生物
基因组
遗传学
线粒体DNA
第二组内含子
假基因
开放式参考框架
基因
内含子
质体
转座因子
打开阅读框
RNA剪接
肽序列
核糖核酸
叶绿体
作者
Sandra W. Clifton,Patrick Minx,Christiane M.-R. Fauron,Michael Gibson,James O. Allen,Hui Sun,Melissa Emery Thompson,W. Brad Barbazuk,Suman Kanuganti,Catherine Tayloe,Louis J. Meyer,Richard K. Wilson,Kathleen J. Newton
出处
期刊:Plant Physiology
[Oxford University Press]
日期:2004-11-01
卷期号:136 (3): 3486-3503
被引量:261
标识
DOI:10.1104/pp.104.044602
摘要
Abstract The NB mitochondrial genome found in most fertile varieties of commercial maize (Zea mays subsp. mays) was sequenced. The 569,630-bp genome maps as a circle containing 58 identified genes encoding 33 known proteins, 3 ribosomal RNAs, and 21 tRNAs that recognize 14 amino acids. Among the 22 group II introns identified, 7 are trans-spliced. There are 121 open reading frames (ORFs) of at least 300 bp, only 3 of which exist in the mitochondrial genome of rice (Oryza sativa). In total, the identified mitochondrial genes, pseudogenes, ORFs, and cis-spliced introns extend over 127,555 bp (22.39%) of the genome. Integrated plastid DNA accounts for an additional 25,281 bp (4.44%) of the mitochondrial DNA, and phylogenetic analyses raise the possibility that copy correction with DNA from the plastid is an ongoing process. Although the genome contains six pairs of large repeats that cover 17.35% of the genome, small repeats (20–500 bp) account for only 5.59%, and transposable element sequences are extremely rare. MultiPip alignments show that maize mitochondrial DNA has little sequence similarity with other plant mitochondrial genomes, including that of rice, outside of the known functional genes. After eliminating genes, introns, ORFs, and plastid-derived DNA, nearly three-fourths of the maize NB mitochondrial genome is still of unknown origin and function.
科研通智能强力驱动
Strongly Powered by AbleSci AI