Related Experiment Video
Updated: Aug 3, 2026
13:16
Assessment of DNA Contamination in RNA Samples Based on Ribosomal DNA
Published on: January 22, 2018
DNA polymorphisms in new isolates of 'Deinococcus radiopugnans'
C I Masters1, R G Murray, B E Moseley
1Department of Pathology, F. E. Hébert School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814-4799.
Journal of General Microbiology
|July 1, 1991
Summary
Nineteen soil isolates, initially identified as Deinococcus radiopugnans, revealed significant genetic diversity. Restriction fragment length polymorphism (RFLP) analysis uncovered 17 distinct groups, challenging initial classifications.
Area of Science:
- Microbiology
- Genetics
- Environmental Science
Background:
- Deinococcus species are known for their radiation resistance and survival capabilities.
- Conventional identification methods suggested uniformity among new soil isolates.
- Preliminary enzyme activity tests hinted at underlying genetic heterogeneity.
Purpose of the Study:
- To investigate the genetic diversity within a collection of newly isolated Deinococcus strains.
- To determine if conventional criteria accurately reflect the genetic relatedness of these isolates.
- To explore the potential for hidden genetic variation within seemingly identical microbial populations.
Main Methods:
- Isolation of Deinococcus from soil samples near a UK lake.
- Characterization using conventional microbiological criteria.
- Detection of restriction enzyme activities.
- Restriction fragment length polymorphism (RFLP) analysis with multiple probes.
Main Results:
- All 19 isolates were initially identified as Deinococcus radiopugnans based on conventional methods.
- Three distinct restriction enzyme activities were observed in separate isolates.
- RFLP analysis revealed 17 genetically divergent groups among the 19 isolates.
- The observed diversity could not be explained by geographical origin or isolation method (UV selection).
Conclusions:
- Conventional identification methods are insufficient for distinguishing closely related Deinococcus strains.
- Significant genetic diversity exists within Deinococcus populations, even in geographically restricted samples.
- RFLP analysis is a powerful tool for uncovering cryptic genetic variation in microbial isolates.
Related Concept Videos
01:05Single Nucleotide Polymorphisms-SNPs
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
01:29Modern Molecular Taxonomy
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
01:18Other Unique Bacteria
Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...