Identification and expression pattern of phosphorus transporter Ⅰ family genes of Phyllostachys edulis
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摘要:
目的 鉴定毛竹Phyllostachys edulis磷转运蛋白Ⅰ (phosphate transporter 1, PHTⅠ)家族基因，分析其表达模式。 方法 利用生物信息学方法，鉴定毛竹PHTⅠ家族成员，分析基因启动子调控元件、编码蛋白的理化性质、基因结构、氨基酸保守基序、基因在染色体的位置、组织表达特异性、基因适应性进化及系统进化等。 结果 毛竹中共鉴定出20个PHTⅠ家族基因 (PePHTs)，分布在10条染色体上，均定位于细胞膜。每个基因都含有1~2个内含子，PePHTs启动子序列中包含干旱、低温等非生物胁迫以及赤霉素等激素类响应元件。毛竹PHTⅠ大部分为碱性蛋白质，分子量为48.61~71.89 kDa，理论等电点为6.84~9.30，疏水性值均大于0，都属于疏水蛋白。基因适应性进化分析显示：大多数PePHTs的选择压力值小于0，说明多数基因受到负选择压力。转录组表达图谱表明：PePHTs在不同组织中的表达存在差异性，说明该基因家族在毛竹生长发育过程中发挥着不同的作用。系统进化树表明：PePHTs都聚类在第Ⅰ亚家族，并且优先和水稻Oryza sativa聚类在同一支上。 结论 PHTⅠ家族在植物吸收和转运磷的过程中扮演了重要作用。本研究结果为深入研究毛竹PHTⅠ家族基因的功能奠定了理论基础。图5表1参45 Abstract:Objective This study is aimed to investigate the family members of phosphorus transporter Ⅰ (PHTⅠ) protein of Moso bamboo (Phyllostachys edulis) and analyze their expression patterns. Method With the employment of the bioinformatics, the PHTⅠ family members of Moso bamboo were identified before an analysis was conducted of the regulatory elements of gene promoters, the physicochemical properties of coding proteins, gene structure, conserved motifs of amino acids, gene positions on chromosomes, tissue expression specificity, gene adaptive evolution and phylogeny. Result PHTⅠ family of Moso bamboo consisted of 20 members distributed on ten chromosomes in the cell membrane and each gene contained 1 to 2 introns while the PePHTs promoter sequence contained elements of abiotic stress such as drought and low temperature and hormone response elements such as Gibberellic acid. Most PHTⅠ from Ph.edulis were basic proteins with the range of molecular weight of PePHTs between 48.61 and 71.89 kDa and that of the theoretical isoelectric point between 6.84 and 9.30. The hydrophobicity value of all PePHTs was greater than zero, indicating that all the proteins in this family were hydrophobic. In terms of gene adaptive evolution, the ω value of most PePHTs genes were lower than zero, indicating that most genes were under negative selection pressure. PePHTs had different expressions in different tissues, which indicated that PePHTs played different roles in the growth and development of Moso bamboo. PePHTs were clustered in the first Ⅰ subfamily, preferentially in the same branch as rice (Oryza sativa). Conclusion In conclusion, PHTⅠ family plays an important role in the absorption and transport of phosphorus in plants and the results of this study have provided a favorable theoretical foundation for a further analysis of the functions of the PHTⅠ family genes in Moso bamboo. [Ch, 5 fig. 1 tab. 45 ref. ] -
图 2 毛竹PHTⅠ家族基因启动子区顺式作用元件位置信息
Figure 2 Location information of cis-acting regulatory elements identified in the promoter region of PHTⅠ gene family in Ph. edulis
图 3 毛竹、拟南芥和水稻PHT家族基因系统进化树
Figure 3 Phylogentic tree of PHT gene family from Ph. edulis, Arabidopsis thaliana and Oryza sative
表 1 毛竹PHTⅠ家族基因编码蛋白序列的理化性质
Table 1. Physicochemical properties of proteins encoded by PHTⅠ gene family in Phyllostachy edulis
基因名称 基因登录号 氨基酸数/个 理论等电点 分子量/kDa 疏水性值 脂肪族氨基酸指数 亚细胞定位 PePHT1 PH02Gene03602 696 7.63 76.37 0.269 92.56 细胞膜 PePHT2 PH02Gene11006 531 9.10 57.69 0.538 98.91 细胞膜 PePHT3 PH02Gene14509 541 9.15 59.64 0.322 95.10 细胞膜 PePHT4 PH02Gene21291 532 8.45 58.05 0.371 89.40 细胞膜 PePHT5 PH02Gene24702 536 8.71 59.02 0.321 90.80 细胞膜 PePHT6 PH02Gene37931 547 8.31 58.97 0.412 92.32 细胞膜 PePHT7 PH02Gene39948 558 8.85 60.96 0.313 93.58 细胞膜 PePHT8 PH02Gene44007 536 8.03 58.49 0.408 91.27 细胞膜 PePHT9 PH02Gene44009 574 8.60 62.35 0.449 94.79 细胞膜 PePHT10 PH02Gene48053 507 8.01 55.77 0.259 87.59 细胞膜 PePHT11 PH02Gene48969 598 9.21 59.84 0.204 83.79 细胞膜 PePHT12 PH02Gene49859 567 8.99 61.45 0.376 92.31 细胞膜 PePHT13 PH02Gene50239 554 8.95 60.55 0.329 93.92 细胞膜 PePHT14 PH02Gene21248 518 8.02 57.42 0.494 105.04 细胞膜 PePHT15 PH02Gene21249 655 6.84 71.89 0.226 90.87 细胞膜 PePHT16 PH02Gene21250 505 9.30 55.46 0.473 105.07 细胞膜 PePHT17 PH02Gene21252 432 9.24 48.61 0.348 101.83 细胞膜 PePHT18 PH02Gene47590 520 8.67 58.31 0.324 90.25 细胞膜 PePHT19 PH02Gene47591 563 8.92 62.63 0.314 94.81 细胞膜 PePHT20 PH02Gene49564 527 8.04 58.50 0.391 97.53 细胞膜 
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