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      Bloom's syndrome in a 12-year-old Iranian girl

      case-report

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          Abstract

          BACKGROUND:

          Bloom's syndrome, an autosomal recessive inherited disorder, belongs to the group of chromosomal breakage syndromes. The clinical diagnosis of BS is confirmed cytogenetically. Its frequency in the general population is unknown but it is common in eastern European Ashkenazi Jews.

          CASE REPORT:

          A 12-year-old girl was referred to us because of short stature. She was the second child of the first cousin marriage. She had a slender body frame, short stature, and microcephaly. Her face was long and narrow with prominent nose, and malar and mandibular hypoplasia. The spots of hyper and hypo pigmentation were observed in the trunk and limbs. Telangectasia spots were observed in some areas of the trunk. Additionally, generalized hirsutism was present in the whole body. Cytogenetic findings revealed an abnormality in the structural chromosome.

          CONCLUSION:

          This is the first BS case that has been reported in Iranian female population.

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          Most cited references10

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          Congenital telangiectatic erythema resembling lupus erythematosus in dwarfs; probably a syndrome entity.

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            Molecular genetics of Bloom's syndrome.

            Mutation of the Bloom's syndrome (BS) gene, BLM, results in genomic instability. As the first step toward positional cloning of the gene, tight linkage of BLM and FES at 15q26.1 was detected by genotyping affected in families in which the parents are cousins, so-called homozygosity mapping. Linkage disequilibrium between BLM and FES was detected in Ashkenazi Jews with BS, confirming the linkage results and supporting the hypothesis that the increased frequency of the BS mutation in the Ashkenazim is due to founder effect. The mutated BLM gene is inherited identical by descent in BS persons whose parents are cousins or Ashkenazi Jewish; in persons whose parents do not share a common ancestor, BLM can be mutant at different positions within the gene. In such persons, crossing-over within BLM can occur to form a functionally wild-type gene capable of correcting the mutant phenotype of BS cells. In half the cases in which such somatic intragenic recombination had occurred, reduction to homozygosity was detectable distal to BLM but not proximal to it. We localized the cross-over points in corrected cells to a 250 kb genomic segment and isolated therefrom a 4437 bp cDNA that encodes a 1417 amino acid protein homologous to the RecQ subfamily of DExH box-containing DNA and RNA helicases. The identification of BLM as a putative DNA helicase provides a new and powerful tool to investigate the primary defect in BS and the function of the BLM gene product in maintaining the integrity of the genome.
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              Bloom's syndrome. I. Genetical and clinical observations in the first twenty-seven patients.

              J German (1969)
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                Author and article information

                Journal
                Indian J Hum Genet
                IJHG
                Indian Journal of Human Genetics
                Medknow Publications (India )
                0971-6866
                1998-362X
                Sep-Dec 2008
                : 14
                : 3
                : 103-105
                Affiliations
                Genetic Research Center- Rehabilitation Comprehensive Center- Welfare Organization, Yazd, Iran
                Author notes
                Address for Correspondence: Neaimeh Tayebi, Genetic part, Shahid Fiazbakhsh Rehabilitation Comprehensive Center, Third Azadshar Square, Yazd, Iran. E-mail: ntayebi@ 123456yahoo.com
                Article
                IJHG-14-103
                10.4103/0971-6866.45003
                2840798
                20300305
                fda6c367-f0bc-4a7b-a372-85ba465c850e
                © Indian Journal of Human Genetics

                This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Categories
                Case Report

                Genetics
                flat malar region,microcephaly,thin and long face,small mandible,chromosomal instability,telangectasia,short stature,conjunctivitis

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