Prokaryotic DNA: Location, Structure, and Function

Prokaryotic DNA is organized differently from eukaryotic DNA, with a single circular chromosome located in a region called the nucleoid and additional smaller DNA molecules called plasmids. This article explains where DNA is found in prokaryotic cells, how it is structured, and how these features affect molecular biology techniques used in diagnostic laboratories. The content is written for laboratory students, technicians, researchers, and diagnostic professionals who need a clear understanding of prokaryotic genome organization for practical applications such as nucleic acid extraction, amplification, and sequencing.

At a Glance: Prokaryotic versus Eukaryotic DNA Features

The table above summarizes the main differences that influence laboratory workflows. When you extract DNA from prokaryotic samples, you must account for the circular nature of the chromosome, the presence of plasmids, and the lack of histone proteins that would otherwise protect eukaryotic DNA from mechanical shearing.

The Nucleoid: The Primary Location of Prokaryotic DNA

The nucleoid is the region within a prokaryotic cell where the chromosomal DNA is concentrated. Unlike the eukaryotic nucleus, the nucleoid is not enclosed by a membrane. It occupies a defined area of the cytoplasm and contains the bacterial chromosome along with associated proteins and RNA molecules.

Structural Organization of the Nucleoid

The prokaryotic chromosome is typically a single, circular double-stranded DNA molecule. In most bacterial species, this chromosome is compacted into a structure that fits within the cell through a combination of supercoiling and association with nucleoid-associated proteins. These proteins, such as HU and IHF, induce large bends in DNA and aid in chromosomal compaction. They also function as regulatory cofactors in processes including site-specific recombination and the initiation of replication and transcription. HU binds preferentially to damaged or distorted DNA, while IHF shows significant sequence specificity. Both proteins are present in high concentrations in the bacterial nucleoid and are paradigms for understanding DNA bending and indirect readout of sequence.

The nucleoid is not a static structure. Its organization changes in response to growth conditions and environmental signals. Transcription factors and nucleoid-associated proteins act as architects that remodel DNA structure, blurring the traditional distinction between site-specific regulators and global genome organizers. This dynamic organization allows prokaryotes to reprogram gene expression rapidly when environmental conditions change.

Replication Compartments within the Cell

Prokaryotic DNA replication takes place at specific intracellular locations instead of throughout the cytoplasm. Early studies indicated that chromosomal DNA replication, as well as plasmid and viral DNA replication, occurs in close association with the bacterial membrane. More recent work has shown that some replication proteins and specific DNA sequences are localized to particular subcellular regions in bacteria, supporting the existence of replication compartments. The docking of replication factors to large organizing structures may be important for the assembly of active replication complexes. This compartmentalization has been studied in detail in Escherichia coli and Bacillus subtilis, and comparisons with eukaryotic systems reveal fundamental differences in how replication is organized.

Plasmids: Extrachromosomal DNA in Prokaryotes

Plasmids are small, circular double-stranded DNA molecules that exist independently of the chromosomal DNA. They replicate autonomously and can carry genes that provide selective advantages, such as antibiotic resistance, virulence factors, or metabolic capabilities. Plasmids vary in copy number per cell, from one or two copies to hundreds, depending on the plasmid and the host strain.

Plasmid Replication and Maintenance

Plasmid replication occurs at specific intracellular locations, similar to chromosomal replication. The replication machinery for plasmids often associates with the bacterial membrane or with large organizing structures within the cell. This spatial organization ensures that plasmids are faithfully segregated to daughter cells during division. Some plasmids integrate into the chromosome and replicate as part of the chromosomal DNA, while others remain extrachromosomal throughout their life cycle.

Implications for Molecular Biology Techniques

The presence of plasmids in prokaryotic samples has practical implications for diagnostic workflows. When you extract total DNA from a bacterial culture, you will recover both chromosomal and plasmid DNA. If your assay targets a gene that exists on a plasmid, the copy number of that target will be higher than for a chromosomal gene, affecting quantitative results. Plasmid DNA is also more susceptible to shearing during extraction because it is smaller and circular. Understanding whether your target sequence is chromosomal or plasmid-borne is essential for interpreting amplification results and for designing appropriate quality controls.

Prokaryotic Chromosome Structure

The prokaryotic chromosome is a circular double-stranded DNA molecule that contains all the essential genetic information for the cell. Its size varies widely among species, from less than one million base pairs in some symbionts to more than ten million base pairs in some soil bacteria. The chromosome is organized into functional domains that influence gene expression and DNA replication.

