Genome-Wide Insights Into the Organelle Translocation of Photosynthetic NDH-1 Genes During Evolution

Abstract

Translocation of chloroplast-located genes to mitochondria or nucleus is considered to be a safety strategy that impedes mutation of photosynthetic genes and maintains their household function during evolution. The organelle translocation strategy is also developed in photosynthetic NDH-1 (pNDH-1) genes but its understanding is still far from complete. Here, we found that the mutation rate of the conserved pNDH-1 genes was gradually reduced but their selection pressure was maintained at a high level during evolution from cyanobacteria to angiosperm. By contrast, oxygenic photosynthesis-specific (OPS) pNDH-1 genes had an opposite trend, explaining the reason why they were transferred from the reactive oxygen species (ROS)-enriched chloroplast to the ROS-barren nucleus. Further, genome-wide sequence analysis supported the possibility that all conserved pNDH-1 genes lost in chloroplast genomes of Chlorophyceae and Pinaceae were transferred to the ROS-less mitochondrial genome as deduced from their truncated pNDH-1 gene fragments. Collectively, we propose that the organelle translocation strategy of pNDH-1 genes during evolution is necessary to maintain the function of the pNDH-1 complex as an important antioxidant mechanism for efficient photosynthesis.

Introduction

During evolution of photosynthetic organisms, the rise of O₂ and environmental stress inevitably results in the production of reactive oxygen species (ROS), which can trigger the mutation of genes under the low selection pressure (Ishikawa et al., 2008; Otten and Smeets, 2015). It is well known that in eukaryotic photosynthetic organisms, genes are located in the genomes of chloroplast, mitochondria, and nucleus. Considering the O₂ content, the ROS concentrations of chloroplast, mitochondria, and nucleus under environmental stresses are assumed to be relatively abundant, less, and barren, respectively (Allen and Raven, 1996; Martin and Herrmann, 1998; Adams and Palmer, 2003; Foyer and Noctor, 2003; Laloi et al., 2004; Zhao et al., 2020). As a consequence, the organelle translocation is considered to be an important safety strategy that impedes mutation of photosynthetic genes and maintains their household function during evolution.

Complete sequencing of the chloroplast genomes of Marchantia polymorpha and Nicotiana tabacum unexpectedly demonstrates the presence of photosynthetic NDH-1 (pNDH-1) (hereafter referred to as pNDH-1) genes (Ohyama et al., 1986; Shinozaki et al., 1986). All complexes of pNDH-1 are involved in cyclic electron transfer around photosystem I (Bernát et al., 2011), which is an important antioxidant mechanism that balances the ATP/NADPH ratio required for the Calvin–Benson cycle and reduces the ROS production (Arnon, 1971; Kramer and Evans, 2011). They consist of conserved subunits (NdhA to NdhK) and oxygenic photosynthesis-specific (OPS) subunits (such as NdhL to NdhQ, NdhS, and NdhV) (Laughlin et al., 2019; Schuller et al., 2019, 2020; Pan et al., 2020; Zhang et al., 2020; Shen et al., 2022). It is found that these conserved genes of pNDH-1 reside in chloroplast genome (Ohyama et al., 1986; Shinozaki et al., 1986) but its OPS genes are translocated to the nucleus genome (Rumeau et al., 2005; Ishikawa et al., 2008; Shimizu et al., 2008; Suorsa et al., 2009; Yamamoto et al., 2011; Fan et al., 2015). However, little is known regarding the reason why these OPS pNDH-1 genes are translocated to the nucleus genome. In addition, genome-wide sequence analysis of pNDH-1 genes in Chlorophyceae and Pinaceae indicates that OPS pNDH-1 genes reside also in the nucleus genome, but all conserved pNDH-1 genes are lost entirely in the chloroplast and nucleus genomes (Wakasugi et al., 1994; Maul et al., 2002; Nystedt et al., 2013; Neale et al., 2014; Ranade et al., 2016; Lin et al., 2017). However, as yet, whether all these conserved pNDH-1 genes have been lost entirely or transferred to the mitochondrial genome remains a mystery.

Here, we calculated and analyzed the mutation frequency and selection pressure, explaining the reason why these OPS pNDH-1 genes were transferred from chloroplast to the nucleus. Further, we found the presence of conserved pNDH-1 gene fragments in mitochondrial genomes of Chlorophyceae and Pinaceae, implying that these conserved pNDH-1 genes lost in chloroplast genomes of Chlorophyceae and Pinaceae were transferred to their mitochondrial genomes. Collectively, our data provide new insights into the organelle translocation of pNDH-1 genes during evolution from cyanobacteria to angiosperm.

