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Point and Frameshift Mutations

Point and Frameshift Mutations

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...

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Severity Ranking of Missense and Frameshift Genetic Variants in SCD1 by In Silico and In Vitro Functional Analysis.

Hanna K Susán¹, Gabriella Orosz¹, Veronika Zámbó¹

¹Department of Molecular Biology, Semmelweis University, H-1085 Budapest, Hungary.

|October 16, 2024

Summary

Genetic mutations in stearoyl-CoA desaturase-1 (SCD1) impact lipid metabolism. While some mutations like p.R253AfsTer7 are highly detrimental, others like p.M224L show no adverse effects, highlighting the need for functional characterization.

Keywords:

desaturase genetic variation lipid metabolism lipotoxicity missense and frameshift mutations structural prediction

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Area of Science:

Biochemistry
Genetics
Molecular Biology

Background:

Excess dietary intake can cause lipid metabolism imbalances.
Stearoyl-CoA desaturase-1 (SCD1) is crucial for fatty acid desaturation and has a protective role.
SCD1 expression is regulated by multiple mechanisms, and human genome variations can influence it.

Purpose of the Study:

To investigate the impact of natural missense or frameshift mutations in SCD1 on enzyme expression, degradation, and function.
To establish a risk or severity ranking for identified SCD1 variants.

Main Methods:

In silico analysis of genetic variations.
In vitro experiments to assess SCD1 variant effects.
Evaluation of structural, functional, and quantitative impacts of mutations.

Main Results:

The p.R253AfsTer7 variant was the most deleterious across structural, functional, and quantitative assessments.
The p.H125P variant impaired desaturation capacity, increased degradation due to folding issues, and destabilized mRNA.
The p.A333T variant showed an intermediate phenotype, while p.M224L had no adverse effects and increased SCD1 levels.

Conclusions:

Functional characterization of genetic variations is essential for personalized medicine.
Understanding SCD1 variant impacts aids in preventing and treating lipid metabolism disorders.