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Related Experiment Videos

Subtyping for TNFa microsatellite sequence variation.

A R van der Slik1, D C Shing, P Eerligh

  • 1Department of Immunohaematology and Blood Transfusion, Leiden University Medical Centre, The Netherlands.

Immunogenetics
|December 29, 2000
PubMed
Summary
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Tissue antigens·2011

Novel sequence variations in the Tumor Necrosis Factor alpha (TNFa) locus were identified using nested polymerase chain reaction-sequence-specific primer (PCR-SSP) methods. These variations act as distinct TNFa alleles, impacting major histocompatibility complex (MHC) genetic analyses.

Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Human Genetics

Background:

  • The Tumor Necrosis Factor alpha (TNFa) microsatellite locus is a key genetic marker for major histocompatibility complex (MHC) studies.
  • Previous research has identified novel sequence variations at the TNFa locus, potentially affecting genetic analyses.
  • Understanding these variations is crucial for accurate MHC research.

Purpose of the Study:

  • To develop and validate a nested polymerase chain reaction-sequence-specific primer (PCR-SSP) method for typing TNFa sequence variations.
  • To investigate the presence and frequency of these TNFa variations in human populations.
  • To determine if these variations represent distinct TNFa alleles.

Main Methods:

  • Sequencing analysis of lymphoblastoid cell lines (n=13) to identify upstream sequence variations at the TNFa locus.

Related Experiment Videos

  • Nested PCR-SSP technique applied to a larger panel of B lymphoblastoid cell lines (n=34) and a Dutch population sample (n=272).
  • Microsatellite typing and haplotyping analysis involving HLA-DR and HLA-B loci.

    • Main Results:

    • Three novel sequence variations upstream of the TNFa dinucleotide repeat were identified.
    • Nested PCR-SSP successfully detected these variations and identified a fourth subtype in the Dutch population.
    • TNFa alleles a7 and a10 exhibited distinct conformations ('splitting'), and specific variants like TNFa7.2 were found on an extended haplotype (DR7-TNFa7.2-B13).

    Conclusions:

    • The developed nested PCR-SSP method is effective for typing TNFa sequence variations.
    • These sequence variations occur at significant frequencies in the general population and behave as distinct TNFa alleles.
    • The findings enhance the utility of TNFa as a genetic marker in MHC studies.