[Molecular analysis of two cases of severe congenital neutropenia].
Severe congenital neutropenia is a rare hematological disease characterized by a selective decrease in circulating neutrophils, maturation arrest of granulocytic precursors at the promyelocyte stage, and recurrence of infections. A 2-month-old male infant (patient A) and a 14-month-old female child (patient B) were referred to our hospital due to severe neutropenia. Sequencing analysis of ELA2 and HAX1 genes was performed. Two single nucleotide polymorphisms of HAX1 gene were found. They were 5,104T-->G point mutation of exon 1 and 5,474A-->G point mutation of intron 1 in HAX1 gene. The mutation of ELA2 gene was not found. The patient A showed a good response to granulocyte colony-stimulating factor (G-CSF) treatment and the absolute neutrophil count recovered to 1,195/microL. But the patient B showed a partial response to G-CSF treatment and experienced several episodes of herpetic gingivostomatitis, oral ulcer, acute pharyngotonsillitis and otitis media during follow-up.
Park
Joonhong
J
Department of Laboratory Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
Kim
Myungshin
M
Lim
Jihyang
J
Kim
Yonggoo
Y
Cho
Bin
B
Park
Yeon Joon
YJ
Han
Kyungja
K
D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics; D001853:Bone Marrow / Q000473:pathology; D005260:Female; D016179:Granulocyte Colony-Stimulating Factor / Q000009:adverse effects / Q000627:therapeutic use; D006801:Humans; D007223:Infant; D008297:Male; D009503:Neutropenia / Q000151:congenital / Q000188:drug therapy / Q000235:genetics*; D009504:Neutrophils / Q000166:cytology / Q000473:pathology; D019226:Oral Ulcer / Q000209:etiology; D010033:Otitis Media / Q000209:etiology; D020641:Polymorphism, Single Nucleotide; D011994:Recombinant Proteins; D012697:Serine Endopeptidases / Q000235:genetics; D013283:Stomatitis, Herpetic / Q000209:etiology
D048868:Adaptor Proteins, Signal Transducing; C104759:HAX1 protein, human; D011994:Recombinant Proteins; D016179:Granulocyte Colony-Stimulating Factor; D012697:Serine Endopeptidases; C117309:pancreatic elastase II