Alpha 1 Antitrypsin Deficiency in Infants with Neonatal Cholestasis

authors:

avatar Maryam Monajemzadeh 1 , * , avatar Reza Shahsiah 2 , avatar Mohammad Vasei 3 , avatar Parin Tanzifi 4 , avatar Nima Rezaei 5 , avatar Mehri Najafi 6 , avatar Narjes Soleimanifar 7 , avatar Maryam Eghbali 8

Iranian Journal of Pediatrics: Vol.23, issue 5; 501-507
published online: July 21, 2013
article type: Research Article
received: January 10, 2013
accepted: May 21, 2013

how to cite: Monajemzadeh M, Shahsiah R, Vasei M, Tanzifi P, Rezaei N, et al. Alpha 1 Antitrypsin Deficiency in Infants with Neonatal Cholestasis. Iran J Pediatr. 2013;23(5): 501-507. 

Abstract

Objective: Alpha1-antitrypsin deficiency (A1ATD) is the most important indication for liver transplantation in children. The gene frequencies vary in different ethnic groups. In the present study, we attempt to determine the frequencies of the most common defective alleles, Z and S, in Iranian children suffering from idiopathic neonatal cholestasis. Eighty-seven infants were typed for Z and S alleles. Methods: In a single center study, 87 consecutive liver biopsies from infants with cholestasis were reviewed and patients with neonatal cholestasis enrolled in the study and cases with confirmed biliary tract atresia excluded. Formalin fixed paraffin embedded blocks were used for DNA extraction. AAT genotype was determined by polymerase chain reaction (PCR) assay and amplification of the two most common deficiency variants, S and Z alleles, and then sequencing of PCR products. Findings: There were 48 (55.2%) males and 39 (44.8%) females, with a median age of 60 days. Out of 87 of the study subject, 2 (2.2%) were heterozygous for the S allele, and no ZZ, SS or MZ individual was found in the patients. No other polymorphism was found in the sequencing results. Conclusion: In comparison to other populations, AAT deficiency seems not to be an important etiologic factor for neonatal cholestatic liver disease in Iran; however, further studies are recommended to estimate the true mutant gene frequencies.
 

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