An Exome-seq Based Tool for Mapping and Selection of Candidate Genes in Maize Deletion Mutants.
10.1016/j.gpb.2018.02.003
- Author:
Shangang JIA
1
;
Kyla MORTON
1
;
Chi ZHANG
2
;
David HOLDING
3
Author Information
1. Department of Agronomy and Horticulture, Center for Plant Science Innovation, Beadle Center for Biotechnology, University of Nebraska, Lincoln, NE 68588, USA.
2. School of Biological Sciences, Center for Plant Science Innovation, Beadle Center for Biotechnology, University of Nebraska, Lincoln, NE 68588, USA.
3. Department of Agronomy and Horticulture, Center for Plant Science Innovation, Beadle Center for Biotechnology, University of Nebraska, Lincoln, NE 68588, USA. Electronic address: dholding2@unl.edu.
- Publication Type:Journal Article
- Keywords:
Bulked segregation analysis;
Exome-seq;
Maize functional genomics;
Mapping-by-sequencing;
Opaque mutant
- MeSH:
Chromosome Mapping;
methods;
DNA, Plant;
genetics;
DNA-Binding Proteins;
genetics;
Endosperm;
Exome;
genetics;
Exons;
genetics;
Gene Deletion;
Genomics;
Phenotype;
Plant Proteins;
genetics;
Sequence Analysis, DNA;
methods;
Transcription Factors;
genetics;
Zea mays;
genetics
- From:
Genomics, Proteomics & Bioinformatics
2018;16(6):439-450
- CountryChina
- Language:English
-
Abstract:
Despite the large number of genomic and transcriptomic resources in maize, there is still much to learn about the function of genes in developmental and biochemical processes. Some maize mutants that were generated by gamma-irradiation showed clear segregation for the kernel phenotypes in B73 × Mo17 F2 ears. To better understand the functional genomics of kernel development, we developed a mapping and gene identification pipeline, bulked segregant exome sequencing (BSEx-seq), to map mutants with kernel phenotypes including opaque endosperm and reduced kernel size. BSEx-seq generates and compares the sequence of the exon fraction from mutant and normal plant F2 DNA pools. The comparison can derive mapping peaks, identify deletions within the mapping peak, and suggest candidate genes within the deleted regions. We then used the public kernel-specific expression data to narrow down the list of candidate genes/mutations and identified deletions ranging from several kb to more than 1 Mb. A full deletion allele of the Opaque-2 gene was identified in mutant 531, which occurs within a ∼200-kb deletion. Opaque mutant 1486 has a 6248-bp deletion in the mapping interval containing two candidate genes encoding RNA-directed DNA methylation 4 (RdDM4) and AMP-binding protein, respectively. This study demonstrates the efficiency and cost-effectiveness of BSEx-seq for causal mutation mapping and candidate gene selection, providing a new option in mapping-by-sequencing for maize functional genomics studies.
