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Genes and Small RNA Transcripts Exhibit Dosage-Dependent Expression Pattern in Maize Copy-Number Alterations.

Tao Zuo1, Jianbo Zhang1, Andrew Lithio2

  • 1Department of Genetics, Development and Cell Biology, Department of Agronomy, Iowa State University, Ames, Iowa 50011.

Genetics
|May 1, 2016
PubMed
Summary

Maize gene copy number changes impact plant traits and gene expression. Most genes and small RNAs in duplicated segments show dosage-dependent transcript levels, revealing key genome regulation insights.

Keywords:
copy-number alterationsdosage effectmaizephenotypic variationssmall RNAs

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Area of Science:

  • Genomics
  • Plant Biology
  • Gene Regulation

Background:

  • Copy-number alterations (CNAs) are common in genomes, but their effect on gene expression is not fully understood.
  • In plants, small duplications (<100 kb) often show dosage effects, while large ones (>50 Mb) tend to be dosage compensated.
  • The impact of moderate-sized (1-50 Mb) segmental duplications and small RNA responses to dosage changes remain largely unknown.

Purpose of the Study:

  • To investigate the impact of segmental duplications on gene expression and small RNA levels in maize (Zea mays).
  • To analyze dosage effects in moderately-sized duplications (1-50 Mb) and their influence on plant phenotypes.

Main Methods:

  • Created maize plants with varying doses (2, 3, and 4) of a 14.6-Mb chromosome segment.
  • Utilized GeneChip and RNA-sequencing for transcriptome analysis.
  • Assessed phenotypic changes in ear length and flowering time.

Main Results:

  • Plants with duplicated segments showed dosage-dependent effects on ear length and flowering time.
  • Most genes and unique small RNAs within the duplicated segments exhibited dosage-dependent transcript levels.
  • This study is the first to analyze small RNA expression in plant gene dosage variants.

Conclusions:

  • Dosage effect is the primary regulatory response for both genes and small RNA transcripts in the tested segmental dosage series.
  • Findings offer crucial insights into gene and small RNA regulation in response to dosage changes in eukaryotic genomes.
  • Segmental duplications play a significant role in genome regulation and evolution.