Paralogs
Paralogs - Related Videos
01:57
Gene Families
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2020
Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate. Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
02:47
Protein Families
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2020
Protein families are groups of homologous proteins; that is, they have similarities in amino acid sequences and three-dimensional structures. Protein families usually occur because of gene duplication, where an additional copy of a gene is inserted into the genome of an organism. Mutations that change the amino acids but still allow the protein to be properly synthesized, will lead to new protein family members. If these new proteins contain similar amino acids in key locations, protein...
08:35
In Situ Immunofluorescent Staining of Autophagy in Muscle Stem Cells
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Cited by 2 •
2017
Active autophagy is associated with productive muscle regeneration, which is essential for Muscle Stem Cell (MuSC) activation. Here, we provide a protocol for the in situ detection of LC3, an autophagy marker in MyoD-positive MuSCs of muscle tissue sections from control and injured mice.
FAQs
The evolutionary outcome depends on how each copy changes after duplication. One paralog may preserve the ancestral function, while the pair may divide that function between them or one copy may develop a new function. Comparing their sequences and structures helps identify these changes and shows how duplication can increase functional complexity within biological pathways.
Similar protein sequences do not necessarily mean that paralogs operate in the same biological contexts. Differences in regulatory regions can produce distinct expression patterns, causing each copy to be active in different circumstances. Examining regulation alongside sequence and structure therefore helps explain functional specialization and reveals how gene duplicates contribute to complex biological systems.
Genetic redundancy occurs when related copies retain overlapping functions, so one paralog may partially compensate for changes affecting another. Studying this overlap helps researchers determine whether duplicated genes preserve the ancestral role or have diverged. It also clarifies how organisms can maintain pathway activity while individual gene copies accumulate functional or regulatory differences.
The key analytical distinction is the evolutionary setting of the copies being compared. Paralogs are examined as duplicated gene relationships within an organism, whereas orthologs reflect divergence between species. This distinction matters because sequence similarity alone cannot establish the relationship; researchers must interpret similarity alongside the species context and the history of gene duplication.
A useful comparison combines several evidence types rather than relying on sequence alone. Researchers examine paralog sequences, protein structures, regulatory regions, and expression profiles to assess similarity and divergence. Together, these data can indicate whether copies retain overlapping roles, divide an ancestral function, or show changes associated with new functions and expression patterns.
Paralog analysis can reveal how related gene copies contribute differently to biological pathways, including cases where altered function or regulation may influence disease mechanisms. Mapping their distinct or overlapping roles helps researchers identify which copy is most relevant to a disease process. That information can also guide investigation of potential therapeutic targets without assuming that all family members have identical effects.