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Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
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Development of the reproductive organs in an embryo starts from a bipotential state. This means the early embryo can develop either male or female reproductive organs. The formation of these organs begins with the growth of gonadal ridges that arise from the intermediate mesoderm during the fifth week of development.
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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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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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Spatial Genome Organization: From Development to Disease.

Aishwarya Sivakumar1, Jose I de Las Heras1, Eric C Schirmer1

  • 1Wellcome Centre for Cell Biology, University of Edinburgh, Edinburgh, United Kingdom.

Frontiers in Cell and Developmental Biology
|April 6, 2019
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Summary

This review explores genome organization across life, detailing DNA packaging, higher-order structures like topologically associating domains (TADs), and their role in development and disease.

Keywords:
CTCFLADTADcohesindevelopmentgenome organization

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Organisms possess DNA encoding genes, with genome organization observed for over a century.
  • Technological advancements like Hi-C have significantly aided understanding of genome structure.
  • Conserved evolutionary mechanisms govern genome organization, involving proteins like histones and architectural factors.

Purpose of the Study:

  • To review the principles of genome organization hierarchically.
  • To discuss the dynamics of genome organization during development.
  • To examine the role of genome architecture in cell fate and human disease.

Main Methods:

  • Review of existing literature and research.
  • Analysis of techniques including electron microscopy, FISH, DamID, and Hi-C.
  • Examination of conserved and diversified protein functions in genome structuring.

Main Results:

  • Genome organization follows hierarchical principles, from DNA packaging to higher-order structures like TADs.
  • Genomic locus radial positioning is significant.
  • Genome architecture dynamics are crucial during development and cell fate determination.

Conclusions:

  • Understanding genome organization is key to comprehending biological processes.
  • Misregulation of genome architecture is implicated in human diseases.
  • Further research into genome dynamics can reveal novel therapeutic targets.