DNMT3A overgrowth syndrome
Last updated 3 Aug 2022
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DNMT3A overgrowth syndrome is a disorder characterised by faster than normal growth before and after birth, subtle differences in facial features, and intellectual disability.
Description
DNMT3A overgrowth syndrome is a disorder characterised by faster than normal growth before and after birth, subtle differences in facial features, and intellectual disability.
Individuals with DNMT3A overgrowth syndrome are often longer than normal at birth and are taller than their peers throughout life. Many affected individuals become overweight in late childhood or adolescence. They may also have an abnormally large head size (macrocephaly).
The characteristic facial appearance of individuals with DNMT3A overgrowth syndrome includes a round face; thick, horizontal eyebrows; and narrowed openings of the eyes (narrowed palpebral fissures). Additionally, the upper front teeth are often larger than normal.
Intellectual disability in DNMT3A overgrowth syndrome ranges from mild to severe. Individuals may have features of autism spectrum disorder, which are characterised by impaired communication and socialization skills.
Individuals with DNMT3A overgrowth syndrome may have other signs and symptoms, including a rounded upper back that also curves to the side (kyphoscoliosis), heart defects, flat feet (pes planus), weak muscle tone (hypotonia), or joints that are loose and very flexible (hypermobile joints). Psychological disorders such as depression, anxiety, or obsessive-compulsive disorder can also occur in this disorder.
Inheritance patterns
The source lists the following possible inheritance patterns: Autosomal dominant. More than one pattern can apply in different cases.
Related genes
Other names
Tatton-Brown-Rahman syndrome
TBRS
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Further reading and references
- DNMT3A overgrowth syndrome; MedlinePlus, National Library of Medicine.
- Lemire G, Gauthier J, Soucy JF, Delrue MA. A case of familial transmission of the newly described DNMT3A-Overgrowth Syndrome. Am J Med Genet A. 2017 Jul;173(7):1887-1890. doi: 10.1002/ajmg.a.38119. Epub 2017 Apr 27.
- Okamoto N, Toribe Y, Shimojima K, Yamamoto T. Tatton-Brown-Rahman syndrome due to 2p23 microdeletion. Am J Med Genet A. 2016 May;170A(5):1339-42. doi: 10.1002/ajmg.a.37588. Epub 2016 Feb 11.
- Ostrowski PJ, Tatton-Brown K. Tatton-Brown-Rahman Syndrome. 2022 Jun 30. In: Adam MP, Bick S, Mirzaa GM, Wallace SE, Amemiya A, editors. GeneReviews(R) [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2026. Available from http://www.ncbi.nlm.nih.gov/books/NBK581652/
- Tatton-Brown K, Seal S, Ruark E, Harmer J, Ramsay E, Del Vecchio Duarte S, Zachariou A, Hanks S, O'Brien E, Aksglaede L, Baralle D, Dabir T, Gener B, Goudie D, Homfray T, Kumar A, Pilz DT, Selicorni A, Temple IK, Van Maldergem L, Yachelevich N; Childhood Overgrowth Consortium; van Montfort R, Rahman N. Mutations in the DNA methyltransferase gene DNMT3A cause an overgrowth syndrome with intellectual disability. Nat Genet. 2014 Apr;46(4):385-8. doi: 10.1038/ng.2917. Epub 2014 Mar 9.
- Xin B, Cruz Marino T, Szekely J, Leblanc J, Cechner K, Sency V, Wensel C, Barabas M, Therriault V, Wang H. Novel DNMT3A germline mutations are associated with inherited Tatton-Brown-Rahman syndrome. Clin Genet. 2017 Apr;91(4):623-628. doi: 10.1111/cge.12878. Epub 2017 Jan 22.
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