基础菌菌菌酵母和人类病原体Cryptococcus neoformans的基因组
Brendan J Loftus1, Eula Fung, Paola Roncaglia
1Institute for Genomic Research, 9712 Medical Center Drive, Rockville, MD 20850, USA. bjloftus@tigr.org
Science (New York, N.Y.)
|January 18, 2005
概括
机会性真菌病原体Cryptococcus neoformans的基因组被测序,揭示了独特的基因和转位子,这可能解释了它的毒性和变异. 这一发现促进了对真菌病原和Cryptococcus neoformans生物学的理解.
科学领域:
- 菌类学 菌类学是指菌类学.
- 基因组学就是基因组学.
- 病原体生物学 病原体生物学
背景情况:
- 新型菌是环境酵母和一个重要的机会主义人类病原体.
- 它是研究真菌病原学的关键模型生物.
- 了解其遗传构成是解决其全球健康影响的关键.
研究的目的:
- 为了测序和分析Cryptococcus neoformans的基因组.
- 识别导致其毒性和表型变异的遗传元素.
- 为了比较不同C. neoformans菌株之间的基因组差异.
主要方法:
- 关于Cryptococcus neoformans的全基因组测序. 这是一个很好的例子.
- 基因结构的生物信息分析,替代拼接和反意义信息.
- 比较基因组学以确定菌株之间的变异.
主要成果:
- 大约20兆基基因组包含大约6500个内部丰富基因.
- 转录组富含替代拼接和反意义信息.
- 该基因组在转位子中很丰富,特别是在离心体区域附近,这可能会导致不稳定.
- 发现了可能与毒性相关的独特基因.
- 两种菌株的比较显示了基因含量和序列多态度的变化.
结论:
- 基因组测序为C. neoformans研究提供了一个基础资源.
- 转子子和独特的基因可能是C. neoformans毒性和适应性的贡献者.
- 基因组变异在C. neoformans菌株中观察到的表型多样性中发挥着作用.
相关概念视频
00:46Genomic DNA in Prokaryotes
The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
Although bacterial genomes are much...
Genomic Diversity in Bacteria
Although bacterial genomes are much...
00:58Genomic DNA in Eukaryotes
Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
02:16Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes
The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
01:18Mutations in Microorganisms
Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
01:08Evolution of Microbial Genome
Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.
01:27Cryptococcal Meningitis
Cryptococcal meningitis is a life-threatening opportunistic infection predominantly associated with HIV/AIDS, accounting for over 100,000 deaths annually worldwide. However, it also affects individuals with other forms of immunosuppression, including those undergoing immunosuppressive therapy, organ transplant recipients, patients with innate immunodeficiencies, and individuals with hematological disorders. The infection is caused mainly by Cryptococcus neoformans and Cryptococcus gattii,...