Molecular genetic study of a family featuring cardiac conduction block / 中华医学遗传学杂志

OBJECTIVE To explore the genetic mechanism for a family affected with cardiac conduction block. METHODS Affected family members were screened for potential mutations of known candidate genes. As no pathogenic mutation was found, two patients and one healthy member from the family were further analyzed by exomic sequencing followed by Sanger sequencing. The pathogenicity of suspected mutation was analyzed using bioinformatics software. RESULTS Sequencing of the full exome has identified a c.G1725T mutation in the CLCA2 gene. Sanger sequencing has detected the same mutation in all five patients, but not in the normal member from the family. Bioinformatics analysis indicated that the mutation has resulted in substitution of the 575th amino acid cysteine (C) by tryptophan (W). The site is highly conserved and becomes pathogenic with the mutation. CONCLUSION The heterozygous c.G1725T mutation in exon 11 of the CLCA2 gene probably underlies the disease and fit the autosomal dominant pattern of inheritance.

Study of the effect of glycosylphosphatidylinositol-specific phospholipase D on atherosclerosis / 中华老年医学杂志

Objective To investigate the effect of glycosylphosphatidylinositol specific phospholipase D (GPI-PLD) on artherosclerosis.Methods The GPI-PLD activities and mononuclear cells GPI-PLD gene mRNA expression was detected in 102 patients with coronary artery disease and 121 healthy adult.The GPI-PLD highly expressing cell model was constructed and induced by ox-LDL,the HUVEC and HUVEC transfected with pcDNA3.1(+) as blank and control group,respectively.Before and after the induction,the change of cellular function and biological features was detected.Results The peripheral blood GPI-PLD activity of patients with coronary heart disease and normal control were 31.80±4.21 and 44.32±4.50,and the IA ratio of GPI-PLD mRNA expression of mononuclear cells were 0.92±0.16 and 1.53±0.14,respectively.The activity of GPI-PLD and mRNA expression in patients with coronary artery disease were decreased up to 28.2％ (t=21.31,P＜0.01) and 39.9％ (t=30.36,P＜0.01) as compared with healthy control.The adhesion cells,ET-1,reactive oxygen,malondialdehyde (MDA) and the apoptosis rate of GPI-PLD overexpressing HUVEC were lower as compared with blank [29.59=1.40,3.51 ± 0.45,(50.63 ±4.22) ng/L,0.043±0.011,(3.32±0.44) nmol/L vs.41.39±2.15,10.57±1.12,(59.35±4.45)ng/L,0.052±0.011,(5.01±0.69) nmol/L],and as compared with control [42.68±2.45,9.92±1.03,(61.11±4.12) ng/L,0.051±0.007,(4.89±0.71) nmol/l] after inducing by ox-LDL; while the level of nitrogen noxidium (NO) was higher than blank [(29.88± 1.37)μmol/L vs.(21.76±1.02)μmol/L] and control(23.43±0.85)μmol/L groups.Conclusions The expression and activity of GPI-PLD in patients with coronary artery disease are lower than health people.Stable high expression of GPI-PLD is beneficial to vascular endothelial cell injury repairment and prevent the occurrence and development of atherosclerosis.

EXPERIMENTS ON RELATIONSHIP BETWEEN INFECTIONS OF TOXOPLASMA GONDII AND APOPTOSIS OF SPERMATOGEN1C CELLS / 中国血吸虫病防治杂志

Objective To inquire into the relationship between infections of Toxoplasma gondii and apoptosis of spermatogenic cells. Methods Apoptotic spermatogenic cells of mice infected with Toxoplasma gondii were examined by Wright-Giemsa staining and terminal deoxynucleotidyl trans-Icrase (TdT) mediated deoxyuridine triphosphate (dUTP)-biotin nick-end labeling (TUNED techniques. Results Apoptosis rate of infective group of Toxoplasma was significantly higher than thai oi control group (F