Related Experiment Video

Updated: Sep 2, 2026

Personalized Peptide Arrays for Detection of HLA Alloantibodies in Organ Transplantation
08:07

Personalized Peptide Arrays for Detection of HLA Alloantibodies in Organ Transplantation

Published on: September 6, 2017

Extended MHC haplotypes in 21-hydroxylase-deficiency congenital adrenal hyperplasia: shared genotypes in unrelated

E Fleischnick, Z L Awdeh, D Raum

    Lancet (London, England)
    |January 22, 1983
    PubMed

    Insights

    Rare complement and HLA alleles, including C4B*31 and HLA-Bw47, were identified in families with 21-hydroxylase-deficiency congenital adrenal hyperplasia. These extended MHC haplotypes may serve as genetic markers for 21-hydroxylase deficiency mutations.

    Area of Science:

    • Immunogenetics
    • Human Genetics
    • Endocrinology

    Background:

    • Congenital adrenal hyperplasia (CAH) due to 21-hydroxylase deficiency is a genetic disorder.
    • Specific HLA and complement alleles are known to be associated with certain autoimmune diseases and genetic conditions.
    • Understanding the genetic basis of CAH can aid in diagnosis and genetic counseling.

    Purpose of the Study:

    • To investigate the association of HLA, complement, and glyoxalase I alleles with classical 21-hydroxylase-deficiency congenital adrenal hyperplasia.
    • To identify potential genetic markers for this specific form of CAH.

    Main Methods:

    • Studied HLA, complement, and glyoxalase I alleles in 29 families with classical 21-hydroxylase-deficiency CAH.
    • Defined haplotypes within these families.
    • Analyzed the frequency of specific rare alleles and extended haplotypes.

    Main Results:

    • A rare complement allele, C4B*31, was found in over 20% of haplotypes and was consistently part of the FCO,31 complement haplotype.
    • This FCO,31 haplotype was strongly associated with the rare HLA allele HLA-Bw47, HLA-A3, HLA-Cw6, HLA-DR7, and the glyoxalase I allele GLO1.
    • Over 20% of studied haplotypes contained this extended haplotype: HLA-(A3), Bw47, Cw6, DR7, FCO,31, GLO 1.
    • Three other extended haplotypes were found twice in unrelated patients with concordant disease phenotypes.

    Conclusions:

    • Extended Major Histocompatibility Complex (MHC) haplotypes may serve as important genetic markers for different mutations causing 21-hydroxylase deficiency.
    • The identified extended haplotype is a significant finding for understanding the genetic architecture of 21-hydroxylase deficiency CAH.

    More Related Videos

    Microsatellite DNA Genotyping and Flow Cytometry Ploidy Analyses of Formalin-fixed Paraffin-embedded Hydatidiform Molar Tissues11:54

    Microsatellite DNA Genotyping and Flow Cytometry Ploidy Analyses of Formalin-fixed Paraffin-embedded Hydatidiform Molar Tissues

    Published on: October 20, 2019

    Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model03:45

    Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model

    Published on: August 8, 2022

    Related Concept Videos

    Exon Recombination02:32

    Exon Recombination

    The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
    Exon shuffling follows “splice frame rules.” Each exon has three reading...
    Genome-wide Association Studies-GWAS01:11

    Genome-wide Association Studies-GWAS

    Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
    GWAS does not require the identification of the target gene involved in...