Boster Bio Life Science Blog

The 2024 AACR Annual Meeting is coming up soon! Join us in San Diego from April 5-10 for the annual event. Every year, the cancer research community gathers to share the latest advances in cancer science and medicine at the AACR Annual Meeting.

Drop by Booth #804 to pick up technical resources and an adorable Dr. Booster figurine! Come and discover how our products and services can boost your research. We look forward to seeing you there...

The immune system is a complex network that protects the body from harmful pathogens such as bacteria, viruses, and other foreign substances. Central to this defense mechanism are various molecular components, including antibodies, antigens, epitopes, haptens, and immunogens. Each of these components plays a unique role in the immune response, and understanding their differences is crucial for comprehending how the immune system functions.

Antibodies, also known as immunoglobulins, are specialized Y-shaped proteins produced by B cells, a type of white blood cell. These proteins are critical in the immune response as they identify and neutralize foreign objects like bacteria and viruses. The structure of antibodies allows them to specifically recognize and bind to antigens, effectively marking them for destruction by other immune cells. In research applications, this specificity can be enhanced or visualized through chemical labeling—a process typically facilitated by an antibody conjugation service. This specificity is due to the unique binding sites on the antibody that match specific parts of the antigen, known as epitopes.

As antibody research moves from basic immune recognition to reagent and therapeutic development, researchers may generate binders through approaches such as single B cell antibody discovery or phage display library screening, depending on whether the goal is to preserve native heavy/light chain pairing or to run fully in vitro, high-throughput selection.

Antigens are molecules or molecular structures, often found on the surface of pathogens, that can elicit an immune response. They are typically proteins or polysaccharides and are recognized by the immune system as foreign. The interaction between antigens and antibodies is highly specific, akin to a lock and key, where the antibody binds to the antigen to neutralize or flag it for removal. This interaction is fundamental to the body’s ability to recognize and remember pathogens, forming the basis of immunity.

Epitopes, also known as antigenic determinants, are specific regions on an antigen that are recognized by antibodies. Each antigen can have multiple epitopes, allowing for the binding of different antibodies. This multiplicity enables a robust and versatile immune response, as various antibodies can target different parts of a single pathogen. The specificity of epitopes is crucial in vaccine development, as vaccines aim to introduce harmless forms of epitopes to stimulate an immune response without causing disease.

Haptens are small molecules that, by themselves, are not immunogenic, meaning they cannot independently provoke an immune response. However, when haptens bind to larger carrier proteins, they form a complex that the immune system recognizes as foreign, triggering an immune response. This phenomenon is particularly important in pharmacology and allergen studies, where certain drugs or small molecules can act as haptens, causing allergic reactions when they bind to proteins in the body.

Immunogens are a subset of antigens that can trigger an immune response on their own. While all immunogens are antigens, not all antigens qualify as immunogens. For instance, a hapten is an antigen but not an immunogen unless it is attached to a carrier protein. Immunogens must have certain properties, such as adequate size and molecular complexity, to effectively stimulate the immune system. This distinction is important in vaccine development and allergy research, where understanding what makes an antigen immunogenic can inform treatment strategies.

Depending on the downstream application, antibodies raised against these immune targets may later be reformatted for different production systems. For example, smaller binding formats such as Fab, scFv, or VHH are often well suited to microbial expression systems for antibody fragment production, especially when Fc-mediated functions or mammalian glycosylation are not required.

We’ve provided a table below that summarizes and highlights the distinct roles and interactions of these immune system components.

The immune system's effectiveness hinges on interactions among antibodies, antigens, haptens, epitopes, and immunogens. Antibodies recognize and bind to antigens, identifying foreign molecules for destruction. Haptens, though non-immunogenic alone, provoke responses when linked to larger proteins. Epitopes are specific antigen regions targeted by antibodies, while immunogens independently trigger immune responses. Comprehending these dynamics not only advances immunological understanding but also...

