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Related Concept Videos

Pleiotropy01:33

Pleiotropy

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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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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
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Related Experiment Video

Updated: Sep 19, 2025

Multiplexed Analysis of Retinal Gene Expression and Chromatin Accessibility Using scRNA-Seq and scATAC-Seq
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SOX2-VSX2 Co-Occupancy Shapes Retinal Neurogenesis Through Dynamic Chromatin Regulation.

Fuyun Bian1, Kimiasadat Golestaneh1, Emily Davis1

  • 1Department of Ophthalmology, Discovery Institute, University of Pittsburgh School of Medicine, Pittsburgh.

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|June 6, 2025
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Summary

SOX2 and VSX2 transcription factors cooperate to control retinal progenitor cell gene expression, guiding neural development and preventing alternative cell fates during retinogenesis.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Neuroscience

Background:

  • Retinal neurogenesis relies on a complex gene regulatory network (GRN) involving transcription factors (TFs) in retinal progenitor cells (RPCs).
  • The precise mechanisms by which GRNs establish neural competence in RPCs are not fully understood.

Purpose of the Study:

  • To investigate the regulatory mechanisms of SOX2, a crucial TF for neural identity in RPCs.
  • To elucidate how SOX2 and its partners guide retinogenesis and chromatin accessibility.

Main Methods:

  • Integrated transcriptional, genetic, and genomic analyses were employed.
  • SOX2 enrichment in RPC-specific enhancers was examined.
  • VSX2 was identified as a SOX2 binding partner.

Main Results:

  • SOX2 is enriched in enhancers regulating retinogenesis and its disruption impairs neurogenesis.
  • SOX2 and VSX2 co-target retinal-specific chromatin, enhancing TF binding and accessibility.
  • This cooperative binding promotes neurogenesis regulators and represses alternative cell fates.

Conclusions:

  • SOX2 and VSX2 establish a transcriptional code essential for retinal neural identity.
  • Cooperative TF action on chromatin drives genetic programs underlying neurogenesis.
  • This study provides fundamental insights into the regulation of retinal development.