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Evolutionary Relationships through Genome Comparisons02:54

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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Related Experiment Video

Updated: May 27, 2025

Annotation of Plant Gene Function via Combined Genomics, Metabolomics and Informatics
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Comprehensive Codon Usage Analysis Across Diverse Plant Lineages.

Aasim Majeed1, Vikas Sharma1, Wahid Ul Rehman1

  • 1Molecular Genetics Laboratory, Department of Botany, Central University of Punjab, VPO Ghudda, Distt. Bathinda, Punjab, 151401, India.

Biochemical Genetics
|February 18, 2025
PubMed
Summary
This summary is machine-generated.

Plant evolution shows distinct codon usage patterns. Vascularization, not seed production, correlates with changes in optimal codons, influenced more by mutational pressure in non-vascular plants.

Keywords:
Codon usage biasDinucleotide biasMutationNatural selectionOptimal codonsRSCUSeed productionVascularization

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genomics

Background:

  • Codon usage patterns vary across organisms, reflecting evolutionary adaptations.
  • Understanding these patterns provides insights into genomic evolution and selective pressures.

Purpose of the Study:

  • To investigate the relationship between plant evolutionary events (vascularization, seed production) and codon usage patterns.
  • To determine whether natural selection or mutational pressure predominantly shapes codon bias in different plant lineages.

Main Methods:

  • Analysis of codon usage patterns in various plant lineages.
  • Application of correspondence analysis and model-based clustering.
  • Assessment of dinucleotide frequencies and their representation.

Main Results:

  • Optimal codons differ between non-vascular (GC-ending) and vascular (AU-ending) plant lineages.
  • Codon usage evolution aligns more closely with vascularization than seed production.
  • CpG and TpA dinucleotides are under-represented; TpG is over-represented (except in algae).
  • Mutational pressure has a greater influence on non-vascular lineages compared to vascular ones.

Conclusions:

  • Vascularization is a key evolutionary event shaping codon usage bias in plants.
  • Both natural selection and mutational pressure influence codon usage, with varying relative importance across lineages.
  • Dinucleotide composition provides further clues into evolutionary constraints on plant genomes.