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Related Concept Videos

Exon Recombination02:32

Exon Recombination

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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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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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Pleiotropy01:33

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Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
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Updated: Jul 2, 2025

A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations
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[The foetal exome revealed].

Bertrand Jordan1

  • 1Biologiste, généticien et immunologiste, Président d'Aprogène (Association pour la promotion de la Génomique), 13007 Marseille, France.

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|February 27, 2024
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Summary
This summary is machine-generated.

New prenatal diagnostics can now fully analyze the fetal exome using maternal cell-free DNA. This advancement expands diagnostic capabilities but introduces complex ethical considerations for expectant parents.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Bioethics

Context:

  • Advancements in next-generation sequencing technologies.
  • Increasing use of non-invasive prenatal testing (NIPT).
  • Growing understanding of fetal genetics through circulating cell-free DNA (cfDNA).

Purpose:

  • To explore the implications of complete fetal exome analysis from maternal cfDNA.
  • To highlight the expanded scope of prenatal diagnostics.
  • To address the emerging ethical challenges associated with comprehensive fetal genetic information.

Summary:

  • Maternal cell-free DNA (cfDNA) analysis has evolved to enable complete sequencing of the fetal exome.
  • This breakthrough significantly broadens the possibilities for prenatal diagnosis.
  • The capability for exome-wide fetal genetic analysis presents novel ethical dilemmas.

Impact:

  • Potential to detect a wider range of genetic conditions prenatally.
  • Necessitates development of ethical guidelines for comprehensive fetal genetic testing.
  • Requires enhanced genetic counseling for expectant parents regarding incidental findings.