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Elements and Compounds01:27

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Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond.
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The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
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Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
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A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
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Conserved Noncoding Elements Influence the Transposable Element Landscape in Drosophila.

Manee M Manee1,2,3, John Jackson1,4, Casey M Bergman1,5,6

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Conserved noncoding elements (CNEs) reduce transposable element (TE) insertions, indicating selection shapes noncoding DNA. This suggests CNEs are functionally important, not just inactive genomic regions.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Highly conserved noncoding elements (CNEs) are abundant in eukaryotic genomes, but their functions are largely unknown.
  • Evidence suggests CNEs are under purifying selection, while transposable element (TE) insertions are common in noncoding regions.
  • It remains unclear if TE insertion patterns in noncoding DNA are influenced by selection acting on CNEs.

Purpose of the Study:

  • To investigate whether the distribution of TE insertions in noncoding regions is random or influenced by purifying selection on CNEs.
  • To analyze the impact of selective constraints on CNEs on the landscape of TE insertions in eukaryotic genomes.

Main Methods:

  • Utilized comparative and population genomic data from Drosophila melanogaster.
  • Analyzed the abundance and allele frequency spectra of TE insertions in CNEs versus unconstrained regions.

Main Results:

  • Demonstrated a reduced abundance of TE insertions in intronic and intergenic CNEs compared to random expectations.
  • Found no significant differences in allele frequency spectra for polymorphic TE insertions between CNEs and spacer regions.
  • Provided evidence that selective constraints on CNEs actively eliminate a proportion of TE insertions.

Conclusions:

  • Selective constraints on CNEs play a role in shaping the landscape of TE insertions in eukaryotic genomes.
  • CNEs are functionally constrained elements, refuting the hypothesis that they are merely mutational cold spots.