title: Mutation spectra of the ITGB2 gene in Iranian families with leukocyte adhesion deficiency type 1.
abstract: Leukocyte adhesion deficiency type 1 (LAD1) is an autosomal recessive disorder clinically characterized by severe, recurrent bacterial infections, impaired pus formation and wound healing. It is caused by mutation in the ITGB2 gene, encoding the β2 integrin subunit of the leukocyte adhesion cell molecule. This study aimed to identify disease causing mutations in 19 consanguineous families diagnosed with LAD1. Blood samples were collected after informed and written consent was obtained. Genomic DNA was extracted from peripheral blood of patients and their parents. PCR amplification of the ITGB2 gene was done using specific primers followed by sequencing for mutation detection. A total number of 14 alterations scattered throughout the ITGB2 gene were ascertained in which 10 mutations were previously reported, including c.329-6C>A, c.382G>T, c.715G>A, c.843delC, c.897+1G>A, c.1062A>T, c.1143delC, c.1877+2T>C, c.1907delA and c.2147G>C. Four novel likely pathogenic mutations consisting of c.576dupC (Asn193GlnfsX72), c.706G>A (Gly236Arg), c.897+1G>T and c.1030G>T (Glu344(∗)), were identified. The majority of these mutations were located in exon six, suggesting this exon as a hotspot region probably. This study emphasis on allelic heterogeneity of the ITGB2 gene in Iranian patients diagnosed with LAD1. Our results suggest that every population should develop a mutation database for rare genetic disorders to take advantage in genetic counseling clinic as well as genetic testing for rapid diagnostic purposes.
authors.affiliation: Genomic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Dept. of Medical Genetics, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Vahid Reza
authors.initials: VR
authors.lastname: Yassaee
authors.affiliation: Genomic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Electronic address: f.hashemi-grc@sbmu.ac.ir.
authors.forename: Feyzollah
authors.initials: F
authors.lastname: Hashemi-Gorji
authors.affiliation: Dept. of Medical Genetics, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Sara
authors.initials: S
authors.lastname: Boosaliki
authors.affiliation: Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Nima
authors.initials: N
authors.lastname: Parvaneh
mesh_terms: D018821:CD18 Antigens / Q000235:genetics*; D003241:Consanguinity; D004252:DNA Mutational Analysis; D005091:Exons / Q000235:genetics; D005787:Gene Frequency; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D007492:Iran; D018370:Leukocyte-Adhesion Deficiency Syndrome / Q000235:genetics* / Q000276:immunology; D009154:Mutation / Q000235:genetics*; D010375:Pedigree; D011110:Polymorphism, Genetic
chemical_list: D018821:CD18 Antigens
keywords: ITGB2; Immunodeficiency; Leukocyte adhesion deficiency type 1; Mutation