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Genome Annotation and Assembly03:36

Genome Annotation and Assembly

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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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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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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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Hybrid De Novo Genome Assembly for the Generation of Complete Genomes of Urinary Bacteria using Short- and Long-read Sequencing Technologies
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The AssemblX Toolkit for Reliable and User-Friendly Multigene Assemblies.

Fabian Machens1, Lena Hochrein2

  • 1Department of Molecular Biology, University of Potsdam, Potsdam, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|August 19, 2020
PubMed
Summary
This summary is machine-generated.

The AssemblX toolkit simplifies complex DNA construct assembly for biotechnology and synthetic biology. This software-assisted approach enables users to design, build, and test large genetic circuits efficiently.

Keywords:
CloningDNA assemblyMultipartPathway assemblySequence independentSoftware-assisted

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Area of Science:

  • Biotechnology
  • Synthetic Biology
  • Molecular Biology

Background:

  • Complex DNA construct assembly for biological pathways and genetic circuits is challenging, costly, and time-consuming.
  • Existing methods often require extensive parts domestication and are not suitable for inexperienced users.

Purpose of the Study:

  • To develop a software-assisted toolkit, AssemblX, for simplified design, construction, and testing of large DNA constructs.
  • To enable users, including those with limited experience, to assemble complex biological systems.

Main Methods:

  • AssemblX employs overlap-based, scar-free, and sequence-independent cloning for initial assembly of functional units.
  • Utilizes rare cutting homing endonucleases and optimized overlap sequences for standardized, PCR-free assembly into multigene modules.
  • Incorporates selection and marker switching strategies for process efficiency.

Main Results:

  • AssemblX facilitates the assembly of up to 25 functional units from over 75 subunits.
  • The toolkit allows unrestricted gene-level design without laborious parts domestication.
  • Enables virtually sequence-independent assembly into multigene modules.

Conclusions:

  • The AssemblX toolkit significantly overcomes challenges in assembling large DNA constructs for synthetic biology and biotechnology.
  • It provides an efficient, user-friendly solution for designing and building complex genetic circuits.
  • Facilitates transfer of assembly products to various expression hosts.