Effects of the new type palindrome H-heparin-coated dialysis catheter on the systemic coagulation function / 中国组织工程研究

BACKGROUND: The new type Palindrome H-heparin-coated dialysis catheter Is supposed to reduce the Incidence of catheter-related Infection and catheter dysfunction. However, the effect of this new type catheter on the systemic coagulation function Is little reported. OBJECTIVE: To evaluate the effects of the new type heparln-coated dialysis catheter of Palindrome H on the systemic coagulation function In hemodialysis patients. METHODS: Patients who underwent maintenance hemodialysis and could not establish internal fistula at Blood Purification Center of the First People's Hospital of Foshan from January 2014 to June 2016 were enrolled. All participants were divided Into Palindrome H heparln-coated and Permcath noncoated groups depending on the catheter type. The blood platelet count, prothrombin time, international normalized ratio, activated partial thromboplastin time, thrombin time and fibrinogen degradation products were detected and compared between two groups. The study was approved by the Ethics Committee of the First People's Hospital of Foshan, approval No. L[2014]5. RESULTS AND CONCLUSION: Sixty patients were Involved In the study (28 patients used the Palindrome H heparin-coated catheter and 32 patients used Permcath noncoated catheter). All patients were followed up for 30 months. The final measurement outcome was the average value at 0, 3, 6, 9,12,15,18, 21, 24, 27 and 30 months after surgery. No significant difference was found in the blood platelet count, prothrombin time, international normalized ratio, activated partial thromboplastin time, thrombin time or fibrinogen degradation products between two groups (P > 0.05). No heparin induced thrombocytopenia was observed in all participants. Therefore, In clinical practice, the new type Palindrome H-heparin-coated dialysis catheters makes no effect on the systemic coagulation function compared with noncoated catheter.

An algorithm to find all palindromic sequences in proteins.

A palindrome is a set of characters that reads the same forwards and backwards. Since the discovery of palindromic peptide sequences two decades ago, little effort has been made to understand its structural, functional and evolutionary significance. Therefore, in view of this, an algorithm has been developed to identify all perfect palindromes (excluding the palindromic subset and tandem repeats) in a single protein sequence. The proposed algorithm does not impose any restriction on the number of residues to be given in the input sequence. This avant-garde algorithm will aid in the identification of palindromic peptide sequences of varying lengths in a single protein sequence.

Comparative analysis of human masculinity

To study rapidly evolving male specific Y (MSY) genes we retrieved and analyzed nine such genes. VCY, HSFY and RBMY were found to have functional X gametologs, but the rest did not. Using chimpanzee orthologs for XKRY, CDY, HSFY, PRY, and TSPY, the average silent substitution is estimated as 0.017 +/- 0.006/site and the substitution rate is 1.42 x 10(-9)/site/year. Except for VCY, all other loci possess two or more pseudogenes on the Y chromosome. Sequence differences from functional genes show that BPY2, DAZ, XKRY, and RBMY each have one pseudogene for each one that is human specific, while others were generated well before the human-chimpanzee split, by means of duplication, retro-transposition or translocation. Some functional MSY gene duplication of VCY, CDY and HSFY, as well as X-linked VCX and HSFX duplication, occurred in the lineage leading to humans; these duplicates have accumulated nucleotide substitutions that permit their identification.

New Approach to the Analysis of Palindromic Structure in Genome Sequences

PABAP (Palindrome Analysis by BLAST Program) is an analysis system that identifies palindromic sequences from a large genome sequence up to several megabases long. It uses NCBI BLAST as a searching engine, and data processing such as alignment filtration and detection of inverted repeats which satisfy user- defined parameters is performed by manipulating data after populating into a MySQL database. PABAP outperforms publicly available palindrome search program in that it can detect large palindrome with internal spacer at a faster speed from bacterial genomes. It is a standalone application and is freely available for noncommercial users. AVAILABILITY: This application was implemented with free software (Perl, Apache, MySQL, and NCBI BLAST) and is freely available to noncommercial users upon request. Analysis of user data can be carried out directly at http://chimp.kribb.re.kr/~javamint/palindrome.

Nuclear protein binding patterns in the 5'-upstream regulatory elements of HLA class I genes

The expression of MHC class I genes has been thought to be regulated by two major cis-acting regulatory elements. The first region, enhancer A (Enh A) spanning from positions -210 to -165 contains perfect palindrome (PP), TGGGGATTCCCCA. The PP is well-conserved both in mouse and human MHC class I genes, even though the PP is disrupted by 2 bp substitutions (TGAGGATTCTCCA) in HLA-C genes. Three proteins binding to the Enh A of HLA-A and -B locus genes, but very weakly or nearly not to the Enh A of HLA-C locus gene have been identified. To determine functional importance of the PP for binding of trans-acting protein, mutant DNA probes were made by site-directed in vitro mutagenesis and then electrophoretic mobility shift assay was performed. HLA-A mutant DNA probe, in which the PP is disrupted, shows the same nuclear protein binding pattern as that of the HLA-C gene, and HLA-C mutant DNA probe, in which the PP is introduced, shows the same nuclear protein binding pattern as that of the wild type HLA-A gene. These data suggest that the perfect palindrome and its cognate DNA binding nuclear protein play an important role in the HLA class I gene regulation, and thus the lower expression of HLA-C antigen may be ascribed to no or very weak factor binding to the nonpalindromic sequences of HLA-C upstream DNA.