Novel compound heterozygous variants of TBXAS1 presenting with Ghosal hematodiaphyseal dysplasia treated with steroids
Abstract Background Homozygous or compound heterozygous pathogenic variants in the thromboxane A synthase 1 (TBXAS1) gene are associated with Ghosal hematodiaphyseal dysplasia (GHDD) which is characterized by defective hematopoiesis and increased bone density of long bones. Methods Patients 1 and 2...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-03-01
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| Series: | Molecular Genetics & Genomic Medicine |
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| Online Access: | https://doi.org/10.1002/mgg3.1494 |
| _version_ | 1818457658970079232 |
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| author | Sun Young Kim Alexander Ing Shunyou Gong Kai Lee Yap Rukhmi Bhat |
| author_facet | Sun Young Kim Alexander Ing Shunyou Gong Kai Lee Yap Rukhmi Bhat |
| author_sort | Sun Young Kim |
| collection | DOAJ |
| description | Abstract Background Homozygous or compound heterozygous pathogenic variants in the thromboxane A synthase 1 (TBXAS1) gene are associated with Ghosal hematodiaphyseal dysplasia (GHDD) which is characterized by defective hematopoiesis and increased bone density of long bones. Methods Patients 1 and 2 are identical twins, who presented with red blood cell transfusion‐dependent normocytic anemia and thrombocytopenia with bone marrow fibrosis and cortical bone thickening of long bones on plain radiograph. To clarify the etiology of their anemia and thrombocytopenia, whole blood was used for the DNA extraction and analyzed using next‐generation sequencing (NGS) on an in‐house bone marrow failure syndrome panel. Results The NGS results indicated that these two patients carried two heterozygous variants in TBXAS1, exon7, c.583_584del, p.Ala195Leufs*12, and exon12, c.1420G>T, p.Gly474Trp, which were inherited from their mother and father, respectively. Patients 1 and 2 have been on chronic oral steroids with normalization of hemoglobin and platelet count after steroid initiation. Patient 3 is their sister who has normal blood counts but also has the same variants in TBXAS1 as her brothers. Radiographs showed cortical bone thickening and she has not required any treatment or transfusion. Conclusion We report three Caucasian siblings from non‐consanguineous parents with novel compound heterozygous variants of TBXAS1 presenting with the phenotypes of GHDD. These three cases illustrate the variable clinical expressivity of the GHDD from two‐compound heterozygous pathogenic variants of TBXAS1. |
| first_indexed | 2024-12-14T22:46:04Z |
| format | Article |
| id | doaj.art-89f557845c7242cf8e2032614a26feab |
| institution | Directory Open Access Journal |
| issn | 2324-9269 |
| language | English |
| last_indexed | 2024-12-14T22:46:04Z |
| publishDate | 2021-03-01 |
| publisher | Wiley |
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| series | Molecular Genetics & Genomic Medicine |
| spelling | doaj.art-89f557845c7242cf8e2032614a26feab2022-12-21T22:44:51ZengWileyMolecular Genetics & Genomic Medicine2324-92692021-03-0193n/an/a10.1002/mgg3.1494Novel compound heterozygous variants of TBXAS1 presenting with Ghosal hematodiaphyseal dysplasia treated with steroidsSun Young Kim0Alexander Ing1Shunyou Gong2Kai Lee Yap3Rukhmi Bhat4Department of Pediatrics Division of Hematology/Oncology/Stem Cell Transplant Ann and Robert H. Lurie Children's Hospital of ChicagoNorthwestern University Feinberg School of Medicine Chicago IL USADepartment of Pathology & Laboratory Medicine Ann and Robert H. Lurie Children’s Hospital of ChicagoNorthwestern University Feinberg School of Medicine Chicago IL USADepartment of Pathology & Laboratory Medicine Ann and Robert H. Lurie Children’s Hospital of ChicagoNorthwestern University Feinberg School of Medicine Chicago IL USADepartment of Pathology & Laboratory Medicine Ann and Robert H. Lurie Children’s Hospital of ChicagoNorthwestern University Feinberg School of Medicine Chicago IL USADepartment of Pediatrics Division of Hematology/Oncology/Stem Cell Transplant Ann and Robert H. Lurie Children's Hospital of ChicagoNorthwestern University Feinberg School of Medicine Chicago IL USAAbstract Background Homozygous or compound heterozygous pathogenic variants in the thromboxane A synthase 1 (TBXAS1) gene are associated with Ghosal hematodiaphyseal dysplasia (GHDD) which is characterized by defective hematopoiesis and increased bone density of long bones. Methods Patients 1 and 2 are identical twins, who presented with red blood cell transfusion‐dependent normocytic anemia and thrombocytopenia with bone marrow fibrosis and cortical bone thickening of long bones on plain radiograph. To clarify the etiology of their anemia and thrombocytopenia, whole blood was used for the DNA extraction and analyzed using next‐generation sequencing (NGS) on an in‐house bone marrow failure syndrome panel. Results The NGS results indicated that these two patients carried two heterozygous variants in TBXAS1, exon7, c.583_584del, p.Ala195Leufs*12, and exon12, c.1420G>T, p.Gly474Trp, which were inherited from their mother and father, respectively. Patients 1 and 2 have been on chronic oral steroids with normalization of hemoglobin and platelet count after steroid initiation. Patient 3 is their sister who has normal blood counts but also has the same variants in TBXAS1 as her brothers. Radiographs showed cortical bone thickening and she has not required any treatment or transfusion. Conclusion We report three Caucasian siblings from non‐consanguineous parents with novel compound heterozygous variants of TBXAS1 presenting with the phenotypes of GHDD. These three cases illustrate the variable clinical expressivity of the GHDD from two‐compound heterozygous pathogenic variants of TBXAS1.https://doi.org/10.1002/mgg3.1494anemiaGhosal hematodiaphyseal dysplasiaTBXAS1thromboxane synthase 1 |
| spellingShingle | Sun Young Kim Alexander Ing Shunyou Gong Kai Lee Yap Rukhmi Bhat Novel compound heterozygous variants of TBXAS1 presenting with Ghosal hematodiaphyseal dysplasia treated with steroids Molecular Genetics & Genomic Medicine anemia Ghosal hematodiaphyseal dysplasia TBXAS1 thromboxane synthase 1 |
| title | Novel compound heterozygous variants of TBXAS1 presenting with Ghosal hematodiaphyseal dysplasia treated with steroids |
| title_full | Novel compound heterozygous variants of TBXAS1 presenting with Ghosal hematodiaphyseal dysplasia treated with steroids |
| title_fullStr | Novel compound heterozygous variants of TBXAS1 presenting with Ghosal hematodiaphyseal dysplasia treated with steroids |
| title_full_unstemmed | Novel compound heterozygous variants of TBXAS1 presenting with Ghosal hematodiaphyseal dysplasia treated with steroids |
| title_short | Novel compound heterozygous variants of TBXAS1 presenting with Ghosal hematodiaphyseal dysplasia treated with steroids |
| title_sort | novel compound heterozygous variants of tbxas1 presenting with ghosal hematodiaphyseal dysplasia treated with steroids |
| topic | anemia Ghosal hematodiaphyseal dysplasia TBXAS1 thromboxane synthase 1 |
| url | https://doi.org/10.1002/mgg3.1494 |
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