Materials and Methods

Phylogenetic Analysis

Phylogenetic tree was constructed based on rbcL gene of Methanogen, Cyanobacteria, Chlorophyceae, Bryophyta, Pinaceae, Monocots, and Dicots. The gene sequences of rbcL from different species were obtained from the National Center for Biotechnology Information (NCBI¹). The names of the selected species and their GenBank accession numbers are listed in Supplementary Table 1. Sequence alignments were performed using MUSCLE (Edgar, 2004). The aligned dataset was analyzed in Data Analysis in Molecular Biology and Evolution (DAMBE) version 7 (Xia, 2018), and was converted into MEGA format. Unrooted phylogenetic trees were created using MEGA version 7 (Kumar et al., 2016) and maximum likelihood method (Felsenstein, 1981) with the bootstrap support of 1,000 replicates. Creating the phylogenetic tree, the parameters used were: complete deletion of gaps/missing data, distance model set to applying the nucleotide kimura-2-parameter, homogeneous pattern among lineages and uniform rates among sites and using the maximum composite likelihood model. The FigTree (v1.3.1²) was used for the unrooted phylogenetic tree visualization.

Calculation of Synonymous Substitution Rate and Non-synonymous Substitution Rate

The values of synonymous substitution rate (d_S) and non-synonymous substitution rate (d_N) were calculated using DNAsp6 software (Rozas et al., 2017). We first removed the terminators of each sequence and then used MUSCLE for sequence alignment, and the alignments of all these genes of pNDH-1 and rNDH-1 were converted into a codon alignment using TranslatorX (Abascal et al., 2010). The ambiguously aligned regions were excluded using trimAl v1.2 (Capella-Gutiérrez et al., 2009) and the results were exported as a Fasta file. Having opened the exported file with DNAsp6, we set the genomic state and chromosomal location, assigned the coding regions, and calculated the d_S and d_N values. The average values were calculated using SigmaPlot 14.0.

Calculation of Amino Acid Conservative Substitution

Calculation of amino acid conservative substitution (K_c) was carried out with the aid of a pipeline SAMEM v.0.83.³ The SAMEM package (Gunbin et al., 2011) has a major path for the gene evolution analysis. We divided these 20 amino acids into two groups according to their physicochemical properties, such as volume (RQEHILKMFWYV ANDCGPST), which are related to protein function. Amino acid substitutions within groups are called conservative substitutions (Hanada et al., 2007). The general step and method of calculating K_c are as follows: translation of nucleic acid sequence into amino acid sequence by Transeq, multiple alignment of amino acid sequences by the Mafft 6.717 algorithm (Katoh and Toh, 2008) using the BLOSUM 62 matrix (Henikoff and Henikoff, 1992), and models of amino acid substitutions were calculated based on multiple alignment using the Modelestimator algorithm (Arvestad, 2006), phylogenetic trees were calculated on the basis of the replacement model using FastTree 2.1.1 (Price et al., 2010), ancestral gene sequences are reconstructed based on gapless alignments of codons using FASTML (Pupko et al., 2002), calculation of K_c using Zhang’s (2000) method (the HON-NEW program). For each of 531 properties (Kawashima et al., 2008), amino acids are divided into classes by k-means clustering using R.

Sequence Analysis

Homology search was performed by comparing amino acid sequences with sequences in local nucleotide databases (TBLASTN). Eleven Arabidopsis thaliana pNDH-1 gene sequences were used as templates for TBLASTN searches of Chlorophyceae and Pinaceae mitochondrial genomes. The TBLASTN expectation value threshold E was altered to 10 to allow for a less stringent alignment search.

Data Availability

The data underlying this article are available within the NCBI GenBank database,⁴ and all GenBank accession numbers are listed in Supplementary Table 1. The alignments analyzed in this study are available in the article’s online Supplementary Figures 2–4.

