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Ren, B. Thiamine-responsive Megaloblastic Anemia Syndrome. Encyclopedia. Available online: (accessed on 14 June 2024).
Ren B. Thiamine-responsive Megaloblastic Anemia Syndrome. Encyclopedia. Available at: Accessed June 14, 2024.
Ren, Bruce. "Thiamine-responsive Megaloblastic Anemia Syndrome" Encyclopedia, (accessed June 14, 2024).
Ren, B. (2020, December 23). Thiamine-responsive Megaloblastic Anemia Syndrome. In Encyclopedia.
Ren, Bruce. "Thiamine-responsive Megaloblastic Anemia Syndrome." Encyclopedia. Web. 23 December, 2020.
Thiamine-responsive Megaloblastic Anemia Syndrome

Thiamine-responsive megaloblastic anemia syndrome is a rare condition characterized by hearing loss, diabetes, and a blood disorder called megaloblastic anemia.


genetic conditions

1. Introduction

Thiamine-responsive megaloblastic anemia syndrome is a rare condition characterized by hearing loss, diabetes, and a blood disorder called megaloblastic anemia. Megaloblastic anemia occurs when a person has a low number of red blood cells (anemia), and the remaining red blood cells are larger than normal (megaloblastic). The symptoms of this blood disorder may include decreased appetite, lack of energy, headaches, pale skin, diarrhea, and tingling or numbness in the hands and feet. Individuals with thiamine-responsive megaloblastic anemia syndrome begin to show symptoms of megaloblastic anemia between infancy and adolescence. This syndrome is called "thiamine-responsive" because the anemia can be treated with high doses of vitamin B1 (thiamine).

People with thiamine-responsive megaloblastic anemia syndrome develop hearing loss caused by abnormalities of the inner ear (sensorineural hearing loss)

during early childhood. It remains unclear whether thiamine treatment can improve hearing or prevent hearing loss.

Diabetes becomes apparent in affected individuals sometime between infancy and adolescence. Although these individuals develop diabetes during childhood, they do not have the form of the disease that develops most often in children, called type 1 (autoimmune) diabetes. People with thiamine-responsive megaloblastic anemia syndrome usually require insulin to treat their diabetes. In some cases, treatment with thiamine can reduce the amount of insulin a person needs.

Some individuals with thiamine-responsive megaloblastic anemia syndrome develop optic atrophy, which is the degeneration (atrophy) of the nerves that carry information from the eyes to the brain. Heart and blood vessel (cardiovascular) problems such as heart rhythm abnormalities and heart defects have also been reported in some people with this syndrome.

2. Frequency

Thiamine-responsive megaloblastic anemia syndrome has been reported in approximately 30 families worldwide. Its prevalence is unknown.

3. Causes

Mutations in the SLC19A2 gene cause thiamine-responsive megaloblastic anemia syndrome. This gene provides instructions for making a protein called thiamine transporter 1, which transports thiamine into cells. Thiamine is found in many different foods and is important for numerous body functions.

Most mutations in the SLC19A2 gene lead to the production of an abnormally short, nonfunctional thiamine transporter 1. Other mutations change single protein building blocks (amino acids) in this protein. All of these mutations prevent thiamine transporter 1 from bringing thiamine into the cell. It remains unclear how the absence of this protein leads to the seemingly unrelated symptoms of megaloblastic anemia, diabetes, and hearing loss. Research suggests that an alternative method for transporting thiamine is present in all the cells of the body, except where blood cells and insulin are formed (in the bone marrow and pancreas, respectively) and cells in the inner ear.

3.1 The gene associated with Thiamine-responsive megaloblastic anemia syndrome

4. Inheritance

This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

5. Other Names for This Condition

  • Rogers syndrome
  • Thiamine-responsive myelodysplasia
  • TRMA


  1. Baron D, Assaraf YG, Cohen N, Aronheim A. Lack of plasma membrane targeting ofa G172D mutant thiamine transporter derived from Rogers syndrome family. Mol Med.2002 Aug;8(8):462-74.
  2. Diaz GA, Banikazemi M, Oishi K, Desnick RJ, Gelb BD. Mutations in a new geneencoding a thiamine transporter cause thiamine-responsive megaloblastic anaemiasyndrome. Nat Genet. 1999 Jul;22(3):309-12.
  3. Liberman MC, Tartaglini E, Fleming JC, Neufeld EJ. Deletion of SLC19A2, thehigh affinity thiamine transporter, causes selective inner hair cell loss and an auditory neuropathy phenotype. J Assoc Res Otolaryngol. 2006 Sep;7(3):211-7.
  4. Lorber A, Gazit AZ, Khoury A, Schwartz Y, Mandel H. Cardiac manifestations in thiamine-responsive megaloblastic anemia syndrome. Pediatr Cardiol. 2003Sep-Oct;24(5):476-81. Review.
  5. Oishi K, Diaz GA. Thiamine-Responsive Megaloblastic Anemia Syndrome. 2003 Oct 24 [updated 2017 May 4]. In: Adam MP, Ardinger HH, Pagon RA, Wallace SE, BeanLJH, Stephens K, Amemiya A, editors. GeneReviews® [Internet]. Seattle (WA):University of Washington, Seattle; 1993-2020. Available from
  6. Olsen BS, Hahnemann JM, Schwartz M, Østergaard E. Thiamine-responsivemegaloblastic anaemia: a cause of syndromic diabetes in childhood. PediatrDiabetes. 2007 Aug;8(4):239-41.
  7. Ricketts CJ, Minton JA, Samuel J, Ariyawansa I, Wales JK, Lo IF, Barrett TG.Thiamine-responsive megaloblastic anaemia syndrome: long-term follow-up andmutation analysis of seven families. Acta Paediatr. 2006 Jan;95(1):99-104.
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