Journal Article

Genome-wide identification and transcriptional analysis of folate metabolism-related genes in maize kernels

Guo, Wenzhu, Meng, Hongyan, Liang, Qiuju, Zhang, Chunyi, Chen, Maoran, Chen, Jinfeng, Lian, Tong, Xu, Bosi, Jiang, Ling, Li, Jinglai, Liu, Fang

2015

Overview

Background Maize is a major staple food crop globally and contains various concentrations of vitamins. Folates are essential water-soluble B-vitamins that play an important role as one-carbon (C1) donors and acceptors in organisms. To gain an understanding of folate metabolism in maize, we performed an intensive in silico analysis to screen for genes involved in folate metabolism using publicly available databases, followed by examination of the transcript expression patterns and profiling of the folate derivatives in the kernels of two maize inbred lines. Results A total of 36 candidate genes corresponding to 16 folate metabolism-related enzymes were identified. The maize genome contains all the enzymes required for folate and C1 metabolism, characterized by highly conserved functional domains across all the other species investigated. Phylogenetic analysis revealed that these enzymes in maize are conserved throughout evolution and have a high level of similarity with those in sorghum and millet. The LC-MS analyses of two maize inbred lines demonstrated that 5-methyltetrahydrofolate was the major form of folate derivative in young seeds, while 5-formyltetrahydrofolate in mature seeds. Most of the genes involved in folate and C1 metabolism exhibited similar transcriptional expression patterns between these two maize lines, with the highest transcript abundance detected on day after pollination (DAP) 6 and the decreased transcript abundance on DAP 12 and 18. Compared with the seeds on DAP 30, 5-methyltetrahydrofolate was decreased and 5-formyltetrahydrofolate was increased sharply in the mature dry seeds. Conclusions The enzymes involved in folate and C1 metabolism are conserved between maize and other plant species. Folate and C1 metabolism is active in young developing maize seeds at transcriptional levels.

• Publisher: BioMed Central,BioMed Central Ltd,Springer Nature B.V
• Subject: Agriculture / Ascomycota - physiology / Biochemistry, biophysics & molecular biology / Biochimie, biophysique & biologie moléculaire / Biomedical and Life Sciences / C1 metabolism / Corn / enzymes / Expression pattern / Folate metabolism / Folate profiling / Folic Acid / Folic Acid - metabolism / food crops / genes / Genome, Plant / Genomics and evolution / Life Sciences / liquid chromatography / Maize / mass spectrometry / millets / phylogeny / Plant Diseases / Plant Diseases - genetics / Plant Diseases - microbiology / Plant Proteins / Plant Proteins - genetics / Plant Proteins - metabolism / Plant Science / Plant Sciences / Plant species / Pollination / Quantitative Trait Loci / Research Article / Sciences du vivant / Seeds / staple foods / transcription (genetics) / Transcription, Genetic / Tree Biology / vitamin metabolism / Vitamins / Zea mays / Zea mays - genetics / Zea mays - metabolism / Zea mays - microbiology