Meet us in Salt Lake City from March 10-14 at the Society of Toxicology (SOT) 63rd Annual Meeting and ToxExpo! Over 5,000 toxicologists and professionals attend this event to share the latest science and technology advancements, make new connections, and engage in professional development.

Stop by Booth #1802 to pick up technical resources and an adorable Dr. Booster figurine! Come and discover how our products, services, and resources can boost your research. We hope to see you there...

Blotting techniques are essential tools in molecular biology and biochemistry, allowing researchers to detect and analyze nucleic acids and proteins. These techniques enable scientists to uncover intricate details about genetic material, gene expression, and protein interactions. From the foundational Southern blotting, which revolutionized DNA analysis, to the versatile Western blotting, a staple in protein research, blotting methods have become indispensable tools in the laboratory.

This blog will delve into 10 blotting types, each with unique applications and methodologies. We'll explore the nuances of each technique, highlighting their roles in studying DNA, RNA, and proteins.

If you’re looking to learn about the different types of blotting techniques for your research, this guide is for you!

1. Southern blotting

Southern blotting, the original blotting technique, is named after its inventor Edwin Southern who developed the method in 1975 for transferring DNA from a gel to a membrane, enabling the identification of specific DNA sequences. The naming convention for subsequent blotting techniques was influenced by this original name.

To this day, Southern blotting remains a common technique for DNA analysis and identification. The process involves digesting DNA with restriction enzymes, separating the fragments by gel electrophoresis, and transferring them onto a membrane. Labeled DNA or RNA probes then hybridize to the target sequences. Popular in genetics and molecular biology, Southern blotting is used for the detection of specific DNA sequences, study of DNA methylation patterns, RFLP (Restriction Fragment Length Polymorphism) analysis for genetic fingerprinting, identification of gene mutations and polymorphisms, and gene mapping and cloning.

2. Northern blotting

Northern blotting was named by James Alwine, David Kemp, and George Stark in a 1977 paper as a playful pun on Southern blotting, indicating its use for RNA rather than DNA.

This technique is similar to Southern blotting, but focuses on RNA analysis. RNA samples are separated by gel electrophoresis, transferred to a membrane, and hybridized with labeled DNA or RNA probes to detect and quantify specific RNA transcripts. Northern blotting is commonly used to analyze gene expression patterns, determine mRNA size and abundance, study RNA processing and degradation, and detect alternative splicing events. To quantify RNA expression levels beyond blotting techniques, a solid qpcr service provides a highly sensitive and accurate alternative for transcript analysis.

3. Western blotting

Western blotting, also called immunoblotting, is widely used for protein detection and analysis, making it the most popular blotting technique. For streamlined and reproducible results, many researchers turn to a dedicated Western Blotting Service to handle the full workflow with optimized protocols. Proper western blot sample preparation is essential to ensure reliable and reproducible protein detection throughout the process. Understanding the western blot principle is key to effectively applying this method and interpreting its results accurately. The method was first described by Towbin et al. in 1979 and the term "western" was coined by W. Neal Burnette in 1981 as a tongue-in-cheek reference to the direction naming theme established by Southern and Northern blotting, this time focusing on proteins instead of nucleic acids.

This technique detects specific proteins by separating them via gel electrophoresis (typically SDS-PAGE), transferring them to a membrane (usually PVDF or nitrocellulose: AR0135-02, AR0135-04), and using primary and secondary antibodies for detection. The secondary antibody is usually conjugated to an enzyme or a fluorescent tag that produces a detectable signal when exposed to a substrate or under specific conditions. For your western blot experiment, you can explore Boster’s catalog to browse primary antibodies and secondary antibodies validated for western blot as well as find western blot reagents you will need.

Before electrophoresis begins, sample extraction quality already shapes the final blot. This guide on which lysis buffer to use for Western blot helps match buffer choice to target protein type, solubility, and downstream blot performance.

After protein extraction and electrophoresis, transfer is the next major checkpoint. This practical guide on how to check transfer quality in Western blot is useful for confirming whether weak or uneven signal comes from transfer failure rather than from the antibody step alone.

