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Related Experiment Videos

Evolutionary breakpoints on human chromosome 21.

M T Davisson1, L J Bechtel, E C Akeson

  • 1The Jackson Laboratory, Bar Harbor, Maine 04609, USA. mtd@jax.org

Genomics
|November 15, 2001
PubMed
Summary
This summary is machine-generated.

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Researchers mapped conserved gene segments between human chromosome 21 and mouse chromosomes. This refines understanding of mouse models for Down syndrome by identifying gene locations and evolutionary breakpoints.

Area of Science:

  • Genomics
  • Comparative genomics
  • Mammalian genetics

Background:

  • Human chromosome 21 (HSA21) contains genes relevant to Down syndrome.
  • Conserved syntenic segments exist between HSA21 and mouse chromosomes, aiding in the creation of Down syndrome models.
  • Previous mapping efforts identified limited orthologous genes in mouse chromosomes.

Purpose of the Study:

  • To precisely define the conserved genomic region on mouse chromosomes homologous to human chromosome 21.
  • To identify the evolutionary breakpoints between mouse chromosomes 16, 17, and 10.
  • To refine the gene content of the mouse chromosome 17 segment for improved Down syndrome modeling.

Main Methods:

  • Utilized mouse radiation hybrid panel mapping to determine gene locations.

Related Experiment Videos

  • Employed comparative genomic sequence analysis between mouse and human genomes.
  • Integrated physical mapping data with sequence comparisons.

    • Main Results:

    • Mapped the chromosomal locations of 12 additional genes and predicted locations for 7 more.
    • Defined the specific endpoints of the conserved region on mouse chromosome 17.
    • Identified the evolutionary breakpoint between mouse chromosomes 16 and 17 between human genes ZNF295 and UMODL1.
    • Suggested a duplication event involving the PDXK gene at the chromosome 17/10 breakpoint.
    • Estimated the functional gene count in the mouse chromosome 17 segment to be approximately 21.

    Conclusions:

    • Detailed mapping of conserved syntenic regions refines the gene content of mouse chromosome 17.
    • Identification of evolutionary breakpoints clarifies inter-chromosomal rearrangements.
    • This enhanced understanding is crucial for developing accurate mouse models of Down syndrome.