The Evolution of Mitochondrial Genomes between Two Cymbidium Sister Species: Dozens of Circular Chromosomes and the Maintenance and Deterioration of Genome Synteny

doi:10.3390/genes14040864

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	The Evolution of Mitochondrial Genomes between Two Cymbidium Sister Species: Dozens of Circular Chromosomes and the Maintenance and Deterioration of Genome Synteny
	Li,Xiaoling; Zhe,Mengqing; Huang,Yiwei; Fan,Weishu; Yang,Junbo; Zhu,Andan
	2023
发表期刊	GENES
ISSN	2073-4425
卷号	14 期号:4 页码:864
摘要	Plant mitochondrial genomes (mitogenomes) exhibit fluid genome architectures, which could lead to the rapid erosion of genome synteny over a short evolutionary time scale. Among the species-rich orchid family, the leafy Cymbidium lancifolium and leafless Cymbidium macrorhizon are sister species with remarkable differences in morphology and nutritional physiology. Although our understanding of the evolution of mitochondria is incomplete, these sister taxa are ideal for examining this subject. In this study, the complete mitogenomes of C. lancifolium and C. macrorhizon, totaling 704,244 bp and 650,751 bp, respectively, were assembled. In the 2 mitogenomes, 38 protein-coding genes, 18 cis- and 6 trans-spliced introns, and approximately 611 Kb of homologous sequences are identical; overall, they have 99.4% genome-wide similarity. Slight variations in the mitogenomes of C. lancifolium and C. macrorhizon in repeat content (21.0 Kb and 21.6 Kb, respectively) and mitochondrial DNA of plastid origin (MIPT; 38.2 Kb and 37.5 Kb, respectively) were observed. The mitogenome architectures of C. lancifolium and C. macrorhizon are complex and comprise 23 and 22 mini-circular chromosomes, respectively. Pairwise comparisons indicate that the two mitogenomes are largely syntenic, and the disparity in chromosome numbers is likely due to repeat-mediated rearrangements among different chromosomes. Notably, approximately 93.2 Kb C. lancifolium mitochondrial sequences lack any homology in the C. macrorhizon mitogenome, indicating frequent DNA gains and losses, which accounts mainly for the size variation. Our findings provide unique insights into mitogenome evolution in leafy and leafless plants of sister species and shed light on mitogenome dynamics during the transition from mixotrophy to mycoheterotrophy.
关键词	mitogenome multi-chromosomes genome synteny recombination nutritional modes PLANT MITOCHONDRIAL ALIGNMENT SEQUENCE RATES MYCOHETEROTROPHY ORGANIZATION CHLOROPLAST FERTILE FUNGI
学科领域	Genetics & Heredity
DOI	10.3390/genes14040864
WOS记录号	WOS:000977461200001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/75010
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Li,Xiaoling,Zhe,Mengqing,Huang,Yiwei,et al. The Evolution of Mitochondrial Genomes between Two Cymbidium Sister Species: Dozens of Circular Chromosomes and the Maintenance and Deterioration of Genome Synteny[J]. GENES,2023,14(4):864.
APA	Li,Xiaoling,Zhe,Mengqing,Huang,Yiwei,Fan,Weishu,Yang,Junbo,&Zhu,Andan.(2023).The Evolution of Mitochondrial Genomes between Two Cymbidium Sister Species: Dozens of Circular Chromosomes and the Maintenance and Deterioration of Genome Synteny.GENES,14(4),864.
MLA	Li,Xiaoling,et al."The Evolution of Mitochondrial Genomes between Two Cymbidium Sister Species: Dozens of Circular Chromosomes and the Maintenance and Deterioration of Genome Synteny".GENES 14.4(2023):864.

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