Toshiyuki Yamamoto    Department   School of Medicine(Tokyo Women's Medical University Hospital), School of Medicine    Position   Professor
Article types	Case report
Language	English
Peer review	Non peer reviewed
Title	Jacobsen Syndrome due to an unbalanced translocation between 11q23 and 22q11.2 identified at age 40 years.
Journal	Formal name：American Journal of Medical Genetics PartA
Volume, Issue, Page	158A(1),pp.220-223
Author and coauthor	Ikuko Takahashi, Tsutomu Takahashi, Kenichi Sawada, Keiko Shimojima, Toshiyuki Yamamoto
Publication date	2012/01
Summary	A woman with psychomotor developmental delay, congenital glaucoma, and distinctive facial features, and a short neck was diagnosed with Jacobsen syndrome (JBS) at age 40 years. A previously reported balanced translocation between chromosome 11 and 22 instead showed an unbalanced translocation by a microarray-based comparative hybridization analysis with the final karyotype of 46,XX,der(11)t(11;22)(q23.3;q11.21),del(22)(q11.21) dn. The breakpoint of chromosome 11 was determined to be at TECTA and not near the apolipoprotein gene cluster site or the fragile site (FRA11B), which are commonly seen in patients with t(11;22) and patients with typical 11q deletions, respectively. Although the phenotypic features of the patient, including psychomotor developmental delay, distinctive features, and mild thrombocytopenia, were consistent with JBS, congenital glaucoma, which is an uncommon finding of JBS, was the most prominent condition during her natural history.
DOI	10.1002