GC Content and Nucleotide Skew

The GC content of prokaryotic chromosomes varies considerably among species. For example, a complete genome dataset of Flavobacterium sp. strain PL002 isolated from Antarctic Porphyra algae reported a single circular chromosome of 4,475,065 base pairs with a GC content of 33 percent. Genome closure using long-read sequencing resolved repetitive regions, including complete ribosomal RNA operons, and identified 3,916 genes, including 3,795 protein-coding sequences, 24 rRNA genes, and 65 transfer RNA genes.

Nucleotide skew analysis, which examines the asymmetric distribution of guanine and cytosine between the leading and lagging strands, provides insights into genome evolution. Translational selection and the nature of the genetic code are universally conserved determinants of asymmetric guanine and cytosine distributions in archaeal genomes. In most bacterial chromosomes, mutational processes and DNA repair also result in strand-specific nucleotide skews. Archaeal chromosomes and plasmids show a greatly reduced ability to create mutations or repair DNA damage in a strand-specific manner, revealing fundamental differences in genome maintenance between bacteria and archaea.

Repetitive Sequences and CRISPR Arrays

Prokaryotic chromosomes contain families of repetitive DNA sequences that are present among both domains of prokaryotes, Archaea and Bacteria, but absent from eukaryotes or viruses. One such family is characterized by direct repeats, varying in size from 21 to 37 base pairs, interspaced by similarly sized non-repetitive sequences. These structures are known as clustered regularly interspaced short palindromic repeats, or CRISPR. In most species with two or more CRISPR loci, these loci are flanked on one side by a common leader sequence of 300 to 500 base pairs. The direct repeats and leader sequences are conserved within a species but dissimilar between species.

CRISPR-associated genes, called cas genes, are invariably located adjacent to a CRISPR locus, indicating a functional relationship. The cas3 gene shows motifs characteristic of helicases of the superfamily 2, and the cas4 gene shows motifs of the RecB family of exonucleases, suggesting that these genes are involved in DNA metabolism or gene expression. The spatial coherence of CRISPR and cas genes has stimulated research on the genesis and biological role of these repeats and genes. CRISPR systems function as adaptive immune systems in prokaryotes, providing defense against phage infection and other invading genetic elements.

Prokaryotic Defense Systems and DNA Interactions

Prokaryotes have evolved intricate innate immune systems against phage infection. One example is the Gabija system, a highly widespread prokaryotic defense system that consists of two components, GajA and GajB. GajA functions as a DNA endonuclease that is inactive in the presence of ATP. Cryo-electron microscopy structures of the Gabija system in five states, including apo GajA, GajA in complex with DNA, GajA bound by ATP, apo GajA-GajB, and GajA-GajB in complex with ATP and magnesium, reveal the activation mechanism. GajA is a rhombus-shaped tetramer with its ATPase domain clustered at the center and the topoisomerase-primase domain located peripherally. ATP binding at the ATPase domain stabilizes the insertion region within the ATPase domain, keeping the Toprim domain in a closed state. Upon ATP depletion by phages, the Toprim domain opens to bind and cleave the DNA substrate. GajB, which docks on GajA, is activated by the cleaved DNA, ultimately leading to prokaryotic cell death.

Argonaute Nucleases

Argonaute nucleases use small nucleic acid guides to recognize and degrade complementary nucleic acid targets. Most prokaryotic Argonautes, called pAgos, recognize DNA targets and may play a role in cell immunity against invader genetic elements. Some groups of pAgo nucleases have distinct specificity for DNA guides and RNA targets. These DNA-to-RNA pAgos have non-standard guide-binding pockets in the MID domain and differ in the register of guide DNA binding and target cleavage. In contrast to other pAgos, which coordinate the 5-prime end of the guide molecule by their C-terminal carboxyl, DNA-to-RNA pAgos have an extended C-terminus located away from the MID pocket. Modifications of the C-terminus do not affect guide DNA binding but inhibit cleavage of complementary and mismatched RNA targets by some DNA-to-RNA pAgos. The unique C-terminus found in DNA-to-RNA pAgos can modulate their catalytic properties and can be used as a target for pAgo modifications.

