Pentatricopeptide repeat proteins and their emerging roles in plants

Saha, Dipnarayan; Prasad, Anand Mohan; Srinivasan, Raji

doi:10.1016/j.plaphy.2007.03.026

Cited by 140 publications

(116 citation statements)

References 102 publications

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“…Genes identified in this study were related to many aspects of plant cell metabolism, such as signal transduction, metabolism of amino acids, secondary metabolites, saccharides, and fatty acids. Mutation in these genes affects seed development and the embryogenesis process (Baud et al 2003;Lara et al 2003;Suda and Giorgini 2003;Schaller 2004;Saha et al 2007). The low number of repeated annotated genes represented by single ESTs identified in this work indicates an efficient normalization of the libraries, as only the PPR and SPA genes were represented by more than four ESTs.…”

Section: Discussionmentioning

confidence: 79%

Identification and Analysis of Differentially Expressed Genes During Seed Development Using Suppression Subtractive Hybridization (SSH) in Phaseolus vulgaris

et al. 2011

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Interspecific hybridization in the genus Phaseolus, conducted to introgress desired traits into common bean (Phaseolus vulgaris L.), leads to the abortion of immature embryos, usually at early developmental stages. Little is known about the physiological responses of embryo dysfunction in P. vulgaris during the early stages of embryogenesis and the genes that are involved in these responses. Identification of the genes involved in Phaseolus embryogenesis may provide information that will help to understand the molecular basis of Phaseolus embryo dysfunction. To investigate the genes expressed during Phaseolus seed development, we constructed a suppression subtractive hybridization (SSH) library using cDNA from abortive seed development as the driver and those from normal seed development as tester. The differentially expressed cDNA fragments were identified by differential screening. We identified 72 unique ESTs of which we selected 12 candidates on the basis of their redundancy. These candidates were subjected to a validation procedure based on the study of their expression level by real-time PCR. Sequence analysis revealed that most of the differentially expressed genes are related to metabolism and regulation such as protein synthesis. Some genes also encoded transcription factors. These genes showed high mRNA transcript levels in seed tissues and little or no expression in other tissues (root, stem, flower, leaf, and cotyledon). Seven genes were chosen and their expression profile during seed development in P. vulgaris was analyzed by real-time PCR using RNA preparations originating from different seed development stages. This study revealed hitherto unknown genes putatively involved in dicotyledonous embryogenesis, which serve as a starting point for understanding Phaseolus embryogenesis.

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Section: Discussionmentioning

confidence: 79%

Identification and Analysis of Differentially Expressed Genes During Seed Development Using Suppression Subtractive Hybridization (SSH) in Phaseolus vulgaris

et al. 2011

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“…PPR proteins have been implicated in many crucial functions including chloroplast biogenesis, embryogenesis fertility restoration in CMS plants, and plant development (Saha et al, 2007). An emerging theme of PPR protein function is regulation of various aspects of gene expression in plastids, including transcription, splicing, RNA cleavage, RNA editing, translation, and RNA stabilization (SchmitzLinneweber and Small, 2008).…”

Section: Ysa Encodes a Ppr Protein Essential For Chloroplast Biogenesmentioning

confidence: 99%

Disruption of a Rice Pentatricopeptide Repeat Protein Causes a Seedling-Specific Albino Phenotype and Its Utilization to Enhance Seed Purity in Hybrid Rice Production

Hu²,

Wu³

et al. 2012

Plant Physiology

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The pentatricopeptide repeat (PPR) gene family represents one of the largest gene families in higher plants. Accumulating data suggest that PPR proteins play a central and broad role in modulating the expression of organellar genes in plants. Here we report a rice (Oryza sativa) mutant named young seedling albino (ysa) derived from the rice thermo/photoperiod-sensitive genic male-sterile line Pei'ai64S, which is a leading male-sterile line for commercial two-line hybrid rice production. The ysa mutant develops albino leaves before the three-leaf stage, but the mutant gradually turns green and recovers to normal green at the sixleaf stage. Further investigation showed that the change in leaf color in ysa mutant is associated with changes in chlorophyll content and chloroplast development. Map-based cloning revealed that YSA encodes a PPR protein with 16 tandem PPR motifs. YSA is highly expressed in young leaves and stems, and its expression level is regulated by light. We showed that the ysa mutation has no apparent negative effects on several important agronomic traits, such as fertility, stigma extrusion rate, selfed seed-setting rate, hybrid seed-setting rate, and yield heterosis under normal growth conditions. We further demonstrated that ysa can be used as an early marker for efficient identification and elimination of false hybrids in commercial hybrid rice production, resulting in yield increases by up to approximately 537 kg ha 21 .

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“…Although mitochondrial functions are conserved among eukaryotes, genome structure and the regulatory mechanisms for gene expression in mitochondria are, surprisingly, quite divergent 3 . Plants are unique in that they possess extremely large mitochondrial genomes 4 and exhibit complex mechanisms for editing mitochondrial mRNA 5,6 involving a large family of pentatricopeptide repeat proteins 7,8 . Presumably due to their sessile lifestyle and/or the presence of plastids, regulation of mitochondrial gene expression appears to be quite important for plants.…”

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confidence: 99%

A poly(A)-specific ribonuclease directly regulates the poly(A) status of mitochondrial mRNA in Arabidopsis

et al. 2013

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Coordination of gene expression in the organelles and the nucleus is important for eukaryotic cell function. Transcriptional and post-transcriptional gene regulation in mitochondria remains incompletely understood in most eukaryotes, including plants. Here we show that poly(A)-specific ribonuclease, which influences the poly(A) status of cytoplasmic mRNA in many eukaryotes, directly regulates the poly(A) tract of mitochondrial mRNA in conjunction with a bacterial-type poly(A) polymerase, AGS1, in Arabidopsis. An Arabidopsis poly(A)-specific ribonuclease-deficient mutant, ahg2-1, accumulates polyadenylated mitochondrial mRNA and shows defects in mitochondrial protein complex levels. Mutations of AGS1 suppress the ahg2-1 phenotype. Mitochondrial localizations of AHG2 and AGS1 are required for their functions in the regulation of the poly(A) tract of mitochondrial mRNA. Our findings suggest that AHG2 and AGS1 constitute a regulatory system that controls mitochondrial mRNA poly(A) status in Arabidopsis.

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Pentatricopeptide repeat proteins and their emerging roles in plants

Cited by 140 publications

References 102 publications

Identification and Analysis of Differentially Expressed Genes During Seed Development Using Suppression Subtractive Hybridization (SSH) in Phaseolus vulgaris

Identification and Analysis of Differentially Expressed Genes During Seed Development Using Suppression Subtractive Hybridization (SSH) in Phaseolus vulgaris

Disruption of a Rice Pentatricopeptide Repeat Protein Causes a Seedling-Specific Albino Phenotype and Its Utilization to Enhance Seed Purity in Hybrid Rice Production

A poly(A)-specific ribonuclease directly regulates the poly(A) status of mitochondrial mRNA in Arabidopsis

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