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Updated: May 22, 2026
In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
Published on: August 20, 2019
Methemoglobin reductase deficiency: novel mutation is associated with a disease phenotype of intermediate severity
Melanie J Percy1, Chris Barnes, Gemma Crighton
1Department of Haematology, Belfast City Hospital, Belfast, Northern Ireland. melanie.percy@belfasttrust.hscni.net
Background:
Cytochrome b5 reductase (CB5R) deficiency is a recessively inherited autosomal disorder that is either benign (type I) or associated with severe neurological problems (type II). Specific mutations in the CYB5R gene are not exclusive to each type.
Observation:
Two cyanotic children with developmental delay but with slow progression were investigated for CB5R deficiency. A novel mutation, p.Arg58Pro, was independently detected in both cases.
Conclusions:
The clinical variability and severity of the disease reflect the combined effects of impaired function of the 2 mutant enzymes. As illustrated by these 2 cases, inheritance of p.Arg58Pro with either p.Gly76Ser or pLeu188del causes a clinical condition more severe than type I and less severe than the type II cases reported to date.
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