Results

Phylogenetic Tree Marks These Important Evolutionary Events of Photosynthetic NDH-1

Genome-wide sequence analysis suggests that pNDH-1 originates from a group 4 membrane-bound [NiFe] hydrogenase (Böhm et al., 1990; Peltier et al., 2016) and evolves from archaea (gray tree branches in Figure 1) to prokaryote (blue tree branches in Figure 1) and to eukaryotic photosynthetic organisms (green tree branches in Figure 1). In eukaryotic photosynthetic organisms except Chlorophyceae, Pinaceae and Orchidaceae, conserved pNDH-1 genes reside in chloroplast genome, whereas OPS pNDH-1 genes are transferred to the nucleus genome (Rumeau et al., 2005; Ishikawa et al., 2008; Shimizu et al., 2008; Suorsa et al., 2009; Yamamoto et al., 2011; Fan et al., 2015). In addition, in eukaryotic Chlorophyceae and Pinaceae (red species name in Figure 1), OPS pNDH-1 genes reside also in the nucleus genome, but all conserved pNDH-1 genes are lost entirely in their chloroplast and nucleus genomes (Wakasugi et al., 1994; Maul et al., 2002; Lin et al., 2017). The below investigations will try to explain the reason why these OPS pNDH-1 genes in eukaryotic photosynthetic organisms except Chlorophyceae, Pinaceae, and Orchidaceae were transferred from chloroplast genome to the nucleus genome and unravel the mystery whether conserved pNDH-1 genes of Chlorophyceae and Pinaceae have been lost entirely or transferred to the mitochondrial genome.

FIGURE 1

An Evolutionary Trend of Conserved and Oxygenic Photosynthesis-Specific Photosynthetic NDH-1 Genes

During the evolution process from cyanobacteria to dicots, we found that the mutation rate of conserved pNDH-1 genes was gradually decreased, as deduced from the results of d_S (Figures 2A–F). This was supported by the data of K_c (Supplementary Figure 1). As a consequence, the mutation rate of conserved pNDH-1 genes has a trend of gradual decrease during evolution.

FIGURE 2

To fully understand the trend of conserved pNDH-1 genes during evolution, we calculated the ratio of d_N to d_S. Our data indicated that all d_N/d_S ratios of conserved pNDH-1 genes were less than 1 (Figures 3A–F), indicating that the evolutional rate of all these conserved pNDH-1 genes was relatively slow and under the purifying selection (Endo et al., 1997; Messier and Stewart, 1997). Further, under the purifying selection, the magnitude of d_N/d_S values could reflect the selection pressure of these conserved pNDH-1 genes (Berg and Kurland, 2000). If the d_N/d_S ratio was more close to 0, the selection pressure was higher, whereas if the ratio was more close to 1, the selection pressure was lower. We found that the selection pressure of conserved pNDH-1 genes was increased during evolution from cyanobacteria to dicots, as deduced from the results of d_N/d_S values (Figures 3A–F). Collectively, we propose that conserved pNDH-1 genes have an evolutionary trend that the mutation rate was gradually decreased but the selection pressure was maintained at a relatively high level.

FIGURE 3

Unexpectedly, the mutation rate of OPS pNDH-1 genes was increased and kept at a high level during evolution from cyanobacteria to dicots, as deduced from the d_S values (Figures 2A–F). Meanwhile, the selection pressure of OPS pNDH-1 genes was deceased during evolution from cyanobacteria to dicots, as deduced from the data of d_N/d_S values (Figures 3A–F). Taking all these results together, we can clearly find that OPS and conserved pNDH-1 genes have a distinctly different trend of their mutation rate and selection pressure during evolution.

Presence of Photosynthetic NDH-1 Gene Fragments in the Mitochondrial Genomes of Chlorophyceae and Pinaceae

To unravel the mystery whether these conserved pNDH-1 genes have been lost entirely or transferred to the mitochondrial genome, we conducted the sequence searches in the mitochondrial genomes of Chlorophyceae and Pinaceae using pNDH-1 sequences of Arabidopsis thaliana as templates. Our results revealed that the fragments of conserved pNDH-1 genes lost in the chloroplast genomes of Chlorophyceae and Pinaceae were found to be in their mitochondrial genomes (Figure 4 and Supplementary Figures 2–4). Collectively, we propose that these conserved pNDH-1 genes lost in the chloroplast genomes of Chlorophyceae and Pinaceae were transferred to their mitochondrial genomes.

FIGURE 4

A Trend of Respiratory NDH-1 Genes During Evolution

Consistent with the conserved pNDH-1 genes, the mutation rate of respiratory NDH-1 (rNDH-1) genes was gradually decreased but their selection pressure was maintained at a relatively high level during evolution from methanogen to dicots (pink in Figures 5A,B). However, the mutation rate and selection pressure of rNDH-1 genes in Chlorophyceae and Pinaceae did not follow the trend of rNDH-1 during evolution from methanogen to dicots (red in Figures 5A,B). It is reasonable to infer that the transfer of chloroplast pNDH-1 genes of Chlorophyceae and Pinaceae to their mitochondrial genomes results in mitochondrial DNA rearrangement, thereby increasing the mutation rate of rNDH-1 genes and relatively decreasing their selection pressure. This supports the conclusion that these conserved pNDH-1 genes lost in chloroplast genomes of Chlorophyceae and Pinaceae were transferred to their mitochondrial genomes.

