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Actin Polymerization and Cell Motility01:13

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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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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.
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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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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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Related Experiment Video

Updated: Aug 28, 2025

Targeted Next-generation Sequencing and Bioinformatics Pipeline to Evaluate Genetic Determinants of Constitutional Disease
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Mutation update for the ACTN2 gene.

Johanna Ranta-Aho1,2, Montse Olive3,4,5, Marie Vandroux6

  • 1Folkhälsan Research Center, Helsinki, Finland.

Human Mutation
|September 18, 2022
PubMed
Summary

Mutations in ACTN2, encoding alpha-actinin-2, are increasingly linked to myopathies affecting both cardiac and skeletal muscles. Further research is needed to clarify genotype-phenotype correlations for these muscle diseases.

Keywords:
ACTN2alpha-actinin-2cardiomyopathycongenital myopathydistal myopathy

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Area of Science:

  • Muscle physiology and genetics
  • Sarcomere structure and function
  • Human molecular genetics

Background:

  • ACTN2 encodes alpha-actinin-2, a key structural protein in the sarcomere Z-disk of cardiac and skeletal muscle.
  • Previously, ACTN2 mutations were linked exclusively to cardiomyopathy, but recent findings associate them with congenital and distal myopathies.
  • The distribution of pathogenic ACTN2 variants and their genotype-phenotype correlations are not fully understood.

Conclusions:

  • ACTN2 plays a central role in muscle tissue, and its mutations are implicated in various myopathies.
  • Most reported missense variants lack sufficient segregation and functional data to confirm pathogenicity.
  • Clear genotype-phenotype correlations are established for only a subset of ACTN2-related myopathies, necessitating further investigation.