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Related Experiment Video

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Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches
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Mutations in pyrin masquerading as a primary immunodeficiency.

Yousef R Badran1, Mariam Rajab2, Rima Hanna-Wakim3

  • 1Division of Immunology, Children's Hospital and Department of Pediatrics, Harvard Medical School, Boston, MA, USA.

Clinical Immunology (Orlando, Fla.)
|August 20, 2016
PubMed
Summary

Whole exome sequencing identified pyrin mutations in two patients with primary immunodeficiency, recurrent infections, and early-onset colitis. This highlights the utility of genetic testing for complex inflammatory and immune disorders.

Keywords:
Familial Mediterranean feverPrimary immunodeficiencyPyrinWhole exome sequencing

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Area of Science:

  • Genetics
  • Immunology
  • Molecular Biology

Background:

  • Primary immunodeficiencies (PIDs) present with diverse symptoms, complicating diagnosis.
  • Whole exome sequencing (WES) is a powerful tool for identifying genetic causes of PIDs.
  • Familial Mediterranean fever (FMF) is an autoinflammatory disorder often presenting with recurrent fevers and serositis.

Observation:

  • Two patients presented with recurrent infections and early-onset colitis, suggestive of PID.
  • Clinical presentation overlapped with other autoinflammatory and immunodeficiency conditions.
  • Whole exome sequencing was performed due to diagnostic challenges.

Findings:

  • Genetic analysis revealed mutations in the pyrin gene in both patients.
  • Pyrin mutations are the known cause of familial Mediterranean fever (FMF).
  • This finding links FMF to the spectrum of primary immunodeficiencies.

Implications:

  • WES can uncover unexpected genetic diagnoses in patients with complex presentations.
  • Pyrin mutations should be considered in the differential diagnosis of early-onset colitis and recurrent infections.
  • Expanding the understanding of genetic disorders impacting immune function.