title: Hereditary C1q deficiency: a new family with C1qA deficiency.
abstract: Hereditary deficiency of complement component C1q is a rare genetic disorder with susceptibility to recurrent infections with polysaccharide-containing encapsulated microorganisms and a high prevalence of autoimmune diseases, most often systemic lupus erythematosus (SLE). Here, we report a 29-month-old boy who presented with facial rash and history of early death of a sibling with infections, who was found to have a selective deficiency of C1q. The facial rash was composed of patchy erythematous plaques and centrally hypopigmented macules and desquamation. Two siblings had died of severe bacterial infections and his uncle had died of meningitis. Molecular study disclosed a homozygous point mutation in the C1qA chain gene. Five members of the family, including the parents and three healthy siblings, were heterozygous for this mutation.
authors.affiliation: Division of Immunology, Department of Pediatrics, Hacettepe University, Faculty of Medicine, Ankara, Turkey.
authors.forename: Cağman
authors.initials: C
authors.lastname: Sun-Tan
authors.forename: Tuba Turul
authors.initials: TT
authors.lastname: Ozgür
authors.forename: Gamze
authors.initials: G
authors.lastname: Kilinç
authors.forename: Rezan
authors.initials: R
authors.lastname: Topaloğlu
authors.forename: Ozay
authors.initials: O
authors.lastname: Gököz
authors.forename: Sibel
authors.initials: S
authors.lastname: Ersoy-Evans
authors.forename: Ozden
authors.initials: O
authors.lastname: Sanal
mesh_terms: D001796:Blood Protein Disorders / Q000235:genetics*; D002675:Child, Preschool; D015922:Complement C1q / Q000172:deficiency* / Q000235:genetics*; D003241:Consanguinity; D004198:Disease Susceptibility; D005148:Facial Dermatoses / Q000097:blood / Q000235:genetics*; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000097:blood / Q000235:genetics*; D008297:Male; D010375:Pedigree; D017354:Point Mutation
chemical_list: D015922:Complement C1q