Maryam Matar

Publications (3)3.29 Total impact

• Article: A New β(0)-Thalassemia Mutation (codon 102, AAC>ATCAC) in Coexistence with a Heterozygous P4.2 Nippon Gene.

  Chris Adhiyanto, Yasuhiro Yamashiro, Yukio Hattori, Takenori Nitta, Minako Hino, Maryam Matar, Fumiya Takagi, Masafumi Kimoto
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  ABSTRACT: A new β-thalassemia (β-thal) frameshift mutation was found at codon 102 (AAC>ATCAC) in a 17-year-old Japanese male and his 14-year-old sister. Both demonstrated a more severe phenotype than the usual β-thal minor with mild hemolytic involvement. No mRNA derived from the thalassemic allele, or β(T)mRNA, was detected in the sequencing analysis of the whole mRNA (cDNA). However, the β(T)mRNA from the whole βmRNA was specifically amplified by amplification refractory mutation system (ARMS), and was actually found to be present. Furthermore, quantitative polymerase chain reaction (q-PCR) demonstrated a negligible amount of β(T)mRNA. Thus, their more severe phenotype was not caused by the "dominant type" β-thal in which a considerable amount of the β(T)mRNA would be expected. In fact, our proband had a total βmRNA level that was mostly normal. Thus, the cause of a β-thal phenotype by the frameshift mutation was ascribed to the reduced amount of mRNA. We further searched for the cause of their severe phenotype. However, factors that exacerbated the phenotype of β-thal, such as α-globin gene triplication, coexisting iron deficiency and infection were not found. Finally, we noticed that the red cell morphology revealed ovalocytosis and small numbers of stomatocytes that were seen in the hereditary spherocytosis (HS), especially by P4.2 mutations. The sequence of the P4.2 gene disclosed heterozygous P4.2 Nippon, or missense mutation at codon 142 (GCT>ACT) on exon 3, the most common mutation of Japanese HS. Frequent mutations of other membrane proteins, Band 3 and ankyrin that are common cause of HS in the Japanese population, other than P4.2, were not detected. When HS by P4.2 Nippon develops it is homozygous, and no P4.2 protein is observed in sodium dodecilsulphate-polyacrylamide gel electrophoresis (SDS-PAGE), while in our case the amount of the P4.2 was almost normal in the SDS-PAGE. However, there are several reports that revealed more severe phenotypes of β-thal by the coexisting abnormality of membrane protein. It is uncertain, but the presence of heterozygous P4.2 Nippon may be associated with the exacerbation of the phenotype of β-thal minor.
  Hemoglobin 04/2013; · 1.30 Impact Factor
• Article: Identification of a novel mutation in the β-globin gene 3' untranslated region [+1,506 (A>C)] in a Japanese male with a heterozygous β-thalassemia phenotype.

  Minako Hino, Yasuhiro Yamashiro, Yukio Hattori, Hitomi Ito, Takenori Nitta, Chris Adhiyanto, Maryam Matar, Mohammed Naveed
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  ABSTRACT: β-Thalassemia (β-thal) is characterized by the absent or reduced production of β-globin chains. The precise molecular lesion that causes decreased β-globin synthesis in β(+)-thal is difficult to predict when mutations occur in the locus control region (LCR), the promoter, the introns or 3' untranslated regions (3'UTRs). Among them, the role of the 3'UTR of β-globin gene in mRNA stability is poorly understood, mainly due to very few cases that have mutations in this region. So far, only three mutations have been reported in the 3'UTR of β-globin gene. Although, it is speculated that some of these reported mutations could be associated with mRNA stability, the precise molecular basis still remains unclear. We report here a novel mutation in the β-globin gene 3'UTR [+1,506 (A>C)] in a 31-year-old Japanese male with hematological parameters suggestive of heterozygous β-thal. Further functional studies on this novel mutation reported here, may help in understanding of the regulation and expression of the β-globin gene and its products.
  Hemoglobin 01/2012; 36(2):170-6. · 1.30 Impact Factor
• Article: Internet-based approach to population screening for common hemoglobinopathies in United Arab Emirates.

  Maryam Matar, Mohammed Naveed, Sajala Salim, Nevin Hareb, Emayla Alba, Minako Hino, Takenori Nitta, Chris Adhiyanto, Yasuhiro Yamashiro, Yukio Hattori
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  ABSTRACT: This article reports on efforts to overcome common hurdles that were faced during population-based screening for common hemoglobinopathies in the United Arab Emirates. An Internet-based approach was designed and implemented to increase the acceptance of the screening program. The process involved: an awareness campaign, a simple bilingual (Arabic/English) online consent form and registration process, the use of a barcode for sample labeling, an equipment upgrade, electronic communication of a successful registration process, test results, and a counseling process. Before the implementation of the Internet-based system, great concern was noted among the clients in terms of the availability of accurate and timely test results, the need for pretest and post-test counseling, and the way that their personal health information was handled. Lapses in information exchange between the clients who participated in the screening program for the carrier state of inherited disorders and the screening laboratory posed significant challenges. The emphasis on confidentiality and the ease of access to services was instrumental in increasing the level of acceptance of these services in our community. Based on an analysis of > 10,000 samples, we conclude that Internet-based reporting holds much promise for improving the quality of care that clients receive.
  Nursing and Health Sciences 06/2011; 13(2):105-13. · 0.68 Impact Factor