[Ring sideroblasts and iron metabolism].

Area of Science:

• Hematology
• Molecular Biology
• Genetics

Background:

• Ring sideroblasts, characterized by mitochondrial iron accumulation, are hallmarks of sideroblastic anemias (SAs).
• SAs encompass diverse congenital and acquired conditions, including those linked to genetic mutations, toxic exposures, and myelodysplastic syndromes.
• Somatic mutations in SF3B1 are frequently observed in idiopathic SA, implicating RNA splicing defects.

Purpose of the Study:

• To review the current understanding of sideroblastic anemia pathophysiology.
• To elucidate the mechanisms underlying ring sideroblast formation in congenital and acquired SAs.
• To discuss the common defects in iron/heme metabolism contributing to SA.

Main Methods:

• Literature review of recent reports and existing studies on sideroblastic anemias.
• Analysis of genetic and molecular mechanisms involved in SA pathogenesis.
• Discussion of iron and heme metabolism pathways relevant to ring sideroblast formation.

Main Results:

• Congenital SAs stem from mutations in heme biosynthesis, iron-sulfur cluster synthesis, or mitochondrial protein synthesis.
• Acquired SAs can result from drug/alcohol exposure, copper deficiency, or myelodysplastic syndromes.
• Common defects in iron/heme metabolism are implicated in ring sideroblast formation across SA subtypes.

Conclusions:

• Ring sideroblast formation is a central feature of SA pathophysiology, driven by diverse underlying causes.
• Understanding the shared mechanisms of iron dysregulation is crucial for SA research.
• This review synthesizes current knowledge on SA, highlighting key molecular and metabolic pathways.