Objective:To surveill emerging variants by nanopore technology-based genome sequencing in different COVID-19 waves in Sri Lanka and to examine the association with the sample characteristics,and vaccination status.Met...Objective:To surveill emerging variants by nanopore technology-based genome sequencing in different COVID-19 waves in Sri Lanka and to examine the association with the sample characteristics,and vaccination status.Methods:The study analyzed 207 RNA positive swab samples received to sequence laboratory during different waves.The N gene cut-off threshold of less than 30 was considered as the major inclusion criteria.Viral RNA was extracted,and elutes were subjected to nanopore sequencing.All the sequencing data were uploaded in the publicly accessible database,GISAID.Results:The Omicron,Delta and Alpha variants accounted for 58%,22%and 4%of the variants throughout the period.Less than 1%were Kappa variant and 16%of the study samples remained unassigned.Omicron variant was circulated among all age groups and in all the provinces.Ct value and variants assigned percentage was 100%in Ct values of 10-15 while only 45%assigned Ct value over 25.Conclusions:The present study examined the emergence,prevalence,and distribution of SARS-CoV-2 variants locally and has shown that nanopore technology-based genome sequencing enables whole genome sequencing in a low resource setting country.展开更多
Oviductus Ranae is the dried oviduct of female Rana tem-poraria chensinensis （David）, distributed mainly in North- eastern China. Oviductus Ranae is one of the best-known and highly valued oriental foods and medicin...Oviductus Ranae is the dried oviduct of female Rana tem-poraria chensinensis （David）, distributed mainly in North- eastern China. Oviductus Ranae is one of the best-known and highly valued oriental foods and medicines. Traditional Chinese medicine holds that Oviductus Ranae can nourish yin, moisten lung and replenish the kidney essence. Meanwhile, activities of Oviductus Ranae such as anti-aging, anti-lipemic, anti-oxidation and anti-fatigue have also been demonstrated by modern phar-macological studies. Previous studies have shown that Oviductus Ranae is mainly composed of proteins, which are up to 50% or more.展开更多
Background: Traditionally,scientists studied microbiology through the manner of batch cultures,to conclude the dynamics or outputs by averaging all individuals.However,as the researches go further,the heterogeneities ...Background: Traditionally,scientists studied microbiology through the manner of batch cultures,to conclude the dynamics or outputs by averaging all individuals.However,as the researches go further,the heterogeneities among the individuals have been proven to be crucial for the population dynamics and fates.Results:Due to the limit of technology,single-cell analysis methods were not widely used to decipher the inherent connections between individual cells and populations.Since the early decades of this century,the rapid development of microfluidics,fluorescent labelling,next-generation sequencing,and high-resolution microscopy have speeded up the development of single-cell technologies and further facilitated the applications of these technologies on bacterial analysis.Conclusions:In this review,we summarized the recent processes of single-cell technologies applied in bacterial analysis in terms of intracellular characteristics,cell physiology dynamics,and group behaviors,and discussed how single-cell technologies could be more applicable for future bacterial researches.展开更多
With high-throughput Solexa sequencing technology,we profiled Porphyra yezoensis transcriptomes from 8 different samples. More than 1200 megabases from 13333334 quality paired-end reads were generated,which were assem...With high-throughput Solexa sequencing technology,we profiled Porphyra yezoensis transcriptomes from 8 different samples. More than 1200 megabases from 13333334 quality paired-end reads were generated,which were assembled into 31538 unigenes. Blast analysis showed that 56.7%unigenes were novel,which represented the specific genes of Porphyra and/or rhodophytes. Several hundreds of unigenes related to stress tolerance were discovered,including genes related to desiccation-(211) and high light-tolerance(31) ,flavonoid biosynthesis(10) ,reactive oxygen scavenging(48) and other stress-tolerance processes(208) ,which indicated there existed complex and diversity modes of stress tolerance in this species.A complete set of essential genes involved in the C3-(57) and C4-(44) carbon fixation pathway(except pyruvate phosphate dikinase) were discovered,which not only proved that they were actively transcribed but also clearly outlined the panoptic view of carbon fixation in Porphyra.Moreover,by statistically analyzing the types,proportions and frequencies of the interspersed repeats(TEs) and simple sequence repeats(SSRs) ,we discovered that the top three types of TEs were all retrotransposons and the trinucleotide was the absolute predominant type among SSRs,promoting our understanding of structural characteristics of the transcriptome.This study substantially improved the global view of the Porphyra genome and provided a valuable resource for future research.展开更多
文摘Objective:To surveill emerging variants by nanopore technology-based genome sequencing in different COVID-19 waves in Sri Lanka and to examine the association with the sample characteristics,and vaccination status.Methods:The study analyzed 207 RNA positive swab samples received to sequence laboratory during different waves.The N gene cut-off threshold of less than 30 was considered as the major inclusion criteria.Viral RNA was extracted,and elutes were subjected to nanopore sequencing.All the sequencing data were uploaded in the publicly accessible database,GISAID.Results:The Omicron,Delta and Alpha variants accounted for 58%,22%and 4%of the variants throughout the period.Less than 1%were Kappa variant and 16%of the study samples remained unassigned.Omicron variant was circulated among all age groups and in all the provinces.Ct value and variants assigned percentage was 100%in Ct values of 10-15 while only 45%assigned Ct value over 25.Conclusions:The present study examined the emergence,prevalence,and distribution of SARS-CoV-2 variants locally and has shown that nanopore technology-based genome sequencing enables whole genome sequencing in a low resource setting country.
