Long Terminal Repeat Retrotransposon Afut4 Promotes Azole Resistance of Aspergillus fumigatus by Enhancing the Expression of sac1 Gene
- 17 November 2021
- journal article
- research article
- Published by American Society for Microbiology in Antimicrobial Agents and Chemotherapy
- Vol. 65 (12)
- https://doi.org/10.1128/aac.00291-21
Abstract
Aspergillus fumigatus causes a series of invasive diseases, including the high-mortality invasive aspergillosis, and has been a serious global health threat because of its increased resistance to the first-line clinical triazoles. We analyzed the whole-genome sequence of 15 A. fumigatus strains from China and found that long terminal repeat retrotransposons (LTR-RTs), including Afut1, Afut2, Afut3, and Afut4, are most common and have the largest total nucleotide length among all transposable elements in A. fumigatus. Deleting one of the most enriched Afut4977-sac1 in azole-resistant strains decreased azole resistance and downregulated its nearby gene, sac1, but it did not significantly affect the expression of genes of the ergosterol synthesis pathway. We then discovered that 5'LTR of Afut4977-sac1 had promoter activity and enhanced the adjacent sac1 gene expression. We found that sac1 is important to A. fumigatus, and the upregulated sac1 caused the elevated resistance of A. fumigatus to azoles. Finally, we showed that Afut4977-sac1 has an evolution pattern similar to that of the whole genome of azole-resistant strains due to azoles; phylogenetic analysis on both the whole genome and Afut4977-sac1 suggests that the insertion of Afut4977-sac1 might have preceded the emergence of azole-resistant strains. Taking these data together, we found that LTR-RT Afut4977-sac1 might be involved in the regulation of azole resistance of A. fumigatus by upregulating its nearby sac1 gene.Funding Information
- National Natural Science Foundation of China (81971914, 8217082306, 81772163)
This publication has 83 references indexed in Scilit:
- MAFFT Multiple Sequence Alignment Software Version 7: Improvements in Performance and UsabilityMolecular Biology and Evolution, 2013
- Transposon integration enhances expression of stress response genesNucleic Acids Research, 2012
- Human Transposon TectonicsCell, 2012
- Retrotransposons Control Fruit-Specific, Cold-Dependent Accumulation of Anthocyanins in Blood OrangesTHE PLANT CELL ONLINE, 2012
- Fast gapped-read alignment with Bowtie 2Nature Methods, 2012
- Endogenous retrovirus drives hitherto unknown proapoptotic p63 isoforms in the male germ line of humans and great apesProceedings of the National Academy of Sciences of the United States of America, 2011
- The Genome Analysis Toolkit: A MapReduce framework for analyzing next-generation DNA sequencing dataGenome Research, 2010
- SOAP: short oligonucleotide alignment programBioinformatics, 2008
- Analysis of Relative Gene Expression Data Using Real-Time Quantitative PCR and the 2−ΔΔCT MethodMethods, 2001
- Afut1, a retrotransposon-like element from Aspergillus fumigatusNucleic Acids Research, 1996