Mobile Genetic Elements and Host DNA Transfer

The prokaryote world is replete with mobile genetic elements, which are self-replicating entities that can move within and between their hosts. Many mobile genetic elements also transfer their own DNA to new hosts but also transfer host DNA located elsewhere on the chromosome in the process. This could potentially lead to indirect benefits to the host when the resulting increase in chromosomal variation results in more efficient natural selection. Mobile genetic elements promote the transfer of host DNA in diverse ways, and evidence of mobile genetic element domestication suggests that there may be host benefits of mobile genetic element-mediated sex.

Prokaryotic DNA Polymerases and Replication Enzymes

DNA polymerases in prokaryotes share conserved catalytic domains with their eukaryotic counterparts. The 3-prime to 5-prime exonuclease active site of E. coli DNA polymerase I is predicted to be conserved for both prokaryotic and eukaryotic DNA polymerases based on amino acid sequence homology. Three amino acid regions containing the critical residues in the E. coli DNA polymerase I involved in metal binding, single-stranded DNA binding, and catalysis of the exonuclease reaction are located in the amino-terminal half and in the same linear arrangement in several prokaryotic and eukaryotic DNA polymerases. Site-directed mutagenesis at the predicted exonuclease active site of the phi 29 DNA polymerase, a model enzyme for prokaryotic and eukaryotic alpha-like DNA polymerases, specifically inactivated the 3-prime to 5-prime exonuclease activity of the enzyme. These results reflect a high evolutionary conservation of this catalytic domain. Based on structural and functional data, a modular organization of enzymatic activities in prokaryotic and eukaryotic DNA polymerases has been proposed.

Replication Origins

The replicon hypothesis, first proposed in 1963 by Jacob and Brenner, states that DNA replication is controlled at sites called origins. Replication origins have been well studied in prokaryotes. The study of eukaryotic chromosomal origins has lagged behind because until recently there has been no method for reliably determining the identity and location of origins from eukaryotic chromosomes. Techniques developed with the yeast Saccharomyces cerevisiae allow both the mapping of replication origins and an assessment of their activity. Two-dimensional agarose gel electrophoresis and Southern hybridization with total genomic DNA are used to determine whether a particular restriction fragment acquires the branched structure diagnostic of replication initiation. This technique has been used to localize origins in yeast chromosomes and assess their initiation efficiency. In some cases, origin activation is dependent upon the surrounding context.

Practical Workflow: Working with Prokaryotic DNA in the Laboratory

When you work with prokaryotic DNA in a diagnostic or research laboratory, you need to make deliberate decisions about sample preparation, extraction methods, and quality assessment. The following workflow outlines the key steps and considerations.

Step 1: Sample Collection and Cell Lysis

Collect your bacterial sample according to your laboratory's standard operating procedures. For liquid cultures, pellet the cells by centrifugation and discard the supernatant. For solid media, suspend a single colony or a loopful of cells in an appropriate buffer. The choice of lysis method depends on the bacterial species. Gram-positive bacteria require more vigorous lysis due to their thick peptidoglycan layer, while Gram-negative bacteria are more easily lysed. Enzymatic lysis using lysozyme, mechanical disruption using bead beating, or chemical lysis using detergents are common approaches. Always follow your laboratory's biosafety guidelines when handling bacterial cultures. The World Health Organization Laboratory Biosafety Manual provides guidance on safe handling of microorganisms and is an essential reference for laboratory safety practices.

Step 2: DNA Extraction and Purification

After lysis, you need to separate DNA from proteins, RNA, and other cellular components. Commercial extraction kits typically use silica membrane binding or magnetic bead technology. The circular nature of prokaryotic chromosomes makes them susceptible to shearing during pipetting and vortexing. Use wide-bore pipette tips and gentle mixing to minimize mechanical damage. If you need to preserve large DNA fragments for long-read sequencing, consider using specialized protocols that avoid vigorous mixing. The World Health Organization Laboratory Quality Management System Handbook provides guidance on quality assurance for laboratory testing, including nucleic acid extraction procedures.

Step 3: Quality Assessment

Assess the quantity and quality of your extracted DNA using spectrophotometry, fluorometry, or gel electrophoresis. Spectrophotometry measures absorbance at 260 nanometers for DNA and 280 nanometers for protein contamination. A ratio of absorbance at 260 to 280 nanometers of approximately 1.8 indicates pure DNA, while lower ratios suggest protein contamination. Fluorometry using DNA-binding dyes provides a more accurate measurement of double-stranded DNA concentration. Gel electrophoresis allows you to visualize the size distribution of your DNA and detect degradation or shearing. For prokaryotic DNA, you should see a high-molecular-weight band representing the chromosome and possibly smaller bands representing plasmids.

