Data mining of simple sequence repeats in transcriptome sequences of Tibetan medicinal plant Zangyinchen Swertia mussotii / 中国中药杂志

MISA (MicroSAtelite) software was employed to screen SSRs in 68 787 contigs of Swertia mussotii transcriptome sequences. 5 610 SSRs were distributed in 5 099 contigs which accounted for 7.41% of 68 787 contigs. There are 220 kinds of SSR motifs existing in S. mussotii transcriptome. On average, SSRs occurred every 12.60 kb in length. In the SSRs, the tri-nucleotide repeat motif was the most abundant (45.99%), followed by the di-nucleotide (41.62%). AT/TA and AAT/TTA were the main types of motif in di-, tri-nucleotide repeats. The repeat numbers of SSRs which from S. mussotii transcriptome SSRs were mainly from 5 to 10 and motif length of them mostly ranged from 12 bp to 30 bp. A total of 30 651 contigs were annotated, and only 1 447 SSRs were occurred in protein-coding regions. In the six repeat motifs, tri-nucleotide repeats were the most abundant in coding regions (928). There are abundant SSRs in S. mussotii transcriptome with high frequency and various types, indicating their usefulness in theory. This research may lay the foundation for designing the targeted SSR primers and developing SSR molecular markers by mining the information of SSRs loci in S. mussotii transcriptome sequences data.

A Rapid and Simple Method for Cloning and Identification of cDNAs Related with IL-6 Effect / 现代生物医学进展

Cloning of differentially expressed genes is one of the hottest topics in biology.It is very important in cloning genes correlated with phenotype and diseases at molecular level.Here we utilized a simple and rapid PCR-based protocol to detect and isolate cDNA fragments from differentially expressed genes of IL-6-induccd and IL-6-uninduced U937 cells in tWO easy steps.To generate cDNAs from most mRNAs,the first step was reverse transcription using three fully degenerated 6-mer oligonucleotides as primers.The second step was PGR amplification of internal regions of the cDNAs with two or three longer primers with arbitrary but defined sequences.The PCR amplification was repeated on the same cDNA templates(first step) with different sets of primers.DNA fragments were easily displayed by 2% agarose gel electrophoresis and then the differential recovered fragments were used directly in cloning,sequencing,and RNA reverse Northern blot analysis.In this study,seven differential ESTs are obtained;two Sequences not found in GenBank,are novel ESTs.They were proved to be differentially expressed genes related with IL-6 effect by reverse Northern hybridization.

A Rapid and Simple Method for Cloning and Identification of cDNAs Related with IL-6 Effect / 现代生物医学进展

Cloning of differentially expressed genes is one of the hottest topics in biology.It is very important in cloning genes correlated with phenotype and diseases at molecular level.Here we utilized a simple and rapid PCR-based protocol to detect and isolate cDNA fragments from differentially expressed genes of IL-6-induccd and IL-6-uninduced U937 cells in tWO easy steps.To generate cDNAs from most mRNAs,the first step was reverse transcription using three fully degenerated 6-mer oligonucleotides as primers.The second step was PGR amplification of internal regions of the cDNAs with two or three longer primers with arbitrary but defined sequences.The PCR amplification was repeated on the same cDNA templates(first step) with different sets of primers.DNA fragments were easily displayed by 2% agarose gel electrophoresis and then the differential recovered fragments were used directly in cloning,sequencing,and RNA reverse Northern blot analysis.In this study,seven differential ESTs are obtained;two Sequences not found in GenBank,are novel ESTs.They were proved to be differentially expressed genes related with IL-6 effect by reverse Northern hybridization.

Progress in research of aldose reductase inhibitors in traditional medicinal herbs / 中国中药杂志

The traditional medicinal herbs are natural product, and have no obviously toxic action and side effect, and their resources are extensive. The adverse effects produced by aldose reductase inhibitors in traditional medicinal herbs are less than those from chemical synthesis and micro-organism, they can effectively prevent and delay diabetic complication, such as diabetic nephropathy, vasculopathy, retinopathy, peripheral neuropathy, and so on. They will have a wonderful respect. Flavonoid compounds and their derivates from traditional medicinal herbs are active inhibitors to aldose reductase, such as quercetin, silymarin, puerarin, baicalim, berberine and so on. In addition, some compound preparations show more strongly activity in inhibiting aldose reductase and degrading sorbitol contents, such as Shendan in traditional medicinal herbs being active inhibitors and Jianyi capsule, Jinmaitong composita, Liuwei Di-huang pill, et al. The progresses definite functions of treating diabetes complications have been reviewed.