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Related Experiment Videos

Polymorphism in the RD (D6S45) gene.

P C White1, J Vitek, R G Lahita

  • 1Division of Pediatric Endocrinology, Cornell University Medical College, New York, NY 10021.

Human Genetics
|May 1, 1992
PubMed
Summary
This summary is machine-generated.

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Researchers investigated variations in the RD (D6S45) gene, part of the HLA complex. A small percentage of individuals showed altered repeat numbers, with no significant difference observed between healthy subjects and those with systemic lupus erythematosus.

Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Human Genetics

Background:

  • The RD (D6S45) gene, located in the HLA class III region, encodes a protein characterized by 24 consecutive basic-acidic dipeptide repeats.
  • Polymorphisms within the HLA class III region are associated with autoimmune diseases like systemic lupus erythematosus.

Purpose of the Study:

  • To determine the frequency of variations in the number of dipeptide repeats within the RD (D6S45) gene.
  • To investigate if these repeat number polymorphisms differ between healthy individuals and those with systemic lupus erythematosus.

Main Methods:

  • Polymerase chain reaction (PCR) was employed to analyze the number of repeats in the RD (D6S45) gene.
  • Genotyping was performed on 107 subjects, including healthy individuals and patients with systemic lupus erythematosus.

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Main Results:

  • Variations in the number of dipeptide repeats were observed in 7 out of 107 subjects (3.3%), with individuals carrying genes encoding 22 or 23 repeats.
  • No statistically significant difference in the frequency of these RD gene repeat polymorphisms was found between normal individuals and those with systemic lupus erythematosus.

Conclusions:

  • Polymorphisms in the number of oligopeptide repeats within proteins like the one encoded by the RD gene are present in the human population.
  • The observed frequency of RD gene repeat variations does not appear to be a risk factor for systemic lupus erythematosus, suggesting other genetic or environmental factors are more critical.
  • Studying the frequency of polymorphisms in proteins with oligopeptide repeats can offer insights into the functional constraints governing repeat number variations.