基金supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (No. 2011BAI03B00)the National Science and Technology Major Project of the Ministry of Science and Technology of China (No. 2011ZX09401-305)
文摘Oviductus Ranae is the dried oviduct of female Rana tem-poraria chensinensis （David）, distributed mainly in North- eastern China. Oviductus Ranae is one of the best-known and highly valued oriental foods and medicines. Traditional Chinese medicine holds that Oviductus Ranae can nourish yin, moisten lung and replenish the kidney essence. Meanwhile, activities of Oviductus Ranae such as anti-aging, anti-lipemic, anti-oxidation and anti-fatigue have also been demonstrated by modern phar-macological studies. Previous studies have shown that Oviductus Ranae is mainly composed of proteins, which are up to 50% or more.
基金This paper was supported by the National Natural Science Foundation of China(Nos.31770111,31800083 and 31570095)Shenzhen Science Technology and Innovation Commission(Nos.KQTD2016112915000294,JCYJ20170413153329565,JCYJ20170818160418654 and JCYJ2018030-2145817753)+1 种基金Instrumental project from Chinese Academy of Science(No.YJKYYQ20170063)China Postdoctoral Science Foundation Grant(Nos.2017M622832 and 2018M631002).
文摘Background: Traditionally,scientists studied microbiology through the manner of batch cultures,to conclude the dynamics or outputs by averaging all individuals.However,as the researches go further,the heterogeneities among the individuals have been proven to be crucial for the population dynamics and fates.Results:Due to the limit of technology,single-cell analysis methods were not widely used to decipher the inherent connections between individual cells and populations.Since the early decades of this century,the rapid development of microfluidics,fluorescent labelling,next-generation sequencing,and high-resolution microscopy have speeded up the development of single-cell technologies and further facilitated the applications of these technologies on bacterial analysis.Conclusions:In this review,we summarized the recent processes of single-cell technologies applied in bacterial analysis in terms of intracellular characteristics,cell physiology dynamics,and group behaviors,and discussed how single-cell technologies could be more applicable for future bacterial researches.
基金supported by the National Natural Science Foundation of China(30972247,30700621)Special Fund for Agro-scientific Research in the Public Interest(200903030)+2 种基金National High Technology Research and Development Program of China(2006AA10A402,2006AA10A413)Program for New Century Excellent Talents in University(NCET-06-0596)Promotive Research Fund for Young and Middle-aged Scientisits of Shandong Province(2008BS06002)
文摘With high-throughput Solexa sequencing technology,we profiled Porphyra yezoensis transcriptomes from 8 different samples. More than 1200 megabases from 13333334 quality paired-end reads were generated,which were assembled into 31538 unigenes. Blast analysis showed that 56.7%unigenes were novel,which represented the specific genes of Porphyra and/or rhodophytes. Several hundreds of unigenes related to stress tolerance were discovered,including genes related to desiccation-(211) and high light-tolerance(31) ,flavonoid biosynthesis(10) ,reactive oxygen scavenging(48) and other stress-tolerance processes(208) ,which indicated there existed complex and diversity modes of stress tolerance in this species.A complete set of essential genes involved in the C3-(57) and C4-(44) carbon fixation pathway(except pyruvate phosphate dikinase) were discovered,which not only proved that they were actively transcribed but also clearly outlined the panoptic view of carbon fixation in Porphyra.Moreover,by statistically analyzing the types,proportions and frequencies of the interspersed repeats(TEs) and simple sequence repeats(SSRs) ,we discovered that the top three types of TEs were all retrotransposons and the trinucleotide was the absolute predominant type among SSRs,promoting our understanding of structural characteristics of the transcriptome.This study substantially improved the global view of the Porphyra genome and provided a valuable resource for future research.
