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Related Concept Videos

Spindle Assembly02:50

Spindle Assembly

Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
Spindle Assembly02:50

Spindle Assembly

Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.

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AGORA: Assembly Guided by Optical Restriction Alignment.

Henry C Lin1, Steve Goldstein, Lee Mendelowitz

  • 1Center for Bioinformatics and Computational Biology, University of Maryland-College Park, College Park, MD, USA.

BMC Bioinformatics
|August 4, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces AGORA, a novel algorithm that integrates optical maps into genome assembly. AGORA improves genome reconstruction by resolving repeats and producing more complete and accurate assemblies.

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Area of Science:

  • Bioinformatics
  • Genomics
  • Computational Biology

Background:

  • Genome assembly is challenged by repetitive sequences, leading to fragmented contigs.
  • Long-range linking information is crucial for resolving repeats and achieving complete genome reconstruction.
  • Optical maps have been used for assembly validation but not directly within the assembly process.

Purpose of the Study:

  • To develop a novel algorithm that integrates optical map information directly into the de Bruijn graph genome assembly framework.
  • To improve the accuracy and completeness of genome assemblies by resolving ambiguities caused by repetitive sequences.

Main Methods:

  • Developed AGORA (Assembly Guided by Optical Restriction Alignment), a new algorithm utilizing optical map data within the de Bruijn graph paradigm.
  • Eliminated inconsistent paths in the de Bruijn graph based on optical map data.
  • Simulated assembly processes on bacterial genomes to evaluate algorithm performance.

Main Results:

  • AGORA is the first algorithm to use optical maps directly within the de Bruijn graph framework for genome assembly.
  • Simulations demonstrated AGORA's effectiveness in producing accurate assemblies closely matching reference sequences.
  • Identified that optical map noise and de Bruijn graph characteristics impact assembly quality, and enzyme choice can substantially improve results.

Conclusions:

  • Optical maps can be effectively integrated into the de Bruijn graph assembly framework for improved genome reconstruction.
  • Algorithm performance is influenced by optical map data characteristics, highlighting the potential of advanced optical mapping technologies.
  • Findings provide insights for optimizing optical mapping strategies and developing more accurate genome assembly tools.