Baraitser-Winter Syndrome 2

Clinical Characteristics

Ocular Features:

Hypertelorism, high arched eyebrows, ptosis, and colobomas occur in the majority of individuals.

Systemic Features:

Short stature, postnatal microcephaly, lissencephaly, intellectual disability, seizures, and sensorineural hearing loss are common.

Genetics

This syndrome can be considered to be an autosomal dominant disorder secondary to heterozygous mutations in the ACTG1 [1] gene (17q25.3). However, all patients have been sporadic.

Mutations in ACTG1 [1] are also responsible for autosomal dominant progressive nonsyndromic hearing loss.

A similar but unique condition known as Baraitser-Winter syndrome 1 [2] (243310 [3]) is caused by heterozygous mutations in the ACTB [4] gene.

Treatment

Treatment Options:

There is no known treatment but special education, hearing devices, and physical therapy may be helpful.

References

Article Title:

Baraitser-Winter cerebrofrontofacial syndrome: delineation of the spectrum in 42 cases [5]

Verloes A, Di Donato N, Masliah-Planchon J, Jongmans M, Abdul-Raman OA, Albrecht B, Allanson J, Brunner H, Bertola D, Chassaing N, David A, Devriendt K, Eftekhari P, Drouin-Garraud V, Faravelli F, Faivre L, Giuliano F, Guion Almeida L, Juncos J, Kempers M, Eker HK, Lacombe D, Lin A, Mancini G, Melis D, Lourenco CM, Siu VM, Morin G, Nezarati M, Nowaczyk MJ, Ramer JC, Osimani S, Philip N, Pierpont ME, Procaccio V, Roseli ZS, Rossi M, Rusu C, Sznajer Y, Templin L, Uliana V, Klaus M, Van Bon B, Van Ravenswaaij C, Wainer B, Fry AE, Rump A, Hoischen A, Drunat S, Riviere JB, Dobyns WB, Pilz DT. Baraitser-Winter cerebrofrontofacial syndrome: delineation of the spectrum in 42 cases. Eur J Hum Genet. 2014 Jul 23.

PubMed ID:

25052316

De novo mutations in the actin genes ACTB and ACTG1 cause Baraitser-Winter syndrome [6]

Riviere JB, van Bon BW, Hoischen A, Kholmanskikh SS, O'Roak BJ, Gilissen C, Gijsen S, Sullivan CT, Christian SL, Abdul-Rahman OA, Atkin JF, Chassaing N, Drouin-Garraud V, Fry AE, Fryns JP, Gripp KW, Kempers M, Kleefstra T, Mancini GM, Nowaczyk MJ, van Ravenswaaij-Arts CM, Roscioli T, Marble M, Rosenfeld JA, Siu VM, de Vries BB, Shendure J, Verloes A, Veltman JA, Brunner HG, Ross ME, Pilz DT, Dobyns WB. De novo mutations in the actin genes ACTB and ACTG1 cause Baraitser-Winter syndrome. Nat Genet. 2012 Feb 26;44(4):440-4.

PubMed ID:

22366783

Iris coloboma, ptosis, hypertelorism, and mental retardation: a new syndrome [7]

Baraitser M, Winter RM. Iris coloboma, ptosis, hypertelorism, and mental retardation: a new syndrome. J Med Genet. 1988 Jan;25(1):41-3.

PubMed ID:

3551890