Red cell disorders

Gene: STEAP3

Red List (low evidence)

Single family reported only with (p.Cys100Ter) variant and a hypomorphic allele; Steap3/Tsap6 null mice model.

The 3 siblings presented with transfusion-dependent hypochromic microcytic anaemia with iron overload. Other features present were hepatosplenomegaly, low serum ferritin, and blood smears revealed distinct aniso-poikilocytosis with hypochromasia, microcytosis and ovalocytes.

Conflicting evidence (PMID 26675350): Large Chinese study (of normal and α-thalassemia subjects) investigated the prevalence of STEAP3 mutations in humans and their physiologic consequences. Discovered a relatively high prevalence of potentially harmful recessive alleles. However, whilst the identified STEAP3 mutations exhibited impaired ferrireductase activity in vitro, they had little or no effect on erythrocyte phenotypes

Created: 14 Sep 2021, 4:12 a.m. | Last Modified: 14 Sep 2021, 4:12 a.m.

Panel Version: 0.128

Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted

Phenotypes
Anaemia, hypochromic microcytic, with iron overload 2 MIM# 615234

Publications

• 22031863
• 25515317
• 26675350