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SATB2-associated syndrome

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Description

SATB2-associated syndrome is a condition that affects several body systems. It is characterized by intellectual disability, severe speech problems, dental abnormalities, other abnormalities of the head and face (craniofacial anomalies), and behavioral problems. Some of the common features can be described using the acronym SATB2 (which is the name of the gene involved in the condition): severe speech anomalies, abnormalities of the palate, teeth anomalies, behavioral issues with or without bone or brain anomalies, and onset before age 2.

Individuals with SATB2-associated syndrome typically have mild to severe intellectual disability, and their ability to speak is delayed or absent. Development of motor skills, such as rolling over, sitting, and walking, can also be delayed. Many affected individuals have behavioral problems, including hyperactivity and aggression. Some exhibit autistic behaviors, such as repetitive movements. A happy or overfriendly personality is also common among individuals with SATB2-associated syndrome. Less common neurological problems include feeding difficulties and weak muscle tone (hypotonia) in infancy. About half of affected individuals have abnormalities in the structure of the brain.

The most common craniofacial anomalies in people with SATB2-associated syndrome are a high arch or an opening in the roof of the mouth (high-arched or cleft palate), a small lower jaw (micrognathia), and dental abnormalities, which can include abnormally sized or shaped teeth, extra (supernumerary) teeth, or missing teeth (oligodontia). Some people with SATB2-associated syndrome have other unusual facial features, such as a prominent forehead, low-set ears, or a large area between the nose and mouth (a long philtrum).

Less-commonly affected are the heart, genitals and urinary tract (genitourinary tract), skin, and hair.

Frequency

SATB2-associated syndrome is a rare condition. Its prevalence is unknown.

Causes

SATB2-associated syndrome is caused by genetic changes that affect the SATB2 gene. These include mutations within the SATB2 gene itself and deletions of large pieces of DNA from chromosome 2 that remove the SATB2 gene and other nearby genes. The SATB2 gene provides instructions for making a protein that is involved in the development of the brain and structures in the head and face. The SATB2 protein directs development by controlling the activity of multiple genes in a coordinated fashion.

Researchers suspect that genetic changes affecting the SATB2 gene reduce the amount of functional SATB2 protein. Reduction of SATB2 function likely impairs normal development of the brain and craniofacial structures, leading to intellectual disability, delayed speech, craniofacial anomalies, and other features of SATB2-associated syndrome.

The signs and symptoms of SATB2-associated syndrome are usually similar, regardless of the type of mutation that causes it. However, uncommon features of the condition, such as problems with the heart, genitourinary tract, skin, or hair, tend to occur in individuals with large deletions. Researchers suspect these features are related to the loss of other genes near SATB2.

Inheritance

SATB2-associated syndrome is not typically inherited. It results from new (de novo) mutations in the gene that occur during the formation of reproductive cells (eggs or sperm) or in early embryonic development. Affected individuals have no history of the disorder in their family.

Other Names for This Condition

  • 2q32 deletion syndrome
  • 2q33.1 microdeletion syndrome
  • chromosome 2q32-q33 deletion syndrome
  • Glass syndrome
  • SAS

Additional Information & Resources

Genetic and Rare Diseases Information Center

Catalog of Genes and Diseases from OMIM

Scientific Articles on PubMed

References

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  • Britanova O, Akopov S, Lukyanov S, Gruss P, Tarabykin V. Novel transcription factor Satb2 interacts with matrix attachment region DNA elements in a tissue-specific manner and demonstrates cell-type-dependent expression in the developing mouse CNS. Eur J Neurosci. 2005 Feb;21(3):658-68. Citation on PubMed
  • Britanova O, de Juan Romero C, Cheung A, Kwan KY, Schwark M, Gyorgy A, Vogel T, Akopov S, Mitkovski M, Agoston D, Sestan N, Molnár Z, Tarabykin V. Satb2 is a postmitotic determinant for upper-layer neuron specification in the neocortex. Neuron. 2008 Feb 7;57(3):378-92. doi: 10.1016/j.neuron.2007.12.028. Citation on PubMed
  • Britanova O, Depew MJ, Schwark M, Thomas BL, Miletich I, Sharpe P, Tarabykin V. Satb2 haploinsufficiency phenocopies 2q32-q33 deletions, whereas loss suggests a fundamental role in the coordination of jaw development. Am J Hum Genet. 2006 Oct;79(4):668-78. Epub 2006 Aug 30. Citation on PubMed or Free article on PubMed Central
  • Dobreva G, Chahrour M, Dautzenberg M, Chirivella L, Kanzler B, Fariñas I, Karsenty G, Grosschedl R. SATB2 is a multifunctional determinant of craniofacial patterning and osteoblast differentiation. Cell. 2006 Jun 2;125(5):971-86. Citation on PubMed
  • Zarate YA, Fish JL. SATB2-associated syndrome: Mechanisms, phenotype, and practical recommendations. Am J Med Genet A. 2017 Feb;173(2):327-337. doi: 10.1002/ajmg.a.38022. Epub 2016 Oct 24. Review. Citation on PubMed
  • Zarate YA, Kalsner L, Basinger A, Jones JR, Li C, Szybowska M, Xu ZL, Vergano S, Caffrey AR, Gonzalez CV, Dubbs H, Zackai E, Millan F, Telegrafi A, Baskin B, Person R, Fish JL, Everman DB. Genotype and phenotype in 12 additional individuals with SATB2-associated syndrome. Clin Genet. 2017 Oct;92(4):423-429. doi: 10.1111/cge.12982. Epub 2017 Mar 7. Citation on PubMed
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