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Conserved but attenuated parental gene expression in allopolyploids: constitutive zinc hyperaccumulation in the allotetraploidArabidopsis kamchatica
- Source :
- Molecular Biology and Evolution, 33 (11), Molecular Biology and Evolution
- Publication Year :
- 2016
-
Abstract
- Allopolyploidization combines parental genomes and often confers broader species distribution. However, little is known about parentally transmitted gene expression underlying quantitative traits following allopolyploidization because of the complexity of polyploid genomes. The allopolyploid species Arabidopsis kamchatica is a natural hybrid of the zinc hyperaccumulator Arabidopsis halleri and of the nonaccumulator Arabidopsis lyrata. We found that A. kamchatica retained the ability to hyperaccumulate zinc from A. halleri and grows in soils with both low and high metal content. Hyperaccumulation of zinc by A. kamchatica was reduced to about half of A. halleri, but is 10-fold greater than A. lyrata. Homeologs derived from A. halleri had significantly higher levels of expression of genes such as HEAVY METAL ATPASE4 (HMA4), METAL TRANSPORTER PROTEIN1 and other metal ion transporters than those derived from A. lyrata, which suggests cis-regulatory differences. A. kamchatica has on average about half the expression of these genes compared with A. halleri due to fixed heterozygosity inherent in allopolyploids. Zinc treatment significantly changed the ratios of expression of 1% of homeologous pairs, including genes putatively involved in metal homeostasis. Resequencing data showed a significant reduction in genetic diversity over a large genomic region (290 kb) surrounding the HMA4 locus derived from the A. halleri parent compared with the syntenic A. lyrata-derived region, which suggests different evolutionary histories. We also estimated that three A. halleri-derived HMA4 copies are present in A. kamchatica. Our findings support a transcriptomic model in which environment-related transcriptional patterns of both parents are conserved but attenuated in the allopolyploids.<br />Molecular Biology and Evolution, 33 (11)<br />ISSN:0737-4038<br />ISSN:1537-1719
- Subjects :
- 0301 basic medicine
Arabidopsis
Gene Dosage
Gene Expression
Locus (genetics)
10071 Functional Genomics Center Zurich
Quantitative trait locus
Genome
Polyploidy
UFSP13-7 Evolution in Action: From Genomes to Ecosystems
03 medical and health sciences
10127 Institute of Evolutionary Biology and Environmental Studies
Polyploid
10126 Department of Plant and Microbial Biology
1311 Genetics
Gene Expression Regulation, Plant
Genetics
1312 Molecular Biology
Homeostasis
Allopolyploid
Hyperaccumulator
Transcriptomics
Molecular Biology
Arabidopsis lyrata
Gene
Homeolog
Hyperaccumulation
Heavy metal
Selective sweep
Ecology, Evolution, Behavior and Systematics
Discoveries
Synteny
biology
Arabidopsis Proteins
Genetic Variation
Genomics
biology.organism_classification
Adaptation, Physiological
Zinc
030104 developmental biology
1105 Ecology, Evolution, Behavior and Systematics
570 Life sciences
590 Animals (Zoology)
Transcriptome
Subjects
Details
- Language :
- English
- ISSN :
- 07374038 and 15371719
- Database :
- OpenAIRE
- Journal :
- Molecular Biology and Evolution, 33 (11), Molecular Biology and Evolution
- Accession number :
- edsair.doi.dedup.....1a28ab0dc4558114ee70de155df29b7d