Korean J Pediatr.  2009 Jun;52(6):721-724. 10.3345/kjp.2009.52.6.721.

A Korean familial case of hereditary complement 7 deficiency

• Kim MK
• Lee KY
• Lee JH

• KMID: 2281081
• DOI: http://doi.org/10.3345/kjp.2009.52.6.721

Abstract

Meningococcal infections can be associated with abnormalities of the complement system, which contains 5 terminal complement proteins. Furthermore, deficiencies in 1 of these 5, complement component 7 (C7), leads to the loss of complement lytic function, and affected patients show increased susceptibility to recurrent meningococcal meningitis and systemic Neisseria gonorrhoeae infection. In September 2003, an 11-year-old female patient presented at our outpatient department with high fever, lower leg pain, headache, and petechiaes. She rapidly progressed to coma but later achieved full recovery due to prompt treatment. Her final diagnosis was meningococcal sepsis and arthritis. Her elder brother also had a similar bacterial meningoencephalitis history, which encouraged us to perform analyses for complement component and gene mutations. Resultantly, both the brother and sister were found to have the same mutation in the C7 gene. Subsequently, vaccinations of the meningococcal vaccine meningococcal vaccine (Menomune(R)) were administered. However, in September 2006, the brother expired due to acute micrococcus meningoencephalitis. At present, the 16-year-old female patient is healthy. Here, we report a Korean family with a hereditary C7 deficiency with susceptibility to meningococcal infections due to C7 gene mutation.

Keyword

Meningococcal infection; Complement 7 deficiency; Korean; C7 gene mutation; Meningococcal vaccine

MeSH Terms

Adolescent
Arthritis
Child
Coma
Complement C7
Complement System Proteins
Female
Fever
Headache
Humans
Immunologic Deficiency Syndromes
Leg
Meningitis, Meningococcal
Meningococcal Infections
Meningococcal Vaccines
Meningoencephalitis
Micrococcus
Neisseria gonorrhoeae
Outpatients
Sepsis
Siblings
Vaccination
Complement C7
Complement System Proteins
Immunologic Deficiency Syndromes
Meningococcal Vaccines