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Research

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The article by Pluvinage et al (published in Sci. Transl. Med. 2024; 16:eadl3758) explores a novel autoimmune cause of vitamin B12 deficiency in the central nervous system (CNS), termed "Autoimmune B12 Central Deficiency" (ABCD). Researchers from San Francisco discovered autoantibodies targeting the transcobalamin receptor (CD320), a key protein in vitamin B12 transport, impairing B12 uptake into the brain despite normal serum B12 levels.
The authors have used phage display technology, and demonstrated the presence of a specific autoantibody against the CD320 receptor in a patient with poorly understood progressive neurological symptoms (e.g., tremor, ataxia, speech issues). It was observed that the autoantibody blocks B12 uptake into the brain, causing B12 deficiency in nervous tissue and leading to a variety of neurological symptoms. 
CD320 antibodies were also found in other patients with unexplained neurological deficits, neuropsychiatric lupus (21.4% prevalence), and some healthy controls (6% prevalence).
A genome-wide CRISPR screen revealed that an alternate pathway via LDL receptors compensates for CD320 loss in hematopoietic cells but not in the CNS, explaining the tissue-specific effects.
In the index patient, high-dose systemic vitamin B12 supplementation and immunosuppressive therapy showed improvements in CSF B12 levels and clinical symptoms. Larger studies are needed to explore the prevalence and long-term effects of these autoantibodies in people with symptoms suggestive of B12 deficiency, and the therapeutic role of B12 in neuropsychiatric disorders.

Link to our paper on B12 in plant-based diets
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A broad discussion of all aspects of diagnosis and treatment of vitamin B12 deficiency

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Our paper on diagnostics and therapeutics of vitamin B12 deficiency, with emphasis on patient experiences, written on request of the BMJ Editorial Board

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Vitamin B12 Deficiency in Clinical Practice: Scientific Insights at the Bookends of Life-Proceedings of the First International B12 Conference, June 2023, Rotterdam'
The supplement consists of 88 pages and 14 peer-reviewed manuscripts published by the Food and Nutrition Bulletin 2024/ Supplement June 2024.

It can be found here:

https://journals.sagepub.com/toc/fnba/45/1_suppl

The congress organisers and authors hope that these publications will lead to a better understanding and knowledge of the complex spectrum of B12 deficiencies.

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