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Epistasis01:39

Epistasis

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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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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Related Experiment Video

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A Noninvasive Hair Sampling Technique to Obtain High Quality DNA from Elusive Small Mammals
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Decoding cilia function: defining specialized genes required for compartmentalized cilia biogenesis.

Tomer Avidor-Reiss1, Andreia M Maer, Edmund Koundakjian

  • 1Howard Hughes Medical Institute and Division of Biological Sciences and Department of Neurosciences, University of California at San Diego, La Jolla, CA 92093, USA.

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Summary

Researchers identified ~200 genes crucial for cilia function, including novel outer segment proteins (OSEGs), essential for ciliogenesis and specialized transport in eukaryotes. This discovery aids understanding of cilia evolution and function.

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Area of Science:

  • Cell Biology
  • Evolutionary Biology
  • Genomics

Background:

  • The eukaryotic flagellum (cilium) is a vital organelle for motility and sensory functions in many eukaryotes, but dispensable in others.
  • Understanding the genetic basis of cilia formation and function is key to deciphering their diverse roles.

Purpose of the Study:

  • To identify genes essential for cilia formation and function using comparative genomics.
  • To characterize novel protein families involved in ciliogenesis.

Main Methods:

  • Comparative genomic analysis of organisms with and without cilia.
  • Functional characterization of novel genes in the model organism Drosophila.

Main Results:

  • Identified approximately 200 conserved genes absent in nonciliated eukaryotes but present in ciliated ones, including over 80% of known ancestral ciliary proteins.
  • Characterized a novel family of outer segment proteins (OSEGs) essential for ciliogenesis in Drosophila.
  • Demonstrated that OSEGs form a specialized transport pathway unique to the ciliary compartment.

Conclusions:

  • Comparative genomics is effective for identifying core ciliary gene sets.
  • OSEGs represent a novel class of proteins critical for ciliary transport and formation.
  • This work provides insights into the evolution and specialized biology of cilia.