Two Novel TMPRSS6 Variants in a Compound Heterozygous Child With Iron Refractory Iron Deficiency Anemia

Area of Science:

• Genetics
• Hematology
• Molecular Biology

Background:

• Microcytic anemia is a common finding in pediatric populations.
• Iron deficiency anemia is the most frequent cause, but refractory cases warrant further investigation.
• Genetic factors can influence iron metabolism and red blood cell production.

Observation:

• A Caucasian family presented with a daughter diagnosed with unexplained microcytic anemia at 12 months.
• The anemia was unresponsive to standard iron supplementation, suggesting an iron-refractory form.
• Genetic analysis was performed due to the persistent and unexplained nature of the anemia.

Findings:

• The proband was found to be a compound heterozygote for two previously unreported variants in the TMPRSS6 gene.
• TMPRSS6 (Transmembrane Serine Protease 6) plays a crucial role in regulating hepcidin, a key iron-regulatory hormone.
• These novel variants likely impair TMPRSS6 function, leading to dysregulation of iron homeostasis.

Implications:

• This case expands the known spectrum of TMPRSS6 mutations associated with iron refractory anemia.
• Identification of novel variants aids in genetic diagnosis and counseling for families with unexplained anemia.
• Understanding the molecular basis of these variants can inform potential therapeutic strategies for similar conditions.