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Bone Marrow Failure v1.79 TCN2 Zornitza Stark Marked gene: TCN2 as ready
Bone Marrow Failure v1.79 TCN2 Zornitza Stark Gene: tcn2 has been classified as Green List (High Evidence).
Bone Marrow Failure v1.63 TCN2 Chirag Patel Classified gene: TCN2 as Green List (high evidence)
Bone Marrow Failure v1.63 TCN2 Chirag Patel Gene: tcn2 has been classified as Green List (High Evidence).
Bone Marrow Failure v1.63 TCN2 Chirag Patel Classified gene: TCN2 as Green List (high evidence)
Bone Marrow Failure v1.63 TCN2 Chirag Patel Gene: tcn2 has been classified as Green List (High Evidence).
Bone Marrow Failure v1.62 TCN2 Chirag Patel 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
Added comment: 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 list