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Related Concept Videos

Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

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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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Genomics02:02

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Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
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Genome Annotation and Assembly03:36

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The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
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Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
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The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
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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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Updated: Jun 27, 2025

Optimization and Comparative Analysis of Plant Organellar DNA Enrichment Methods Suitable for Next-generation Sequencing
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Technological Development and Advances for Constructing and Analyzing Plant Pangenomes.

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Pangenomes reveal species

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Area of Science:

  • Genomics
  • Bioinformatics
  • Population Genetics

Background:

  • Pangenomes represent the complete set of genes for a species, encompassing genetic diversity.
  • Sequencing technology advances have enabled sophisticated pangenome construction and analysis.

Purpose of the Study:

  • To review and compare primary methods for pangenome construction and analysis.
  • To highlight the emerging role of graph-based pangenomes in exploring genetic variations.

Main Methods:

  • De novo assembly and comparison
  • Reference genome-based iterative assembly
  • Graph-based pangenome construction

Main Results:

  • Each method has distinct advantages and challenges for handling diverse DNA sequencing data.
  • Graph-based pangenomes offer an advanced reference framework.

Conclusions:

  • Graph-based pangenomes are increasingly important for understanding the biological and functional impact of genetic variations.
  • High-quality genome assemblies and advanced bioinformatics tools facilitate graph-based pangenome analysis.