CaSfl1 plays a dual role in transcriptional regulation in Candida albicans

As a newly identified transcription factor in Candida albcians, CaSfl1 has been shown to be involved in cell flocculation and filamentation and in the negative regulation of several genes involved in hyphal growth. In this study, we constructed Casfl1△/△ mutants and confirmed that deletion of this gene indeed affected cell flocculation and filamentation. In addition, by RT-PCR we found that while Casfl1 repressed the expression of several hypha-specific genes including HWP1, ECE1, ALS1, ALS3, and FLO8, it strongly activated the expression of the heat-shock protein genes HSP30 and HSP90 under certain stress conditions. Therefore, we propose that CaSfl1 can act as both positive and negative regulators, thereby playing a dual role in transcriptional controls in Candida albicans.

白假丝酵母菌唑类耐药相关的转录调控研究进展

近30年来,白假丝酵母菌已成为导致免疫功能低下患者发病和死亡最常见的条件致病性真菌。随着临床上唑类药物的频繁使用,耐药菌株不断被检出,其耐药机制研究也备受关注。近年来,其在转录调控水平的机制研究也取得了很大进展,明确了耐药相关编码基因的顺式作用元件和反式作用因子,并部分阐述了相应的作用机制。文章就白假丝酵母菌唑类药物耐药相关的转录调控研究进展作一综述。

Tca1元件的转录调控及其对白色念珠菌形态发生的影响

我们从白色念珠菌SC5314中分离到两个逆转录转座子样元件Tcal-1和Tcal-2,它们的物理图谱非常相近,两者都能转录成6kb长的RNA,该转录产物的转录受温度调控,25℃条件下的转录产物多于37℃的,Tcal-1元件内侧部分序列或全部序列的缺失引起白色念珠菌形态的改变,这种形态发生的变化与URA3基因的表达有协同作用。