Step 4: Downstream Applications

The choice of downstream application determines the required DNA quality and quantity. PCR amplification requires nanogram quantities of DNA and tolerates some degradation. Whole genome sequencing requires higher quality DNA, especially for long-read platforms. The National Center for Advancing Translational Sciences Assay Guidance Manual provides detailed information on assay development and validation, including nucleic acid-based assays. The U.S. Food and Drug Administration Bioanalytical Method Validation Guidance provides recommendations for validating bioanalytical methods, including those used to measure nucleic acid targets.

Records and Measurements for Prokaryotic DNA Work

Maintaining accurate records is essential for reproducible laboratory work. Document the following information for each DNA extraction and downstream application:

Store extracted DNA in a dedicated freezer at the appropriate temperature. Repeated freeze-thaw cycles degrade DNA, so aliquot samples if you plan to use them multiple times. Record the number of freeze-thaw cycles for each aliquot.

Common Failure Patterns in Prokaryotic DNA Work

Several recurring problems affect laboratory work with prokaryotic DNA. Recognizing these patterns helps you troubleshoot efficiently.

Low DNA Yield

Low DNA yield can result from incomplete cell lysis, particularly with Gram-positive bacteria or mycobacteria that have robust cell walls. Increase the lysozyme concentration or extend the incubation time. Some species require additional mechanical disruption. Check that your lysis buffer contains the correct components and that you are using the appropriate amount of starting material.

DNA Degradation

DNA degradation appears as a smear on gel electrophoresis instead of a distinct high-molecular-weight band. This often results from nuclease contamination in buffers or from prolonged storage at improper temperatures. Use nuclease-free reagents and add EDTA to your storage buffer to chelate magnesium ions required by many nucleases. Avoid vortexing and vigorous pipetting.

PCR Inhibition

PCR inhibition can occur when co-purified contaminants, such as polysaccharides, humic acids, or residual reagents, interfere with polymerase activity. If you suspect inhibition, dilute your DNA template or use an additional purification step. Include an internal amplification control in your PCR reactions to detect inhibition. The National Center for Biotechnology Information provides literature resources on PCR optimization and troubleshooting.

Plasmid Loss

Plasmids can be lost during subculturing if the selective pressure is removed. If you are working with plasmid-bearing strains, maintain antibiotic selection as appropriate. Some plasmids are unstable and require special growth conditions. Document plasmid presence in your records and verify plasmid retention periodically.

Quality Controls and Assurance

Quality control is essential for reliable diagnostic results. The World Health Organization Laboratory Quality Management System Handbook emphasizes the importance of quality assurance in laboratory testing. Implement the following controls in your prokaryotic DNA workflows.

Positive and Negative Controls

Include a positive control with known DNA concentration and a negative control without template in every amplification run. The positive control verifies that the assay works, while the negative control detects contamination. For quantitative assays, include a standard curve with known concentrations of your target sequence.

Internal Amplification Controls

An internal amplification control is a non-target sequence that is co-amplified in the same reaction. It detects inhibition and confirms that the reaction conditions support amplification. If the internal control fails to amplify, the result is invalid regardless of the target signal.

Replicate Testing

Run samples in duplicate or triplicate to assess precision. The U.S. Food and Drug Administration Bioanalytical Method Validation Guidance recommends evaluating accuracy, precision, selectivity, and stability when validating bioanalytical methods. Document all quality control results and review them regularly for trends.

Biosafety Considerations

Working with prokaryotic DNA requires attention to biosafety. The World Health Organization Laboratory Biosafety Manual provides comprehensive guidance on safe laboratory practices. Follow these principles when handling bacterial cultures and extracted DNA.

Risk Assessment

Conduct a risk assessment before starting any work with prokaryotic organisms. Consider the pathogenicity of the species, the route of transmission, and the concentration of organisms you will handle. Assign the appropriate biosafety level based on your risk assessment.

Personal Protective Equipment

Wear appropriate personal protective equipment, including laboratory coats, gloves, and eye protection. Change gloves frequently and wash hands after removing gloves. Do not eat, drink, or apply cosmetics in the laboratory.

Decontamination

Decontaminate work surfaces before and after procedures using an appropriate disinfectant. Autoclave all biological waste before disposal. Treat liquid waste with disinfectant before pouring down the drain.

