Bone Marrow Failure
Gene: TCN2
26 pathogenic TCN2 variants have been reported in over 40 individuals; Bi-allelic (deletions, insertions, nonsense, mutations) variants have been reported; multiple mouse models
Transcobalamin II deficiency is characterised by early onset (infancy) failure to thrive, megaloblastic anaemia, immunodeficiency and pancytopaenia. Other features include methylmalonic aciduria, recurrent infections, hypogammaglobulinaemia, pallor, hypotonia and vomiting and diarrhoea. Treatment with cobalamin (B12) may be of clinical benefit, but left untreated may result in intellectual disability and neurologic abnormalities.
Sources: Expert listCreated: 12 Dec 2023, 10:22 p.m.
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
Transcobalamin II deficiency, MIM#275350
Publications
Variants in this GENE are reported as part of current diagnostic practice
Gene: tcn2 has been classified as Green List (High Evidence).
Gene: tcn2 has been classified as Green List (High Evidence).
Gene: tcn2 has been classified as Green List (High Evidence).
gene: TCN2 was added gene: TCN2 was added to Bone Marrow Failure. Sources: Expert list Mode of inheritance for gene: TCN2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: TCN2 were set to PMID: 24305960, 7980584, 7849710, 20352340, 18956254, 32841161, 33023511, 30124850 Phenotypes for gene: TCN2 were set to Transcobalamin II deficiency, MIM#275350 Review for gene: TCN2 was set to GREEN gene: TCN2 was marked as current diagnostic