Genetic Diversity of the Pear Scab Fungus Venturia nashicola in Korea

Scab disease caused by Venturia nashicola is of agroeconomic importance in cultivation of Asian pear. However, little is known about the degree of genetic diversity in the populations of this pathogen. In this study, we collected 55 isolates from pear scab lesions in 13 major cultivation areas in Korea and examined the diversity using sequences of internal transcribed spacer (ITS) region, β-tubulin (TUB2), and translation elongation factor-1α (TEF-1α) genes as molecular markers. Despite a low level of overall sequence variation, we found three distinctive subgroups from phylogenetic analysis of combined ITS, TUB2, and TEF-1α sequences. Among the three subgroups, subgroup 1 (60% of isolates collected) was predominant compared to subgroup 2 (23.6%) or subgroup 3 (16.4%) and was distributed throughout Korea. To understand the genetic diversity among the subgroups, RAPD analysis was performed. The isolates yielded highly diverse amplicon patterns and none of the defined subgroups within the dendrogram were supported by bootstrap values greater than 30%. Moreover, there is no significant correlation between the geographical distribution and the subgroups defined by molecular phylogeny. Our data suggest a low level of genetic diversification among the populations of V. nashicola in Korea.

Steroid Withdrawal(SW) with Simultaneous Administration of Mycophenolate Mofetil(MMF) in Renal Recipients / 대한신장학회잡지

Long term use of steroid induces multiple side effects and morbidity. However, SW has been reported to be associated with increased incidence of acute and chronic rejection, and subsequently reduced graft outcome. MMF inhibits the proliferation and functions of lymphocytes, decreases the incidence of acute rejection in organ transplants, and therefore may decrease the graft rejection associated with SW. We tried to withdraw steroid from 21 renal transplants treated with prednisolone and cyclosporine, who had clinically significant steroid induced side effects. Reasons for SW were diabetes in 15 patients (pre-transplant DM 4 and post-transplant 11), moon face 4 and avascular necrosis of femur 2. Prednisolone was tapered at a rate of 2.5mg every 2 weeks and was discontinued. MMF, 1.0-2.0g/day, was initiated at the beginning of SW. The time interval between transplantation and SW was 26+/-5 (1.5-67) months. Mean age was 48(28-61). Two patients developed MMF-induced GI side effects, and were returned to previous immuno- suppressants. In 1 patient, serum creatinine increased during SW, and steroid was re-administered with the restoration of renal function. In 18(86%) of 21 patients, therefore, steroid was successfully with-drawn. At the follow up of 17+/-1(13-24) months after SW, 1 patient with drug incompliance developed chronic rejection. The rest showed stable renal function. Steroid can be safely withdrawn from renal transplants by simultaneous administration of MMF. The long-term safety, however, needs to be evaluated by prolonged follow up studies.

Effects of Alcohol on Neurocognitive Function, Psychomotor Performance and Subjective Response in Koreans with Different ALDH2 Genotypes

OBJECTIVE: The purpose of this study was to evaluated the effects of alcohol on neurocognitive function, psychomotor performance and subjective response in healthy Korean adults with different ALDH2 genotypes. METHOD: A total of 24 males, half with active ALDH2*1/2*1 and the other with inactive ALDH2*1/2*1, was selected through genotyping using restriction fragment length polymorphism. In a double-blind, placebo-controlled cross-over design, each subject consumed 0.5g/kg dose of alcohol, given as a mixture of 40% vodka and orange juice, and placebo(orange juice) on two separate occasions on an average of weekly intervals. The blood alcohol concentrations(BACs) were measured using a breath analyzer at baseline and at 30, 60 minutes after drinking. P300s were measured at baseline and at 30 minutes after alcohol and placebo intake. Vital signs and psychomotor performance[Critical Flicker Fusion Threshold(CFFT), Choice Reaction Time(CRT), Digit Symbol Substitution(DSS)] were measured at baseline and at 60 minutes after alcohol and placebo intake. Subjective responses were measured at the end of the study. The statistical analysis focused on whether there were any differences between groups with different ALDH2 genotypes. RESULTS: The major results are as follows. 1) BACs in inactive group were overall equivalent to those in the active group. Only in terms of time, BACs were significantly higher overall at 30 minutes than at 60 minutes after alcohol intake. 2) Pulse rates were significantly increased after alcohol intake compared with placebo, and the increase was greater in the inactive than in the active group. 3) P300 latencies in leads Fz(frontal), Cz(cental) and Pz(parietal) were significantly increased after alcohol intake compared to placebo, and the increase was greater in the inactive than in the active group. P300 amplitudes in leads Cz and Pz were significantly decreased overall after alcohol intake compared to placebo. 4) Compared with placebo, alcohol produced significant effect on the psychomotor performance : impairment in the inactive group, improvement in the active group. 5) Compared with placebo, alcohol significantly induced a negative or an intense effect on the subjective responses in the inactive group, but little negative and even a somewhat positive effect in the active group. CONCLUSIONS: These results suggest that ALDH isozyme variance might be an important factor to determine the effects of acute dose of alcohol on the various psychobehavioural functions and also to determine the alcohol use pattern and to predict the future development of alcohol overuse and/or abuse.