If you are deciding between PVDF and nitrocellulose for sensitivity, background, binding capacity, or handling preference, this guide on which membrane to choose for Western blot offers a more practical side-by-side comparison for real workflow decisions.

For researchers moving from detection to measurement, this guide on western blot quantification provides a practical workflow for densitometry, normalization, and fold-change calculation, with particular emphasis on staying in the linear range and avoiding saturation-related errors.

If the same membrane needs to be reprobed for another target or for loading-control confirmation, this Western blot stripping buffer protocol provides a practical starting point for removing bound antibodies while preserving usable blot signal.

In protein research and diagnostics, Western blot is used for the detection and quantification of specific proteins in a sample, analysis of protein expression levels across different conditions or treatments, detection of post-translational modifications (e.g., phosphorylation, glycosylation), study of protein-protein interactions, and confirmation of protein identity and purity in recombinant protein production. For researchers interested in analyzing protein expression directly within intact cells, consider our in-cell western blot service, which offers a high-throughput, quantitative alternative to traditional blotting techniques.

To learn more about western blotting, download our Western Blot eBook, which discusses the principle, protocol, troubleshooting tips, and FAQs for western blot.

4. Eastern blotting

Following the directional theme set by Southern and Western blotting, Eastern blotting is used to analyze post-translational modifications (PTMs) of proteins, such as glycosylation or phosphorylation. Many scientists deem Eastern blotting as a variation of Western blotting.

The Eastern blot technique involves transferring proteins separated by gel electrophoresis onto a membrane, followed by detection using specialized probes or antibodies targeting the PTM of interest. Though less frequently performed than other blotting techniques, Eastern blotting is useful for analyzing PTMs (e.g., glycosylation), studying protein modifications (e.g., phosphorylation, lipidation), and detecting and characterizing glycoproteins and other modified proteins.

5. Far-Western Blotting

Far-Western blotting, derived from Western blotting, focuses on protein-protein interactions. It involves transferring proteins separated by gel electrophoresis onto a membrane and identifies interactions using labeled proteins or peptides to probe for binding with the immobilized target proteins.

Growing in popularity, Far-Western blotting is valuable for identifying and studying protein-protein interactions, mapping interaction domains, and screening potential binding partners.

6. Southwestern blotting

Southwestern blotting combines features of Southern and Western blotting techniques, focusing on DNA-binding protein detection. This technique involves transferring denatured proteins from a gel onto a membrane, followed by incubation with labeled DNA probes to identify proteins that bind to specific DNA sequences.

Though less common than Southern and Western blotting, Southwestern blotting is useful for detecting DNA-binding proteins, studying protein-DNA interactions, and identifying transcription factors and other regulatory proteins.

7. Reverse Northern blotting

Reverse Northern blotting indicates the reversal of the Northern blotting process. Instead of transferring RNA and probing with DNA, Reverse Northern blotting transfers DNA and probes with labeled RNA.

This technique involves immobilizing DNA on a membrane and hybridizing it with labeled RNA or cDNA probes to detect DNA sequences. Although less common than standard Northern blotting, it is used for gene expression analysis using cDNA or genomic DNA arrays, screening differentially expressed genes in various conditions, and studying changes in transcript levels in response to treatments.

8. Colony blotting

Colony blotting is named for its application in screening microbial colonies, such as bacterial or yeast colonies. It involves transferring entire colonies from a culture plate onto a membrane, where specific nucleic acids or proteins are detected through DNA hybridization analysis.

Primarily used in microbiology and cloning, colony blotting helps screen colonies for target DNA or RNA sequences, identify recombinant clones containing specific genetic inserts, and rapidly detect plasmid-containing colonies.

Dot blotting

Dot blotting is frequently used as a quick and simple screening method for the presence or absence of nucleic acids and proteins. Named for the dot-like application of samples on the membrane, it is a simplified version of Western blotting, where samples are directly spotted onto a membrane for detection without prior gel electrophoresis.

