Molecular mechanism of azoles resistant Candida albicans in a patient with chronic mucocutaneous candidiasis

被引:16
作者
Zhang, Ming-rui [1 ]
Zhao, Fei [2 ]
Wang, Shuang [1 ]
Lv, Sha [1 ]
Mou, Yan [1 ]
Yao, Chun-li [1 ]
Zhou, Ying [1 ]
Li, Fu-qiu [1 ]
机构
[1] Second Hosp Jilin Univ, Dept Dermatol, 218 Ziqiang St, Changchun 130000, Peoples R China
[2] Chinese Ctr Dis Control & Prevent, State Key Lab Infect Dis Prevent & Control, Natl Inst Communicable Dis Control & Prevent, Beijing, Peoples R China
关键词
Chronic mucocutaneous candidiasis; STAT1; Candida albicans; Azoles resistance; Over-expression; Drug efflux; OF-FUNCTION MUTATIONS; STAT1; MUTATIONS; IMMUNOLOGY;
D O I
10.1186/s12879-020-4856-8
中图分类号
R51 [传染病];
学科分类号
100401 ;
摘要
BackgroundMore and more azole-resistant strains emerged through the development of acquired resistance and an epidemiological shift towards inherently less susceptible species. The mechanisms of azoles resistance of Candida albicans is very complicated. In this study, we aim to investigate the mechanism of azole-resistant C. albicans isolated from the oral cavity of a patient with chronic mucocutaneous candidiasis (CMC).Case presentationCMC diagnosis was given based on clinical manifestations, laboratory test findings and gene sequencing technique. Minimum inhibitory concentration (MIC) of the fungal isolate, obtained from oral cavity termed as CA-R, was obtained by in vitro anti-fungal drugs susceptibility test. To further investigate the resistant mechanisms, we verified the mutations of drug target genes (i.e. ERG11 and ERG3) by Sanger sequencing, and verified the over-expression of ERG11 and drug efflux genes (i.e. CDR1 and CDR2) by RT-PCR. A heterozygous mutation of c.1162A>G resulting in p.K388E was detected in STAT1 of the patient. The expression of CDR1 and CDR2 in CA-R was 4.28-fold and 5.25-fold higher than that of type strain SC5314, respectively.ConclusionsUp-regulation of CDR1 and CDR2 was mainly responsible for the resistance of CA-R. For CMC or other immunodeficiency patients, drug resistance monitoring is necessary.
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页数:6
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