Yrr1p(for yeast Reveromycin A resistance)是含有锌指结构、关联多药耐受性的转录因子,在介导酿酒酵母耐药及抑制物抗性方面具有重要作用。本文回顾了Yrr1p的发现过程,综述了Yrr1p的结构与功能的关系及其介导酿酒酵母对4-硝基喹啉-N-...Yrr1p(for yeast Reveromycin A resistance)是含有锌指结构、关联多药耐受性的转录因子,在介导酿酒酵母耐药及抑制物抗性方面具有重要作用。本文回顾了Yrr1p的发现过程,综述了Yrr1p的结构与功能的关系及其介导酿酒酵母对4-硝基喹啉-N-氧化物、水杨酸、戴森锰锌及香草醛等抑制物的耐受机制。其中,Yrr1p介导香草醛耐受性机制与其他药物不同。并概括了Yrr1p与其同源转录因子Yrm1p、Pdr8p,以及上级调控因子Pdr1p、Pdr3p之间的调控关系。转录因子Yrr1p的研究对微生物耐药性研究以及构建高抗性微生物细胞工厂具指导意义。展开更多
Background Hirayama disease is a rare disease characterized by juvenile-onset of asymmetric amyotrophy, of which etiology has not been clarified. The aim of our study was to investigate the clinical and neurophysiolog...Background Hirayama disease is a rare disease characterized by juvenile-onset of asymmetric amyotrophy, of which etiology has not been clarified. The aim of our study was to investigate the clinical and neurophysiologic characteristics of Hirayama disease. Methods Neurophysiological tests, including nerve conduction studies （NCS）, F-wave and routine electromyography （EMG）, were performed in seventy-three patients with Hirayama disease. EMG was selectively performed on upper and lower extremities, sternocleidomast and thoracic paravertebral muscles according to the clinical features of the patients. Results Abnormal NCS parameters, including decreased compound muscle action potentials or delayed distal motor latency, were found in 34.2% （25/73） and 12.3% （9/73） of the patients, respectively. A total of 24.6% （18/73） of the patients showed decreased F-wave frequency. EMG demonstrated the presence of neurogenic lesions in all patients with spontaneous potentials, prolonged duration or augmentation of amplitude in motor unit potentials （MUPs）, or a single pattern of MUP recruitment. About 17.8% （13/73） of the patients showed neurogenic lesions, mostly in the C7-8 level of the cervical cord, only in the upper extremity of affected side, whereas 35.6% （26/73） of the patients possessed lesions in the upper extremities bilaterally. A total of 46.6% （34/73） of patients exhibited abnormalities in the lower extremities, sterno- cleidomast or thoracic paravertebral muscle. Changes in motor NCS were significantly correlated with muscle strength. Conclusions EMG detects diffused subclinical neurogenic lesion in a high proportion of patients with Hirayama disease. Results of our study challenge the hypothesis that Hirayama disease is a type of cervical myelopathy.展开更多
文摘Yrr1p(for yeast Reveromycin A resistance)是含有锌指结构、关联多药耐受性的转录因子,在介导酿酒酵母耐药及抑制物抗性方面具有重要作用。本文回顾了Yrr1p的发现过程,综述了Yrr1p的结构与功能的关系及其介导酿酒酵母对4-硝基喹啉-N-氧化物、水杨酸、戴森锰锌及香草醛等抑制物的耐受机制。其中,Yrr1p介导香草醛耐受性机制与其他药物不同。并概括了Yrr1p与其同源转录因子Yrm1p、Pdr8p,以及上级调控因子Pdr1p、Pdr3p之间的调控关系。转录因子Yrr1p的研究对微生物耐药性研究以及构建高抗性微生物细胞工厂具指导意义。
文摘Background Hirayama disease is a rare disease characterized by juvenile-onset of asymmetric amyotrophy, of which etiology has not been clarified. The aim of our study was to investigate the clinical and neurophysiologic characteristics of Hirayama disease. Methods Neurophysiological tests, including nerve conduction studies （NCS）, F-wave and routine electromyography （EMG）, were performed in seventy-three patients with Hirayama disease. EMG was selectively performed on upper and lower extremities, sternocleidomast and thoracic paravertebral muscles according to the clinical features of the patients. Results Abnormal NCS parameters, including decreased compound muscle action potentials or delayed distal motor latency, were found in 34.2% （25/73） and 12.3% （9/73） of the patients, respectively. A total of 24.6% （18/73） of the patients showed decreased F-wave frequency. EMG demonstrated the presence of neurogenic lesions in all patients with spontaneous potentials, prolonged duration or augmentation of amplitude in motor unit potentials （MUPs）, or a single pattern of MUP recruitment. About 17.8% （13/73） of the patients showed neurogenic lesions, mostly in the C7-8 level of the cervical cord, only in the upper extremity of affected side, whereas 35.6% （26/73） of the patients possessed lesions in the upper extremities bilaterally. A total of 46.6% （34/73） of patients exhibited abnormalities in the lower extremities, sterno- cleidomast or thoracic paravertebral muscle. Changes in motor NCS were significantly correlated with muscle strength. Conclusions EMG detects diffused subclinical neurogenic lesion in a high proportion of patients with Hirayama disease. Results of our study challenge the hypothesis that Hirayama disease is a type of cervical myelopathy.
