Source identification of human biological materials in crime scene plays an important role in reconstructing the crime process. Searching specific genetic markers to identify the source of different human biological materials is the emphasis and difficulty of the research work of legal medical experts in recent years. This paper reviews the genetic markers which are used for identifying the source of human biological materials and studied widely, such as DNA methylation, mRNA, microRNA, microflora and protein, etc. By comparing the principles and methods of source identification of human biological materials using different kinds of genetic markers, different source of human biological material owns suitable marker types and can be identified by detecting single genetic marker or combined multiple genetic markers. Though there is no uniform standard and method for identifying the source of human biological materials in forensic laboratories at present, the research and development of a series of mature and reliable methods for distinguishing different human biological materials play the role as forensic evi-dence which will be the future development direction.

Objective: To observe the targeting therapy of the hdsFv-RC-RNase recombinant single chain immunotoxin on the xenograft of the human hepatocellular carcinoma in nude mice and to explore its clinical potentiality. Methods: The prokaryotic expression vector TIG-hdsFv-RC-RNase was transformed into E.coli BL21(DE3)plys to largely express recombinant single chain immunotoxin hdsFv-RC-RNase against hepatocellular carcinoma induced by IPTG. The expressed product was purified via Ni-NTA affinity chromatography under native conditions and mildly refolded. The ELISA was used to analyze its immunological activity of antigen-binding capability. The xenogrft model of the human hepatocellular carcinoma in nude mice was established and the targeting therapy of hdsFv-RC-RNase was evaluated. Results:After induced by IPTG, a new protein band with M_r 41 000 was found in the supernatant of the bacteria and expressed in a soluble form. The expressed product was purified to homogeneity via Ni-NTA affinity chromatography under native conditions. The results of ELISA showed the refolded hdsFv-RC-RNase had the specific antigen-binding capability to the human hepatocellular carcinoma cell, but not to the normal hepatocyte (P

Objective To explore the feasibility of detecting of Y-STR of fetal DNA in m aternal plasm a using Ion Torrent PGMTM System . Methods A total of 16 fetal DNA sam ples from m aternal plasm as (8 cases from 38 w eeks gestational age and 8 ones from 12 w eeks) w ere prepared and a m ultiplex assay w ith 7 STR loci (DYS390,DYS391,DYS393,DYS438,DYS437,DYS456,DYS635) w as designed for m ul-tiplex-PC R am plification. U sing Ion Torrent PGMTM System , the results of Y-STR sequences and capillary electrophoresis w ere obtained and com pared. Results Y-STR specific alleles w ere detected in the m ater-nal plasm a of all the pregnant w om en having m ale babies of second and third trim ester, w hich w ere higher than that detected by capillary electrophoresis. C onsistent Y-STR genotypes w ere observed betw een fetal DNA from m aternal plasm a and genom ic DNA from the new born babies. Conclusion B ased on Ion Torrent PGMTM System , the prenatal Y-STR detection m ethod m ay provide a high-sensitive and high-throughput choice for prenatal STR detection in forensic testing.

There are two kinds ofamelogeningene mutation, including mutation in primer-binding re-gion ofamelogeningene and micro deletion of Y chromosome encompassingamelogeningene, and the latter is more common. The mechanisms of mutation in primer-binding region ofamelogeningene is nu-cleotide point mutation and the mechanism of micro deletion of Y chromosome encompassingamelo-geningene maybe non-allelic homologous recombination or non-homologous end-joining. Among the population worldwide, there is a notably higher frequency ofamelogeningene mutations in Indian popu-lation, Sri Lanka population and Nepalese population which reside within the Indian subcontinent. Thoughamelogeningene mutations have little impact on fertility and phenotype, they might cause incor-rect result in gender identification. Using composite-amplification kit which including autosomal STR lo-cus,amelogeningene locus and multiple Y-STR locus, could avoid wrong gender identification caused byamelogeningene mutation.

Chronic kidney disease,especially in patients with end-stage renal disease (ESRD),is prone to causing secondary hyperparathyroidism,and part of refractory secondary hyperparathyroidism patients require treatment with parathyroidectomy.Parathyroidectomy makes the thyroid inevitably subject to mechanical stimulation,leading to transient mechanical thyroiditis,hyperthyroxinemia and postoperative transient thyrotoxicosis,causing dysfunction in multiple systems of the body,and even inducing or aggravating water and electrolyte disorders (such as hyperkalemia),arrhythmia and cardiovascular events.However,this complication has not yet received sufficient clinical attention.This article will discuss the prevention and treatment of thyrotoxicosis or hyperthyroidism,one of the postoperative complications,in secondary hyperparathyroidism patients with ESRD,based on the relevant documents and our own clinical practice.

ObjectiveTo investigate primary and secondary transfer of exfoliated cells from human hands on non-porous substrates such as plastic steering wheel or computer mouse. MethodsDNA detection sensitivity and detection limit for mixed DNA profiling were examined to understand our laboratory’s ability to test for trace DNA. Forensic swabs were used to collect samples from volunteers’ one-hour-long unwashed hands， substrates touched by volunteers’ dominant hand 30 min after hand washing， substrates touched by volunteers 30 min after washing their hands and then immediately or 30 min following shaking hands， and individual A’s daily-use substrates touched by individual B and then by individual A again. Simulations were conducted to assess the potential for introduction of another person’s exfoliated cells from hands into routine casework samples. ResultsOur laboratory can obtain a full DNA profile from as little as 0.020 ng of DNA and detect minor components in a 1：9 mixed DNA sample. 85% of samples from unwashed hands yielded a full DNA profile. Primary transfer of a full DNA profile was found in 77% of substrates touched by volunteers’ dominant hand 30 min after hand washing， allowing differentiation between good and poor shedders， with no significant difference in genders and substrate types. 75% of substrates touched 30 min after hand washing and then immediately following handshaking yielded the other individual’s DNA profile （secondary transfer）， with the number of short tandem repeat （STR） loci detected ranging from 0 to 23； the percentage and number decreased substantially when the substrates were touched 30 minutes later. No foreign DNA was detected in routine casework samples with introduced exfoliated cells from hands. When two individuals took turns touching items with their hands， the major contributor to the DNA profile was not always the individual who made the last contact. ConclusionsPrimary and secondary DNA transfer can be detected on non-porous substrates， and based on the deposit of hand exfoliated cells， individuals can be categorized as good or poor shedders， which is an important factor affecting detection of DNA transfer. Besides considering the laboratory’s DNA detection sensitivity， if DNA is detected on substrates by hand contact， we need to take into account the potential for secondary transfer at different levels of activity when interpreting the results.