populations. Population in Laizhou had the highest genetic diversity and therefore could be an excellent germplasm source.
Background: The aim of this study was to determine the effects of matrine (a natural alkaloid) on sorafenib-induced cytotoxicty against hepatocellular carcinoma (HCC) cells, and to explore the molecular mechanisms involved. Methods: HepG2 and Hep3B cells were treated with matrine alone or in combination with sorafenib, and cell viability and apoptosis were assessed. The involvement of micro (mi)RNA-21 in the action of matrine was examined. Results: Matrine significantly augmented the antiproliferative activity of sorafenib in a dose-dependent manner. Matrine significantly increased apoptosis, coupled with enhanced cleavage of caspase-3 and poly (ADP-ribose) polymerase. miRNA-21-overexpressing HCC cells showed a marked decrease in matrine-induced growth suppression and the expression of phosphatase and tensin homolog (PTEN). The suppressive effect of combining matrine and sorafenib was significantly reduced by miRNA-21 overexpression or PTEN inhibition. Conclusion: Matrine in combination with sorafenib leads to increased cytotoxic effects against HCC cells, at least partially, via the suppression of miRNA-21 and the subsequent induction of PTEN.
The roles of synonymous mutations for adapting to stressful thermal environments are of fundamental biological and ecological interests but poorly understood. To study whether synonymous mutations influence thermal adaptation at specific microhabitats, a genome-wide genotype-phenotype association analysis is carried out in the black mussels Mytilisepta virgata. A synonymous mutation of Ubiquitin-specific Peptidase 15 (MvUSP15) is significantly associated with the physiological upper thermal limit. The individuals carrying GG genotype (the G-type) at the mutant locus possess significantly lower heat tolerance compared to the individuals carrying GA and AA genotypes (the A-type). When heated to sublethal temperature, the G-type exhibit higher inter-individual variations in MvUSP15 expression, especially for the mussels on the sun-exposed microhabitats. Taken together, a synonymous mutation in MvUSP15 can affect the gene expression profile and interact with microhabitat heterogeneity to influence thermal resistance. This integrative study sheds light on the ecological importance of adaptive synonymous mutations as an underappreciated genetic buffer against heat stress and emphasizes the importance of integrative studies at a microhabitat scale for evaluating and predicting the impacts of climate change.
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