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The molecular basis of hereditary complement factor I deficiency

T J Vyse1, B J Morley, I Bartok

  • 1Department of Medicine, RPMS, Hammersmith Hospital, London, United Kingdom.

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Hereditary complement factor I deficiency results from specific genetic mutations. These mutations impact factor I mRNA, leading to varied clinical presentations, from asymptomatic to recurrent infections.

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Area of Science:

  • Immunogenetics
  • Molecular Medicine
  • Biochemistry

Background:

  • Hereditary complement factor I deficiency is a rare genetic disorder affecting the immune system.
  • Complement factor I plays a crucial role in regulating the complement cascade, preventing excessive immune responses.
  • Understanding the molecular basis of this deficiency is key to diagnosing and potentially treating associated infections.

Purpose of the Study:

  • To elucidate the molecular basis of hereditary complement factor I deficiency in two distinct pedigrees.
  • To identify specific genetic mutations responsible for complement factor I deficiency.
  • To correlate genotype with clinical phenotype in affected individuals.

Main Methods:

  • Analysis of complement factor I mRNA using reverse transcription and polymerase chain reaction (RT-PCR).
  • DNA sequencing to identify specific nucleotide substitutions and splice site mutations.
  • Genotyping of affected individuals within two pedigrees.

Main Results:

  • Identified a transversion mutation (adenine to thymine at nucleotide 1282) in both siblings of the first pedigree, leading to a histidine-400 to leucine substitution.
  • The proband of the second pedigree was a compound heterozygote, carrying the same transversion mutation on one allele.
  • The second allele in the second pedigree exhibited a donor splice site mutation, causing the deletion of exon 5 (encoding a low-density lipoprotein receptor domain) from the transcript.

Conclusions:

  • Specific mutations in the complement factor I gene underlie hereditary deficiency.
  • The identified mutations, including a missense mutation and a splice site mutation, disrupt factor I function.
  • Genotype-phenotype correlations highlight the importance of complement factor I in preventing pyogenic infections.