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Exon Recombination02:32

Exon Recombination

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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
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Phylum Ascomycota, a major division within the subkingdom Dikarya, comprises a diverse range of fungal species, including both unicellular yeasts and filamentous molds such as Aspergillus and Penicillium. These fungi thrive in a variety of habitats, from aquatic ecosystems to terrestrial environments, playing crucial ecological and economic roles.Morphology and ReproductionThe defining characteristic of Ascomycetes, commonly referred to as sac fungi, is the ascus—a sac-like structure that...
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Updated: Mar 10, 2026

RNAi-mediated Control of Aflatoxins in Peanut: Method to Analyze Mycotoxin Production and Transgene Expression in the Peanut/Aspergillus Pathosystem
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Targeting Aflatoxin Biosynthetic Genes.

Ali Y Srour1, Ahmad M Fakhoury1, Robert L Brown2

  • 1Department of Plant Soil and Agriculture Systems, Southern Illinois University, Carbondale, IL, USA.

Methods in Molecular Biology (Clifton, N.J.)
|December 8, 2016
PubMed
Summary

Preventing aflatoxins in food is crucial. Early detection of aflatoxin-producing fungi, like Aspergillus and Penicillium, is now more reliable using PCR-based methods targeting mycotoxin genes.

Keywords:
AflatoxinsAspergillusBiosynthesisFungiMycotoxinsPCRPenicilliumqPCR

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Area of Science:

  • Food safety and mycology.
  • Microbial detection and identification.

Background:

  • Chemical detoxification of aflatoxins often compromises food edibility.
  • Preventing aflatoxins from entering the food chain is a more effective strategy.
  • Accurate detection of aflatoxin-producing fungi is essential for prevention.

Purpose of the Study:

  • To present protocols for detecting and quantifying aflatoxin-producing fungi.
  • To leverage advances in fungal taxonomy and molecular methods for improved detection.

Main Methods:

  • Utilizing Polymerase Chain Reaction (PCR)-based approaches.
  • Targeting mycotoxin biosynthesis pathway genes for fungal identification.
  • Addressing challenges in classifying morphologically similar fungal species.

Main Results:

  • PCR-based methods offer a practical, rapid, and reliable alternative to traditional culture-based techniques.
  • Advances in sequencing and genome assembly facilitate species-level fungal identification.
  • The presented protocols enable precise detection and quantification of target fungi.

Conclusions:

  • PCR-based detection of mycotoxin biosynthesis genes is superior for identifying aflatoxin-producing fungi.
  • This approach enhances food safety by enabling early detection and prevention.
  • Molecular methods overcome limitations of traditional fungal classification.