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Revised estimates of enterococcal chromosomal sizes

K V Singh1, B E Murray

  • 1Department of Internal Medicine, University of Texas Medical School at Houston 77030, USA.

DNA and Cell Biology
|November 1, 1994
PubMed
Summary
This summary is machine-generated.

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This study revises previous enterococci chromosomal size estimates, revealing significantly larger genome sizes for key strains. Accurate genome sizing is crucial for understanding bacterial genetics and evolution.

Area of Science:

  • Microbiology
  • Genomics

Background:

  • Previous estimates of enterococci chromosomal sizes were reported in the range of 2,045 to 2,761 kb.
  • The chromosomal size of Enterococcus faecalis strain OG1 was previously estimated between 2,750-2,761 kb.

Purpose of the Study:

  • To accurately determine the chromosomal sizes of enterococci strains.
  • To address underestimations in prior genome size measurements.

Main Methods:

  • Utilized variable electrophoresis conditions and additional DNA digestions for precise sizing.
  • Performed extensive analysis and mapping of enterococcal chromosomes.

Main Results:

  • Revised chromosomal size for Enterococcus faecalis strain OG1 is 2,825 kb.
  • New estimates for other strains: E. faecalis JH2-2 (2,852-3,093 kb), E. faecalis HH67 (2,910-3,065 kb), and E. faecium GE-1 (2,334-2,558 kb).

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  • Identified DNA shearing and fragment resolution issues as causes for earlier underestimations.

    • Conclusions:

    • The study provides corrected, larger chromosomal size estimates for enterococci strains.
    • Accurate genome sizing is essential for robust microbiological and genetic research.