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首页> 外文期刊>BMC Genomics >Identification, characterization and expression analysis of lineage-specific genes within sweet orange ( Citrus sinensis )
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Identification, characterization and expression analysis of lineage-specific genes within sweet orange ( Citrus sinensis )

机译：甜橙（Citrus sinensis）内谱系特异性基因的鉴定，表征和表达分析

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With the availability of rapidly increasing number of genome and transcriptome sequences, lineage-specific genes (LSGs) can be identified and characterized. Like other conserved functional genes, LSGs play important roles in biological evolution and functions. Two set of citrus LSGs, 296 citrus-specific genes (CSGs) and 1039 orphan genes specific to sweet orange, were identified by comparative analysis between the sweet orange genome sequences and 41 genomes and 273 transcriptomes. With the two sets of genes, gene structure and gene expression pattern were investigated. On average, both the CSGs and orphan genes have fewer exons, shorter gene length and higher GC content when compared with those evolutionarily conserved genes (ECs). Expression profiling indicated that most of the LSGs expressed in various tissues of sweet orange and some of them exhibited distinct temporal and spatial expression patterns. Particularly, the orphan genes were preferentially expressed in callus, which is an important pluripotent tissue of citrus. Besides, part of the CSGs and orphan genes expressed responsive to abiotic stress, indicating their potential functions during interaction with environment. This study identified and characterized two sets of LSGs in citrus, dissected their sequence features and expression patterns, and provided valuable clues for future functional analysis of the LSGs in sweet orange.
机译：随着基因组和转录组序列数目的迅速增加，可以鉴定和鉴定谱系特异性基因（LSG）。像其他保守的功能基因一样，LSG在生物进化和功能中也起着重要的作用。通过对甜橙基因组序列与41个基因组和273个转录组进行比较分析，鉴定了两组柑橘LSG，分别是296种柑橘特有基因（CSG）和1039种甜橙特有的孤儿基因。利用这两组基因，研究了基因结构和基因表达模式。平均而言，与那些进化保守基因（EC）相比，CSG和孤儿基因均具有更少的外显子，更短的基因长度和更高的GC含量。表达谱分析表明，在甜橙的各种组织中表达的大多数LSGs，其中一些表现出不同的时空表达模式。特别地，孤儿基因优先在愈伤组织中表达，愈伤组织是柑橘的重要多能组织。此外，部分CSG和孤儿基因表达了对非生物胁迫的响应，表明它们在与环境相互作用期间的潜在功能。这项研究鉴定和表征了柑橘中的两组LSG，剖析了它们的序列特征和表达模式，并为今后甜橙中LSG的功能分析提供了有价值的线索。

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