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Related Experiment Videos

New TAP2 polymorphisms in Africans

J Tang1, S Allen, E Karita

  • 1Department of Medicine, University of Alabama at Birmingham, 35294, USA. jtang@epi.soph.uab.edu

Tissue Antigens
|July 22, 1998
PubMed
Summary
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New genetic variations in the Transporters Associated with Antigen Processing 2 (TAP2) gene were identified in HIV-1 patients. These TAP2 polymorphisms may influence disease progression in individuals with HIV-1 infection.

Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Virology

Background:

  • Polymorphisms in Transporters Associated with Antigen Processing (TAP) genes are linked to varied disease progression in HIV-1-infected individuals.
  • Previous research suggests TAP gene variations play a role in immune response and disease outcomes.

Purpose of the Study:

  • To identify and characterize novel polymorphic sites within the TAP2 coding region.
  • To investigate the association of these new TAP2 variants with disease progression in HIV-1-infected populations.

Main Methods:

  • Single-strand conformation polymorphism (SSCP) analysis was used to detect new polymorphic sites.
  • Bi-directional nucleotide sequencing and restriction enzyme digestion were employed for confirmation.
  • Analysis included cohorts from Rwanda and Zambia (n=213).

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Main Results:

  • Four new polymorphic sites were identified in the TAP2 coding region.
  • A Thr to Ala substitution at codon 374 (exon 5) was found in approximately 13% of individuals.
  • Three additional variants in exon 7 (458Thr, 466Gly, 467Val) were found together on the same chromosome, linked to the 374Thr allele.
  • These variants were associated with a unique extended haplotype involving DQB1 and DRB1 markers.

Conclusions:

  • Novel TAP2 polymorphisms have been identified in African cohorts.
  • These variants, particularly the 374Thr-467Ile segment, may represent a distinct genetic marker influencing HIV-1 disease progression.
  • Further research is warranted to elucidate the functional impact of these TAP2 variants on immune response and clinical outcomes in HIV-1 infection.