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Yusoff NM, Van Rostenberghe H, Shirakawa T, Nishiyama K, Amin N, Darus Z, Zainal N, Isa N, Nozu H, Matsuo M. High prevalence of Southeast Asian ovalocytosis in Malays with distal renal tubular acidosis. J Hum Genet 2003; 48:650-653. [PMID: 14618420 DOI: 10.1007/s10038-003-0095-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2003] [Accepted: 09/26/2003] [Indexed: 11/26/2022]
Abstract
Southeast Asian ovalocytosis (SAO) is a red blood cell abnormality common in malaria-endemic regions and caused by a 27 nt deletion of the band 3 protein gene. Since band 3 protein, also known as anion exchanger 1, is expressed in renal distal tubules, the incidence of SAO was examined in distal renal tubular acidosis (dRTA) in Malays in Kelantan, Malaysia. Twenty-two patients with dRTA and 50 healthy volunteers were examined for complication of SAO by both morphological and genetic analyses. SAO was identified in 18 of the 22 dRTA patients (81.8%), but only two of the 50 controls (4%). The incidence of SAO was significantly high in those with dRTA (p<0.001), indicating a dysfunctional role for band 3 protein/anion exchanger 1 in the development of dRTA.
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Affiliation(s)
- Narazah Mohd Yusoff
- Human Genome Center, School of Medical Science, Health Campus, University Sains Malaysia, Kelantan, Malaysia
| | - Hans Van Rostenberghe
- Human Genome Center, School of Medical Science, Health Campus, University Sains Malaysia, Kelantan, Malaysia
| | - Taku Shirakawa
- Faculty of Health Science, Kobe University School of Medicine, Kobe, Japan
| | - Kaoru Nishiyama
- Faculty of Health Science, Kobe University School of Medicine, Kobe, Japan
| | - Noryati Amin
- Human Genome Center, School of Medical Science, Health Campus, University Sains Malaysia, Kelantan, Malaysia
| | - Zainal Darus
- Human Genome Center, School of Medical Science, Health Campus, University Sains Malaysia, Kelantan, Malaysia
| | - Nik Zainal
- Human Genome Center, School of Medical Science, Health Campus, University Sains Malaysia, Kelantan, Malaysia
| | - Nizam Isa
- Human Genome Center, School of Medical Science, Health Campus, University Sains Malaysia, Kelantan, Malaysia
| | - Hiroyuki Nozu
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunokicho, Chuo, Kobe 650-0017, Japan
| | - Masafumi Matsuo
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunokicho, Chuo, Kobe 650-0017, Japan.
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Sapak P, Sleigh A, Williams G, Peter W, Ginny M, Waranduo M. Measurement of ovalocyte frequency in peripheral blood smears in defining ovalocytosis in Papua New Guinea. Trop Med Int Health 1998; 3:809-17. [PMID: 9809914 DOI: 10.1046/j.1365-3156.1998.00308.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Red cell oval morphology is still the only accepted basis for the clinical or epidemiological diagnosis of ovalocytosis. Therefore it is important to know the errors when detecting and counting morphological ovalocytes. In all previous studies of ovalocytosis there was no assessment of the variation which may have occurred in classification due to smearing and staining techniques or the criteria for the diagnosis of ovalocyte morphology; nor was inter or intraobserver variation assessed. We report how different peripheral blood smear methods influence the diagnosis of ovalocytosis in populations in the Madang and East Sepik Provinces in Papua New Guinea. We also examined within and between observer variation in the quantitative assessment of ovalocytosis at x 40 and x 100 microscopy powers. A modified method of making a thin malaria blood smear gave the best preservation of red cell morphology and was adopted for the quantitative ovalocytosis studies. A special haematology smear is unnecessary. Ovalocyte frequency estimations were similar when x 40 and x 100 lenses were used, but x 40 was preferable for assessing morphology. Two observers were consistent in their findings and produced very similar results for the high-quality smears from the planned Madang survey, and rather different results for the smears from the unplanned routine Sepik survey. We conclude that measurement error for ovalocytosis assessment can be quite small and unimportant, minimized by careful planning and quality control. Otherwise measurement error is substantial and threatens validity of classification and grading of ovalocytosis.
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Affiliation(s)
- P Sapak
- Department of Community Medicine, University of Papua New Guinea, Boroko
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