Three novel homozygous ITGB2 mutations among two patients with leukocyte adhesion defect type-1: Two case reports
Issued Date
2022-09-09
Resource Type
ISSN
22192808
Scopus ID
2-s2.0-85140996344
Journal Title
World Journal of Clinical Pediatrics
Volume
11
Issue
5
Start Page
429
End Page
436
Rights Holder(s)
SCOPUS
Bibliographic Citation
World Journal of Clinical Pediatrics Vol.11 No.5 (2022) , 429-436
Suggested Citation
Suksawat Y., Pacharn P., Siripipattanamongkol N., Boonyawat B. Three novel homozygous ITGB2 mutations among two patients with leukocyte adhesion defect type-1: Two case reports. World Journal of Clinical Pediatrics Vol.11 No.5 (2022) , 429-436. 436. doi:10.5409/wjcp.v11.i5.429 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/87244
Title
Three novel homozygous ITGB2 mutations among two patients with leukocyte adhesion defect type-1: Two case reports
Author's Affiliation
Other Contributor(s)
Abstract
BACKGROUND A leukocyte adhesion defect (LAD) is a rare primary immunodeficiency disorder. LAD type 1 (LAD-1) is the most common, which is caused by ITGB2 mutation resulting in dysfunction of β2 integrin, which impairs leukocyte adherence to the endothelium. CASE SUMMARY The first two cases of LAD-1 in Thailand presented with recurrent omphalitis, soft tissue infection, marked leukocytosis, and neutrophilia. One patient experienced delayed umbilical cord separation. Mutation analysis was performed by direct DNA sequencing of the ITGB2 gene. The results revealed two novel homozygous missense mutations, c.920C>T (p.Leu307Pro) in exon 8 and c.758G>A (p.Arg-253His) in exon 7, and one novel homozygous nonsense mutation, c.262C>T (p.Gln88Ter) in exon 4, in the genomic DNA of the first and second patients, respectively. Heterozygous mutations were identified in the parents of both patients, suggesting a carrier status. The patients were administered intravenous antibiotics for infections with good clinical responses. Hematopoietic stem cell transplantation could not be performed due to the unavailability of matched donors. However, a significant decline in infections was observed after antibiotic prophylaxis. Several follow-up visits were conducted for both patients. They are currently 6 years old. CONCLUSION Molecular analysis is essential for definitive diagnosis, early treatment implementation, and prevention of LAD-1 in future pregnancy.