Biotechnology:Understand The Immunology Basics to Gene Level

Discover immune system basics—from white blood cells and lymphocytes to hematopoiesis in bone marrow, lymph nodes as secondary organs, and antibody-driven phagocyte defense.

Explore the immune system basics, including barriers and defense against pathogens. Identify key immune cells like macrophages, neutrophils, dendritic cells, B cells, and T cells.

Explore how immune cells like neutrophils, macrophages, dendritic and natural killer cells defend the body, present antigens, and activate antibody production to fight pathogens.

Trace hematopoiesis in bone marrow as hematopoietic stem cells differentiate into myeloid and lymphoid lineages, forming platelets, red and white blood cells, neutrophils, and lymphocytes.

Explore the antibody structure as a y-shaped protein built from two heavy and two light polypeptide chains, featuring variable and constant regions that define antigen binding and flexibility.

Explain how B cells perform class switching recombination to change antibody heavy chain constant regions, preserving antigen specificity while cytokine signals trigger double-stranded breaks repaired by non-homologous end joining.

Understand epitopes and paratopes as key players in immune recognition, and learn how antigen presenting cells process antigens into MHC-presented peptides recognized by T cells and antibodies.

Explore antibody isotypes, allotypes, and idiotypes, detailing heavy and light chains, variable and constant regions, and how amino acid variations shape antigen binding and immune responses.

Explains innate immunity as a non-specific first line of defense with skin and mucus. Contrasts adaptive immunity as a specific second line using antigen receptors and antibodies, memory.

Explore the adaptive immune system’s specificity, memory, and B cells–driven antibody production that clear antigens and enable faster responses on re-exposure.

Explore the major histocompatibility complex in humans and mice, its class I, II, and III genes, and how MHC typing guides transplantation through self-nonself recognition and antigen presentation.

Explain how MHC class I presents endogenous peptides to cytotoxic T cells, detailing proteasomal degradation, ER loading, and surface display.

Learn how VDJ gene rearrangement creates antibody diversity by recombining V, D, and J segments in heavy and light chains, guided by Rag1/Rag2 and the 12/23 rule.

This lecture outlines the inflammatory response as the innate immunity hallmark, detailing tissue injury triggers cytokines such as tumor necrosis factor alpha and interleukin-1, neutrophil recruitment, phagocytosis, and repair.

Differentiate immunogens from antigens: immunogens generate an immune response; antigens bind antibodies or lymphocytes, and haptens become immunogenic only when linked to a carrier.

antibody testing offers fast, early diagnosis in basic labs with about 70% sensitivity versus pcr, but shows reduced sensitivity in older adults, risking false negatives.