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Related Concept Videos

Mutations01:35

Mutations

39.5K
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
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Leaky Scanning02:28

Leaky Scanning

5.2K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

121
Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
121
Initiation of Translation02:33

Initiation of Translation

34.4K
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
34.4K
Point and Frameshift Mutations01:30

Point and Frameshift Mutations

70
Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...
70
Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

10.8K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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Implementation of In Vitro Drug Resistance Assays: Maximizing the Potential for Uncovering Clinically Relevant Resistance Mechanisms
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Using Machine Learning for Predicting the Effect of Mutations in the Initiation Codon.

J Castell-Diaz, F Abad-Navarro, M E de la Morena-Barrio

    IEEE Journal of Biomedical and Health Informatics
    |August 23, 2022
    PubMed
    Summary
    This summary is machine-generated.

    Predicting mutations in the translation initiation codon is crucial as they can prevent protein generation. A new biological model and machine learning approach accurately identifies deleterious or benign mutations at this critical site.

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    Area of Science:

    • Genetics
    • Bioinformatics
    • Molecular Biology

    Background:

    • Traditional mutation effect prediction focuses on amino acid substitutions.
    • This approach is insufficient for mutations in translation initiation codons, which can halt protein synthesis.
    • Specific predictive methods are required for initiation codon mutations.

    Purpose of the Study:

    • To develop a novel method for predicting the effects of mutations in the canonical translation initiation codon.
    • To create a predictor that utilizes a biological model incorporating mutation-specific features.

    Main Methods:

    • Developed a predictor using tree-based machine learning algorithms.
    • Utilized data extracted from Ensembl for model training.
    • Incorporated biological features, including distance to alternative initiation codons.

    Main Results:

    • The developed model accurately detects deleterious or benign mutations in the canonical translation initiation codon.
    • Achieved a precision of 44.28% and an accuracy of 98.32%.
    • Outperforms existing state-of-the-art tools like PolyPhen, SIFT, and CADD for initiation codon mutations.

    Conclusions:

    • The proposed method offers improved prediction of mutation effects at the translation initiation codon.
    • This biological model-based approach addresses a critical gap in mutation effect prediction.
    • The findings enhance the understanding and prediction of genetic variations impacting protein synthesis initiation.