Containment

Use a biological safety cabinet when working with organisms that produce aerosols. Centrifuge tubes must be sealed properly to prevent aerosol release. The National Center for Advancing Translational Sciences Assay Guidance Manual includes information on safe assay development practices.

Limitations and Interpretation Boundaries

Understanding the limitations of prokaryotic DNA analysis prevents overinterpretation of results.

Genome Plasticity

Prokaryotic genomes are dynamic. Horizontal gene transfer, mobile genetic elements, and genomic islands contribute to significant variation within species. A single reference genome may not represent all strains of a species. When you design primers or probes, verify that your target sequence is conserved across the strains you expect to encounter. The genomic island locations within a genome can vary, and this variability affects the interpretation of typing results.

Plasmid versus Chromosomal Targets

If your assay targets a gene that can be present on either the chromosome or a plasmid, the copy number may vary between strains. This variability affects quantitative results. Confirm the location of your target gene in the strains you are testing.

Sequence Divergence

Prokaryotic species can show substantial sequence divergence at the nucleotide level. Primers designed against one strain may fail to amplify another strain of the same species. Use conserved regions for primer design and validate your assay against a panel of diverse strains.

Mixed Populations

Clinical and environmental samples often contain multiple prokaryotic species. Total DNA extraction from mixed populations produces a mixture of genomes. Interpretation of results from mixed samples requires careful consideration of the relative abundance of each species.

Professional Escalation Criteria

Recognize when to escalate issues to a supervisor or seek additional expertise.

Unexpected Results

If you obtain results that contradict previous findings or clinical expectations, repeat the test and review your records. If the discrepancy persists, escalate to your supervisor. Do not report results that you cannot verify.

Quality Control Failures

If quality controls fail repeatedly, stop testing and investigate the cause. Check reagent lots, instrument calibration, and technician technique. Escalate persistent quality control failures to your quality manager.

Equipment Malfunction

If your equipment produces inconsistent results or fails calibration, remove it from service and notify the appropriate personnel. Do not use equipment that has not passed calibration.

Safety Incidents

Report all safety incidents, including spills, exposures, and equipment failures, to your supervisor immediately. Follow your institution's incident reporting procedures.

Frequently Asked Questions

Where is DNA found in prokaryotic cells?

DNA in prokaryotic cells is found in two main locations. The primary location is the nucleoid, a region of the cytoplasm that contains the single circular chromosome. The nucleoid is not enclosed by a membrane. The second location is in plasmids, which are smaller circular DNA molecules that exist independently of the chromosome. Plasmids replicate autonomously and can carry genes for antibiotic resistance, virulence, or metabolic functions.

How is prokaryotic DNA different from eukaryotic DNA?

Prokaryotic DNA differs from eukaryotic DNA in several fundamental ways. Prokaryotes typically have a single circular chromosome located in the nucleoid, while eukaryotes have multiple linear chromosomes enclosed in a membrane-bound nucleus. Prokaryotic DNA is not associated with histone proteins, although nucleoid-associated proteins help compact the DNA. Prokaryotic genes generally lack introns, and the chromosome has a single replication origin. Eukaryotic chromosomes have multiple replication origins and are organized into nucleosomes.

What is the nucleoid?

The nucleoid is the region within a prokaryotic cell where the chromosomal DNA is concentrated. It is not a membrane-bound organelle but rather a distinct area of the cytoplasm. The nucleoid contains the bacterial chromosome along with associated proteins and RNA molecules. Nucleoid-associated proteins such as HU and IHF induce bends in the DNA and aid in chromosomal compaction. The nucleoid is dynamic and changes its organization in response to environmental conditions.

What are plasmids and why are they important?

Plasmids are small, circular double-stranded DNA molecules that exist independently of the chromosomal DNA in prokaryotic cells. They replicate autonomously and can carry genes that provide selective advantages, such as antibiotic resistance, virulence factors, or metabolic capabilities. Plasmids are important in molecular biology because they are widely used as cloning vectors. In diagnostic settings, plasmid-borne genes can affect the interpretation of quantitative assays because plasmid copy number can vary.

Do prokaryotes have histones?

