Search for a rare disease
Other search option(s)
17q23.1q23.2 microdeletion syndrome
Disease definition
17q23.1q23.2 microdeletion syndrome is a recently described syndrome characterized by developmental delay, microcephaly, short stature, heart defects and limb abnormalities.
ORPHA:261279
Classification level: DisorderSummary
Epidemiology
It has been clinically and molecularly characterized in 7 patients.
Clinical description
All individuals had mild to moderate developmental delay, in particular speech delay. All except one had heart defects, including mainly patent ductus arteriosus or atrial septal defect. Limb abnormalities include long, thin fingers and toes, and hypoplasia of patellae. Scoliosis is also present. Patients had some mild and unspecific dysmorphic facial features.
Etiology
The syndrome is caused by an interstitial deletion encompassing 17q23.1q23.2. The deletions were characterized by comparative genomic hybridization (CGH) microarray and fluorescence in situ hybridization (FISH). The underlying mechanism is non-allelic homologous recombination (NAHR). Parental FISH testing in five of the seven cases confirmed a de novo origin. The minimal deletion region of 2.2 Mb encompasses 2 transcription factors, TBX2 and TBX4, which are good candidate genes for explaining the phenotype.
A summary on this disease is available in Deutsch (2011) Español (2011) Français (2011) Italiano (2011) Nederlands (2011) Português (2011) Greek (2011, pdf) Polski (2011, pdf)
Additional information