en علوم مولکولی Molecular Sciences تحقیقی Original article <div style="text-align: justify;"><strong><em>Background and objective</em></strong>: Glucose 6-phosphate dehydrogenase (G6PD) deficiency is one of the most common human diseases with approximately 400 million people affected worldwide. G6PD Chatham is caused by 1003 G>A mutation leads to a severe enzymatic deficiency. The aim of the present study is to investigate the frequency rate of the Chatham mutations in the population of the North-West of Iran.<br> <strong><em>Material And Method:</em></strong> In this study, by Rapid Genomic DNA Extraction (RGDE) method, from 90 peripheral blood samples of unrelated male and female patients with genetic deficiency of G6PD, DNA was extracted and after digestion by <em>Bstx1 </em>enzymes, in order to search for Chatham mutation, they were analyzed by means of PCR-RFLP and sequencing methods.<br> <em><strong>Result:</strong></em> According to the results, Chatham mutation was observed in 10 samples (11.11%).<br> <strong><em>Conclusion:</em></strong> This study showed that G6PD Chatham (1003 G>A) mutation is the second common mutation, after Mediterranean (563C>T), in the population of the North-West of Iran. Further studies are recommended to identify the mutation type of other varieties.<br> &nbsp;</div> Glucose 6-phosphate dehydrogenase (G6PD),Chatham mutation,PCR-RFLP method,Sequencing, 27 35 http://goums.ac.ir/jorjanijournal/browse.php?a_code=A-10-754-1&slc_lang=en&sid=1 Habib Onsori onsori1356@yahoo.com 10031947532846005996 10031947532846005996 No Cellular and Molecular Biology Department, Marand Branch, Islamic Azad University, Marand, Iran Davood Poladi mehdi.valizadeh20@gmail.com 10031947532846005997 10031947532846005997 No Department Genetics, Ahar Branch, Islamic Azad University, Ahar, Iran Mehdi Valizadeh mehdi_valizadeh65@yahoo.com 10031947532846005998 10031947532846005998 Yes Unit of Genomics Research, Digestive Diseases Research Center, Ardabil University of Medical Sciences, Ardabil, Iran Afshin Fathi a.fathi@arums.ac.ir 10031947532846005999 10031947532846005999 No Pediatric Hematology & Oncology Department, Ardabil University of Medical Sciences, Ardabil, Iran Mahshid Damandan m.damandan@yahoo.com 10031947532846006000 10031947532846006000 No Center for Cell Pathology Research, Department of Life Science, Khazar University, Baku, Azerbaijan/Cellular and Molecular Research Center, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran Rouhallah Moradpour moradpoormehran@ymail.com 10031947532846006001 10031947532846006001 No Cellular and Molecular Research Center, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran/Center for Cell Pathology Research, Department of Life Science, Khazar University, Baku, Azerbaijan