Prokaryotes do not have histone proteins in the same way that eukaryotes do. Instead, they use nucleoid-associated proteins such as HU and IHF to compact their DNA. These proteins induce large bends in the DNA and are present in high concentrations in the bacterial nucleoid. HU binds preferentially to damaged or distorted DNA, while IHF shows significant sequence specificity. These proteins also function as regulatory cofactors in processes such as site-specific recombination and the initiation of replication and transcription.

What is CRISPR and where is it found?

CRISPR stands for clustered regularly interspaced short palindromic repeats. These are families of repetitive DNA sequences found in both Archaea and Bacteria but absent from eukaryotes and viruses. CRISPR loci consist of direct repeats, varying in size from 21 to 37 base pairs, interspaced by similarly sized non-repetitive sequences. CRISPR-associated genes, called cas genes, are located adjacent to CRISPR loci and have a functional relationship with them. CRISPR systems function as adaptive immune systems in prokaryotes, providing defense against phage infection.

How does prokaryotic DNA replication differ from eukaryotic replication?

Prokaryotic DNA replication takes place at specific intracellular locations, often in close association with the bacterial membrane. The chromosome has a single replication origin, and replication proceeds bidirectionally from that origin. Eukaryotic chromosomes have multiple replication origins, and replication is coordinated through the cell cycle. Prokaryotic replication proteins and specific DNA sequences are localized to particular subcellular regions, supporting the existence of replication compartments. The 3-prime to 5-prime exonuclease active site of DNA polymerases is conserved between prokaryotes and eukaryotes, reflecting a high evolutionary conservation of this catalytic domain.

What quality controls should I use when working with prokaryotic DNA?

Use positive and negative controls in every amplification run. The positive control verifies that the assay works, and the negative control detects contamination. Include an internal amplification control to detect inhibition. Run samples in duplicate or triplicate to assess precision. Document all quality control results and review them regularly for trends. The World Health Organization Laboratory Quality Management System Handbook provides guidance on quality assurance for laboratory testing.

Related Diagnostic Guides

• Common Laboratory Techniques: A Practical Guide for Molecular Biology Beginners
• Understanding the Multiple Cloning Site (MCS) in Plasmids: Structure, Function, and Selection
• How to Store and Handle Chemical Reagents for Molecular Biology
• How to Calculate the Number of Cells in a Confluent Monolayer
• Vero Cell Culture Techniques for Viral Diagnostics

References and Further Reading

• Laboratory Quality Management System Handbook. World Health Organization.
• Laboratory Biosafety Manual. World Health Organization.
• Assay Guidance Manual. National Center for Advancing Translational Sciences.
• Bioanalytical Method Validation Guidance. U.S. Food and Drug Administration.
• NCBI Literature Resources. National Center for Biotechnology Information.
• Structures and activation mechanism of the Gabija anti-phage system.. Nature, 2024.
• Identification of genes that are associated with DNA repeats in prokaryotes.. Molecular microbiology, 2002.
• Compartmentalization of prokaryotic DNA replication.. FEMS microbiology reviews, 2005.
• Unusual Guide-binding Pockets in RNA-targeting pAgo Nucleases.. Journal of molecular biology, 2024.
• A conserved 3'----5' exonuclease active site in prokaryotic and eukaryotic DNA polymerases.. Cell, 1989.
• Mapping replication origins in yeast chromosomes.. BioEssays : news and reviews in molecular, cellular and developmental biology, 1991.
• Structure-based analysis of HU-DNA binding.. Journal of molecular biology, 2007.
• Why do mobile genetic elements transfer DNA of their hosts?. Trends in genetics : TIG, 2024.
• Structure-based prokaryotic transcription shapes adaptation and host-invader interplay.. 2026.
• Engineering yeast chromosomal telomeres with a bacteriophage system.. 2026.
• Mapping the interactome of recombinant human protein KIAA1143.. 2026.
• Genome modelling and design across all domains of life with Evo 2.. 2026.
• On the origins and variation of nucleotide skews of archaeal genomes.. 2026.
• Complete genome dataset of &lt,i&gt,Flavobacterium&lt,/i&gt, sp. strain PL002 isolated from Antarctic &lt,i&gt,Porphyra&lt,/i&gt, algae.. 2026.
• Investigating the nature of prokaryotic genomic island locations within a genome. Plos One, 2024.
• Profiling Prokaryotic Communities and Aaptamines of Sponge Aaptos suberitoides from Tulamben, Bali. Marine Biotechnology, 2023.

This article is educational and does not replace validated laboratory procedures, institutional biosafety review, manufacturer instructions, or professional interpretation.