Related Experiment Video

Updated: Aug 12, 2026

Use of Single Chain MHC Technology to Investigate Co-agonism in Human CD8+ T Cell Activation
12:09

Use of Single Chain MHC Technology to Investigate Co-agonism in Human CD8+ T Cell Activation

Published on: February 28, 2019

Conserved, extended MHC haplotypes

C A Alper1, Z Awdeh, E J Yunis

  • 1Department of Pediatrics, Harvard Medical School, Boston, Mass. 02115.

Experimental and Clinical Immunogenetics
|January 1, 1992
PubMed

Insights

Extended major histocompatibility complex (MHC) haplotypes are conserved chromosomal regions impacting transplantation and disease susceptibility. Understanding these extended MHC haplotypes is crucial for optimizing donor matching and analyzing genetic contributions to autoimmune diseases.

Area of Science:

  • Immunogenetics
  • Human Genetics
  • Population Genetics

Background:

  • Extended major histocompatibility complex (MHC) haplotypes are conserved regions on human chromosome 6.
  • These haplotypes are defined by specific HLA-B, complotype (BF, C2, C4A, C4B), and HLA-DR alleles.
  • Approximately one-third of Caucasian MHC haplotypes are extended, explaining significant linkage disequilibrium.

Purpose of the Study:

  • To highlight the significance of extended MHC haplotypes in various biological and clinical contexts.
  • To emphasize their role in tissue transplantation and donor-recipient matching.
  • To underscore their importance in understanding autoimmune diseases and population genetics.

Main Methods:

  • Analysis of extended MHC haplotype structure and composition.
  • Comparison of haplotype frequencies across populations.
  • Investigation of the association between extended haplotypes and disease susceptibility.
  • Evaluation of their utility in transplantation and forensic applications.

Main Results:

  • Extended MHC haplotypes are population-specific and account for linkage disequilibrium.
  • Matching extended haplotypes optimizes engraftment in tissue transplantation.
  • These haplotypes are key markers for HLA-associated autoimmune diseases.
  • They are essential for analyzing gene contributions to immune functions and disease susceptibility.

Conclusions:

  • Extended MHC haplotypes are fundamental to understanding immune function, disease, and transplantation.
  • Their population-specific nature has implications for genetic studies and forensic applications.
  • Further consideration of extended haplotypes is necessary for accurate genetic analysis and clinical practice.

More Related Videos

Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin11:17

Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin

Published on: March 10, 2021

Immunopeptidomics: Isolation of Mouse and Human MHC Class I- and II-Associated Peptides for Mass Spectrometry Analysis09:32

Immunopeptidomics: Isolation of Mouse and Human MHC Class I- and II-Associated Peptides for Mass Spectrometry Analysis

Published on: October 15, 2021

Related Concept Videos

Conserved Binding Sites01:49

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
Multi-species Conserved Sequences02:51

Multi-species Conserved Sequences

Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale  studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
Single Nucleotide Polymorphisms-SNPs01:05

Single 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,...
Multipotency of Hematopoietic Stem Cells01:19

Multipotency of Hematopoietic Stem Cells

The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.