A novel nonsense RPS26 mutation in a patient with Diamond-Blackfan anemia: a case report.

Background: Diamond-Blackfan anemia is a rare congenital disorder characterized by erythroid hypoplasia and is associated with mutations in ribosomal protein genes. This case report describes a novel variant in the RPS26 gene, which, to our knowledge, has not been previously documented. Reporting this case adds to the understanding of Diamond-Blackfan anemia's genetic diversity and phenotypic manifestations.

Case presentation: A 16-month-old Turkish girl presented with pallor and macrocytosis. There was no familial history of anemia. Hemoglobin electrophoresis showed hemoglobin F at 10.8%, hemoglobin A2 at 1.7%, and hemoglobin A at 87.5% (normal range 0-2%). Peripheral smear demonstrated macrocytosis and reticulocytopenia. Bone marrow examination revealed marked erythroid hypoplasia and dyserythropoiesis. Targeted next-generation sequencing, which included genes such as RPL11, RPL15, RPL26, RPL35A, RPL5, RPS10, RPS17, RPS19, RPS24, RPS26, RPS28, RPS29, RPS7, and TSR2, identified a heterozygous c.221G>T (p.C74F) variant in the RPS26 gene. This variant is reported here for the first time.

Conclusions: The identification of the c.221G>T (p.C74F) variant in RPS26 provides new insights into the genetic underpinnings of Diamond-Blackfan anemia. This finding underscores the importance of genetic testing in diagnosing Diamond-Blackfan anemia and highlights the potential for new mutations to contribute to the clinical presentation of the disease. Further research into RPS26 mutations may enhance the understanding of Diamond-Blackfan anemia's pathogenesis and lead to improved diagnostic and therapeutic strategies.