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Genetically modified soybean lines exhibit less transcriptomic variation compared to natural varieties.

Yan Long1, Wentao Xu2, Caiyue Liu1

  • 1Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China.

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|July 16, 2023
PubMed
Summary

Genetically modified (GM) soybeans show minimal transcriptomic changes compared to natural variations. RNA sequencing reveals transgenes do not cause massive gene expression alterations in soybean seed tissues.

Keywords:
Differentially expressed genesGM soybean linesnon-GM soybean linessoybean seed tissuestranscriptomic analysis

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Area of Science:

  • Plant Biotechnology
  • Genomics
  • Molecular Biology

Background:

  • Genetically modified (GM) soybeans are crucial for food and feed, but transgenesis raises food safety concerns.
  • Evaluating unintended effects of foreign genes is essential for assessing GM crop safety.
  • High-throughput sequencing offers a direct method to assess transcriptomic alterations.

Purpose of the Study:

  • To evaluate unintended transcriptomic effects in GM soybeans using RNA sequencing.
  • To compare gene expression profiles in specific soybean tissues (cotyledon, germ, hypocotyl, radicle) between GM and non-GM lines.
  • To provide empirical evidence on genomic-level disparities induced by genetic modification in soybeans.

Main Methods:

  • Transcriptomic analysis using RNA sequencing on four GM and three non-GM soybean lines.
  • Differential gene expression analysis in individual soybean tissues: cotyledon, germ, hypocotyl, and radicle.
  • Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses of differentially expressed genes (DEGs).

Main Results:

  • A total of 3,351 DEGs were identified among non-GM soybean lines.
  • Comparison between GM lines and their non-GM parents revealed 1,836 to 4,551 DEGs.
  • GO analysis showed more categories among non-GM lines (199) than between GM and non-GM varieties (166); KEGG pathway analysis showed similar results for both comparisons.

Conclusions:

  • Transgenes in soybeans do not appear to induce massive transcriptomic alterations when compared to natural variations.
  • RNA sequencing is effective for assessing gene expression differences in specific soybean tissues.
  • The study provides genomic-level data supporting the safety assessment of GM soybeans.