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Related Concept Videos

Cell Specific Gene Expression01:58

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
Cell Specific Gene Expression01:58

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
Diencephalon: Thalamus and Information Relay01:27

Diencephalon: Thalamus and Information Relay

The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological states or needs.
Diencephalon: Anatomical Regions01:30

Diencephalon: Anatomical Regions

The diencephalon, etymologically translated as 'through brain,' plays an integral role as the conduit between the cerebrum and the vast extent of the nervous system. However, the olfactory system is an exception, as it interfaces directly with the cerebrum. The diencephalon, deeply ensconced beneath the cerebrum, primarily consists of three paired structures — the thalamus, hypothalamus, and epithelamus. It also includes accessory structures such as the subthalamus, which houses the subthalamic...
General Transcription Factors01:30

General Transcription Factors

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...
Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the timing and level of...

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Nucleus- and cell-specific gene expression in monkey thalamus.

Karl D Murray1, Prabhakara V Choudary, Edward G Jones

  • 1Center for Neuroscience and Department of Psychiatry and Behavioral Sciences, University of California, Davis, CA 95616, USA.

Proceedings of the National Academy of Sciences of the United States of America
|January 31, 2007
PubMed
Summary

Researchers identified specific genes in the mammalian thalamus, revealing molecular factors that determine the unique organization and connectivity of its nuclei. These findings shed light on thalamic development and function.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genomics

Background:

  • Mammalian thalamic nuclei have distinct structures and connections, but the molecular basis for this specificity is unknown.
  • Understanding these determinants is crucial for comprehending thalamic organization and function.

Purpose of the Study:

  • To identify molecular determinants underlying the organizational specificity of mammalian thalamic nuclei.
  • To compare gene expression profiles between the thalamus and cerebral cortex to find nucleus-specific transcripts.

Main Methods:

  • Comparative gene expression profiling of adult rhesus monkey thalamus and cerebral cortex.
  • Real-time quantitative PCR and in situ hybridization for validation.
  • Expression profiling of microdissected individual thalamic nuclei.

Main Results:

  • Identified transcripts specific to the dorsal thalamus and individual thalamic nuclei.
  • Functional annotation revealed overrepresentation of genes related to development, morphogenesis, cell-cell interactions, and extracellular matrix, many in the Wnt signaling pathway.
  • Specific genes like TCF7L2, PCP4, SPP1, SPARC, and CBLN1 were identified with roles in neuronal specification, axon outgrowth, and synaptogenesis.

Conclusions:

  • The identified genes are likely critical for specifying thalamic nuclei, cell phenotypes, and connectivity during development.
  • These molecular mechanisms are maintained in the adult thalamus, contributing to its organizational specificity.