Clinical significance of E148Q heterozygous variant in paediatric familial Mediterranean fever.
Rheumatology (Oxford)
; 60(11): 5447-5451, 2021 11 03.
Article
em En
| MEDLINE
| ID: mdl-33560333
ABSTRACT
OBJECTIVES:
FMF results from mutations in the Mediterranean fever (MEFV) gene. The p. E148Q protein alternation is one of the most frequent in the MEFV gene, yet the exact E148Q genotype-phenotype correlation remains unclear. The aim of this study was to examine clinical significance of heterozygous E148Q variant in a paediatric FMF cohort.METHODS:
We compared the clinical manifestations and disease severity score of four genetic subgroups (group 1) patients harbouring a single heterozygous p. E148Q variant (n = 6); (group 2) patients harbouring a single p. M694V heterozygous variant (n = 88); (group 3) patients harbouring compound heterozygous p. M694V and p. E148Q variants (n = 36); and (group 4) homozygotes for p. M694V variant (n = 160).RESULTS:
Of 646 FMF children from our centre, only 1% (six patients) of our genetically characterized FMF cohort had a single E148Q variant, most presenting with recurrent fevers and abdominal pain. None of the participants was found to harbour homozygous E148Q. Overall, M694V/E148Q compound heterozygosity did not exhibit a more severe phenotype compared with patients with a single M694V variant. The former group were less likely to have abdominal pain and exertional leg pain (P < 0.004 and P < 0.001, respectively) and more likely to have chest pain (P < 0.01). Both subgroups showed milder clinical phenotype compared with patients with M694V homozygosity.CONCLUSION:
Our findings demonstrate that a single heterozygous E148Q variant is unlikely to cause FMF in children and that E148Q/M694V is clinically indistinguishable from a single M694V variant. Thus, E148Q heterozygosity does not result in clinically meaningful phenotype in children.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Febre Familiar do Mediterrâneo
/
Pirina
Tipo de estudo:
Observational_studies
Limite:
Child
/
Child, preschool
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Rheumatology (Oxford)
Assunto da revista:
REUMATOLOGIA
Ano de publicação:
2021
Tipo de documento:
Article