Popular for rapid screening, dot blotting is used to screen specific nucleic acids or proteins, relatively quantify target molecules, and analyze large numbers of samples simultaneously. It should be noted that dot blots do not provide information about molecular weight, so false positive signals or the presence of modified proteins are difficult to identify.

Slot blotting

Slot blotting is similar to dot blotting, but less commonly used. Named for the slot-like application of samples, slot blotting involves applying samples in rectangular slots on a membrane, allowing more uniform application and the quantification of target molecules in a sample without the need for gel electrophoresis.

This technique is helpful for analyzing nucleic acids or proteins without electrophoresis, comparing the relative abundance of target molecules in different samples, and screening multiple samples in high-throughput formats. As with dot blots, slot blots are also unable to provide information about the size of the target protein.

Table of Blotting Types

We have provided a table below that highlights the features of each blotting type.

Blotting techniques are important tools in molecular biology and biochemistry. Each blotting method caters to different experimental needs, enabling detailed analysis of DNA, RNA, proteins, and their interactions. By utilizing each technique’s unique advantages and applications, researchers can deepen our understanding of molecular interactions and processes. Boster Bio supports these workflows with advanced solutions like our Recombinant Antib...

Enzyme-Linked Immunosorbent Assay (ELISA) is a versatile and widely used biochemical technique for detecting and quantifying specific molecules such as proteins, peptides, antibodies, and small molecules. These assays are commonly performed using standardized elisa kits, which help ensure consistency and reproducibility across experiments. Different types...

Season’s greetings from the entire Boster team!

May your holidays be full of love, joy, and hope. Wishing you peace, happiness, and success in the new year!

Thank you for your support in 2023 and we look forward to continuing to serve you in the upcoming year.

Have a Merry Christmas and a Happy New Year...

Welcome to the latest issue of Research Spotlight! We're excited to dive into biomedical breakthroughs that are impacting health and disease research.

In the field of neuroscience, research revealed how stress affects the brain, particularly the red nucleus, and its link to anxiety and immune responses. This insight has implications for treating mental health disorders. In respiratory research, a new study advanced our understanding of how the lungs detect allergens, opening up possibilities...

Welcome to this month’s Research Spotlight! In this issue, we are excited to showcase our customers’ new studies that are shaping the future of biomedicine.

In the field of neurology, researchers investigated a critical pathway, p300/NF-κB/NLRP3, impacted by disruptions in chaperone-mediated autophagy, which holds promise for treatments in neurodegenerative diseases. For regenerative medicine, scientists introduced a metal-organic framework-incorporated hydrogel that...

Neuroscience 2023 is taking place in Washington, D.C. at Walter E. Washington Convention Center from November 11-15. Join 30,000 scientists from around the world to discover hot topics and tools for neuroscience!

Meet us at Booth# 2104 to pick up some Boster goodies including pathway posters, technical resources, free phone accessories, and a Dr. Booster plush doll!

Come and discover how our products, services, and resources can boost your research. We hope to see you there...

As autumn leaves turn golden, Boster Bio is excited to present a medley of pioneering studies that have recently been published. This month’s issue covers a spectrum from novel therapeutic interventions to insightful multi-omics analyses.

In the therapeutic domain, we spotlight a novel implantable hydrogel-based sensor that allows for real-time drug monitoring in rats. We also observe a shift in cancer treatments with a new cocktail nanovaccine. Additionally, fresh approaches are introduced for targeting lung fibrosis using mitochondrial transfer and enhancing liver cancer treatments with artesunate.

On a molecular scale, studies revealed how indoor air pollutants impact liver health and blood lipid levels. Scientists also investigated the protective role of gut fungi against intestinal issues and the potential of mung bean sprout nanoparticles in diabetes management. Moreover, recent findings linked a compound in the colon, phosphocholine, with a specific fungus Candida tropicalis, highlighting mycobiota’s importance for our digestive health.

Scroll down to learn more about these discoveries!

