Cervus sichuanicus is a species of sika deer （Cervus nippon Group）. To date, research has mainly focused on quantity surveying and behavior studies, with genetic information on this species currently deficient. To p...Cervus sichuanicus is a species of sika deer （Cervus nippon Group）. To date, research has mainly focused on quantity surveying and behavior studies, with genetic information on this species currently deficient. To provide scientific evidence to assist in the protection of this species, we collected Sichuan sika deer fecal samples from the Sichuan Tiebu Nature Reserve （TNR） and extracted DNA from those samples. Microsatellite loci of bovine were used for PCR amplification. After GeneScan, the genotype data were used to analyze the genetic diversity and population structure of the Sichuan sika deer in TNR. Results showed that the average expected heterozygosity of the Sichuan sika deer population in TNR was 0.562, equivalent to the average expected heterozygosity of endangered animals, such as Procapra przewalsldi. Furthermore, 8 of 9 microsatellite loci significantly deviated from the Hardy-Weinberg equilibrium and two groups existed within the Sichuan sika deer TNR population. This genetic structure may be caused by a group of Manchurian sika deer （Cervus hortulorum） released in TNR.展开更多
In quorum sensing （QS） process, bacteria regulate gene expression by utilizing small signaling molecules called autoinducers in response to a variety of environmental cues. Autoinducer 2 （AI-2）, a QS signaling mol...In quorum sensing （QS） process, bacteria regulate gene expression by utilizing small signaling molecules called autoinducers in response to a variety of environmental cues. Autoinducer 2 （AI-2）, a QS signaling molecule proposed to be involved in interspecies communication, is produced by many species of gram-negative and gram-positive bacteria. In Escherichia coil and Salmonella typhimurium, the extracellular AI-2 is imported into the cell by a transporter encoded by the lsr operon. Upstream of the lsr operon, there is a divergently transcribed gene encoding LsrR, which was reported previously to repress the transcription of the lsr operon and itself. Here, we have demonstrated for the first time that LsrR represses the transcription of the lsr operon and itself by directly binding to their promoters using gel shift and DNase I footprinting assays. The β-galactosidase reporter assays further suggest that two motifs in both the lsrR and lsrA promoter regions are crucial for the LsrR binding. Furthermore, in agreement with the conclusion that phosphorylated AI-2 can relieve the repression of LsrR in previous studies, our data show that phospho- AI-2 renders LsrR unable to bind to its own promoter in vitro.展开更多
Colorectal cancer is the second most common malignant tumor in China.The FOLFOXIRI regimen,which combines 5-fluorouracil/leucovorin,oxaliplatin,and irinotecan,is a high-intensity and highly effective chemotherapy regi...Colorectal cancer is the second most common malignant tumor in China.The FOLFOXIRI regimen,which combines 5-fluorouracil/leucovorin,oxaliplatin,and irinotecan,is a high-intensity and highly effective chemotherapy regimen.However,the original regimen is poorly tolerated in Chinese patients.In order to promote the standardization and rational application of FOLFOXIRI regimen by clinicians in China,the“Chinese Expert Consensus on the Clinical Application of the Chinese Modified Triplet Combination with Irinotecan(CPT-11),Oxaliplatin(LOHP),Continuous Infusion 5-Fluorouracil,and Leucovorin for Colorectal Cancer”was formulated by the Committee of Colorectal Cancer in Chinese Southwest Oncology Group.Based on the mechanism underlying the combined three drugs and toxicity profile,the dosage of Chinese modified FOLFOXIRI(cmFOLFOXIRI)regimen and the management of adverse reactions are proposed.This consensus recommended that the FOLFOXIRI regimen be used in neoadjuvant,conversion,and palliative therapy for colorectal cancer under specific conditions.This consensus aimed to drive the application of cmFOLFOXIRI in the field of colorectal cancer in order to bring benefits to colorectal cancer patients.展开更多
基金supported by the National Natural Science Foundation of China(30870308 and 31071944)the Shanghai Rising-Star Program(10QA1402200)
文摘Cervus sichuanicus is a species of sika deer （Cervus nippon Group）. To date, research has mainly focused on quantity surveying and behavior studies, with genetic information on this species currently deficient. To provide scientific evidence to assist in the protection of this species, we collected Sichuan sika deer fecal samples from the Sichuan Tiebu Nature Reserve （TNR） and extracted DNA from those samples. Microsatellite loci of bovine were used for PCR amplification. After GeneScan, the genotype data were used to analyze the genetic diversity and population structure of the Sichuan sika deer in TNR. Results showed that the average expected heterozygosity of the Sichuan sika deer population in TNR was 0.562, equivalent to the average expected heterozygosity of endangered animals, such as Procapra przewalsldi. Furthermore, 8 of 9 microsatellite loci significantly deviated from the Hardy-Weinberg equilibrium and two groups existed within the Sichuan sika deer TNR population. This genetic structure may be caused by a group of Manchurian sika deer （Cervus hortulorum） released in TNR.
基金We thank our colleagues J Zang and X Liu for their technical assistance in protein purification. This work was supported by the One Hundred Talent Project of the Chinese Academy of Sciences and the National Natural Science Foundation of China （50738006）.
文摘In quorum sensing （QS） process, bacteria regulate gene expression by utilizing small signaling molecules called autoinducers in response to a variety of environmental cues. Autoinducer 2 （AI-2）, a QS signaling molecule proposed to be involved in interspecies communication, is produced by many species of gram-negative and gram-positive bacteria. In Escherichia coil and Salmonella typhimurium, the extracellular AI-2 is imported into the cell by a transporter encoded by the lsr operon. Upstream of the lsr operon, there is a divergently transcribed gene encoding LsrR, which was reported previously to repress the transcription of the lsr operon and itself. Here, we have demonstrated for the first time that LsrR represses the transcription of the lsr operon and itself by directly binding to their promoters using gel shift and DNase I footprinting assays. The β-galactosidase reporter assays further suggest that two motifs in both the lsrR and lsrA promoter regions are crucial for the LsrR binding. Furthermore, in agreement with the conclusion that phosphorylated AI-2 can relieve the repression of LsrR in previous studies, our data show that phospho- AI-2 renders LsrR unable to bind to its own promoter in vitro.
基金supported by The National Key Research and Development Plan of China[2019YFC1316003].
文摘Colorectal cancer is the second most common malignant tumor in China.The FOLFOXIRI regimen,which combines 5-fluorouracil/leucovorin,oxaliplatin,and irinotecan,is a high-intensity and highly effective chemotherapy regimen.However,the original regimen is poorly tolerated in Chinese patients.In order to promote the standardization and rational application of FOLFOXIRI regimen by clinicians in China,the“Chinese Expert Consensus on the Clinical Application of the Chinese Modified Triplet Combination with Irinotecan(CPT-11),Oxaliplatin(LOHP),Continuous Infusion 5-Fluorouracil,and Leucovorin for Colorectal Cancer”was formulated by the Committee of Colorectal Cancer in Chinese Southwest Oncology Group.Based on the mechanism underlying the combined three drugs and toxicity profile,the dosage of Chinese modified FOLFOXIRI(cmFOLFOXIRI)regimen and the management of adverse reactions are proposed.This consensus recommended that the FOLFOXIRI regimen be used in neoadjuvant,conversion,and palliative therapy for colorectal cancer under specific conditions.This consensus aimed to drive the application of cmFOLFOXIRI in the field of colorectal cancer in order to bring benefits to colorectal cancer patients.