FIGURE 5

Discussion

During the evolution from prokaryotic cyanobacteria to eukaryotic angiosperm, organelle translocation is considered to be an important safety strategy that impedes mutation of photosynthetic genes and maintain their household function (Baldauf and Palmer, 1990; Gantt et al., 1991; Martin et al., 1998; Adams and Palmer, 2003; Rokka et al., 2005). Such organelle translocation is also found to be a universal safety strategy, for example, the mitochondrial genome contains between 1 and 10% of chloroplast sequences in different seed plants (Stern and Lonsdale, 1982; Joyce and Gray, 1989; Wang et al., 2007, 2012). In eukaryotic photosynthetic organisms except Chlorophyceae, Pinaceae, and Orchidaceae, OPS pNDH-1 genes are found to transfer from chloroplast genome to the nucleus genome during evolution (Rumeau et al., 2005; Ishikawa et al., 2008; Shimizu et al., 2008; Suorsa et al., 2009; Yamamoto et al., 2011; Fan et al., 2015), although conserved pNDH-1 genes still reside in chloroplast genome (Ohyama et al., 1986; Shinozaki et al., 1986).

The results of this study found that two distinctly different strategies have been developed by conserved and OPS pNDH-1 genes to impede their mutations and maintain their functions (Figures 2, 3 and Supplementary Figure 1). Conserved pNDH-1 genes develop a safety strategy via decreasing their mutation rate and increasing their selection pressure, while OPS pNDH-1 genes develop another safety strategy via transferring them from the chloroplast genome to a relatively safe nucleus genome (Figures 2, 3 and Supplementary Figure 1). It is worthy of note that according to Mahler’s ratchet effect (Muller, 1964), gene recombination is lacked in chloroplast because of no sexual reproduction. When a gene is successfully transferred from chloroplast to nuclear, in other words, from asexual to sexual, gene recombination is restored and provides a chance to get rid of the fate crisis of gene mutation, reinforcing the conclusion that the nucleus is much safer than the chloroplast. Collectively, during evolution of photosynthetic organisms, these two distinctly different strategies jointly maintain the function of pNDH-1 as an important antioxidant mechanism for efficient photosynthesis through impeding mutation of its conserved and OPS genes.

Consistent with the previously reported Orchidaceae (Lin et al., 2015, 2017), these conserved pNDH-1 genes lost in Chlorophyceae and Pinaceae were transferred from chloroplast genome to the mitochondrial genome as deduced from their common gene fragments (Figure 4 and Supplementary Figures 2–4) and the abnormal mutation rate and selection pressure of rNDH-1 genes (Figure 5). It has been reported that Chlorophyceae green algae frequently meet with various environmental challenges, such as fluctuations in nutrient, light availability, and temperature, in their natural habitat (Varshney et al., 2015). Consistent with this situation, the chloroplast DNA and mitochondrial DNA of Chlorophyceae underwent substantial changes in their architecture (such as gene losses and genome expansion in the case of mitochondrial DNA) during evolution (Turmel et al., 2002; Wodniok et al., 2011). Under this background, it is reasonable to infer that these conserved pNDH-1 genes of Chlorophyceae are lost in chloroplast and are transferred to the mitochondrial genome.

Compared with the land plants, Bryophyta and Pteridophyte, the trees in Pinaceae grow quite high (Graham et al., 1995), implying that they have an efficient photosynthesis and produce more O₂. Consistent with the hypothesis, Pinaceae underwent an O₂-rise phase (Savard et al., 1994; Berner, 2006) and may produce abundant ROS in chloroplast but less ROS in mitochondria under environmental stresses (Foyer and Noctor, 2003; Laloi et al., 2004; Zhao et al., 2020). As a consequence, it appears plausible that pNDH-1 genes lost in Pinaceae are transferred from O₂-enriched chloroplast to the O₂-less mitochondria as oxygen-consuming organelle.

Based on the aforementioned analysis, we propose that translocation of pNDH-1 genes from chloroplast genome to the nucleus genome or mitochondrial genome is important to maintain the architecture and household function of pNDH-1 during evolution. As a consequence, the function of pNDH-1 as an important antioxidant mechanism can reduce ROS production necessary for the survival of eukaryotic photosynthetic organisms in aerobic environment.

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