Implantable Hydrogel-Protective DNA Aptamer-Based Sensor Supports Accurate, Continuous Electrochemical Analysis of Drugs at Multiple Sites in Living Rats

Authors: Li, S., Dai, J., Zhu, M., Currás, N.A., Li, H., Wang, Y., Wang, Q…
Journal: ACS Nano

The ability to track the levels of specific molecules, such as drugs, metabolites, and biomarkers, in the living body, in real time and for long durations, would improve our understanding of health and our ability to diagnose, treat, and monitor disease. To this end, we are developing electrochemical aptamer-based (EAB) biosensors...

Read More

Cited Boster Product(s): Rat IL-12(P70) ELISA Kit PicoKine® (EK1652); Rat Endothelin 1/EDN1 ELISA Kit PicoKine® (EK0952)

Efficient Intervention for Pulmonary Fibrosis via Mitochondrial Transfer Promoted by Mitochondrial Biogenesis

Authors: Huang, T., Lin, R., Su, Y., Sun, H., Zheng, X., Zhang, J., Lu, X…
Journal: Nature Communications

The use of exogenous mitochondria to replenish damaged mitochondria has been proposed as a strategy for the treatment of pulmonary fibrosis. However, the success of this strategy is partially restricted by the difficulty of supplying sufficient mitochondria to diseased cells. Herein, we report the generation of high-powered mesenchymal...

Read More

Cited Boster Product(s): Mouse MMP-9 ELISA Kit PicoKine® (EK0466); Mouse TGF Beta 1 ELISA Kit PicoKine® (EK0515); 4% Paraformaldehyde (PFA) Solution In PBS (AR1068); Anti-Ki67/MKI67 Antibody Picoband™ (PB9026); Goat Anti-Rabbit IgG (H+L) Secondary Antibody, FITC Conjugated (BA1105)

In Situ Cocktail Nanovaccine for Cancer Immunotherapy

Authors: Liu, M., Xie, D., Hu, D., Zhang, R., Wang Y., Tang, L., Zhou, B…
Journal: Advanced Science

In situ vaccination is a desirable strategy for cancer immunotherapy due to its convenience and capacity to target tumor antigens. Here, an in situ nanovaccine based on a cationic peptide with cholesterol-modified, DP7-C, for cancer immunotherapy is rationally designed, and developed a cancer nanovaccine that is easy to preparate...

Read More

Cited Boster Product(s): Mouse TNF Alpha/Tumor Necrosis Factor ELISA Kit PicoKine® (EK0527)

Artesunate Sensitizes Human Hepatocellular Carcinoma to Sorafenib via Exacerbating AFAP1L2-SRC-FUNDC1 Axis-Dependent Mitophagy

Authors: Ma, Z., Chen, W., Liu, Y., Yu, L., Mao, X., Guo, X., Jiang, F., Guo, Q…
Journal: Autophagy

Sorafenib is the most widely used first-line drug for the treatment of the advanced hepatocellular carcinoma (HCC). Unfortunately, sorafenib resistance often limits its therapeutic efficacy. To evaluate the efficacy of artesunate against sorafenib-resistant HCC and to investigate its underlying pharmacological mechanisms...

Read More

Cited Boster Product(s): Citrate Buffer Powder (AR0024)

Global Analysis of HLA-A2 Restricted MAGE-A3 Tumor Antigen Epitopes and Corresponding TCRs in Non-Small Cell Lung Cancer

Authors: Zhang, B., Ren, Z., Zhao, J., Zhu, Y., Huang, B., Xiao, C., Zhang, Y…
Journal : Theranostics

Background: Advanced non-small cell lung cancer (NSCLC) is the most common type of lung cancer with poor prognosis. Adoptive cell therapy using engineered T-cell receptors (TCRs) targeting cancer-testis antigens, such as Melanoma-associated antigen 3 (MAGE-A3), is a potential approach for the treatment of NSCLC. However, systematic...

Read More

Cited Boster Product(s): HRP Conjugated AffiniPure Goat Anti-Rabbit IgG (H+L) (BA1054)