Kagami-Ogata syndrome

Definition:

Paternal uniparental disomy 14 syndrome is characterized by characteristic face, a small bell-shaped thorax with coat-hanger appearance of the ribs, abdominal wall defects, placentomegaly and polyhydramnios. Human chromosome 14q32.2 carries a cluster of imprinted genes including paternally expressed genes (PEGs) such as DLK1 and RTL1 and maternally expressed genes (MEGs) such as MEG3, RTL1as (RTL1 antisense) and MEG8, together with the intergenic differentially methylated region (IG-DMR) and the MEG3-DMR. It has been reported that epimutations (hypermethylations) and microdeletions affecting the IG-DMR and/or the MEG3-DMR, result in paternal uniparental disomy 14 like phenotype. Recently, the name 'Kagami-Ogata syndrome' has been approved for this clinically recognizable disorder.

References:

[1]. Giovanni Corsello, et al. Paternal uniparental disomy chromosome 14-like syndrome due a maternal de novo 160 kb deletion at the 14q32.2 region not encompassing the IG- and the MEG3-DMRs: Patient report and genotype-phenotype correlation. Am J Med Genet A. 2015 Dec;167A(12):3130-8. [Content Brief]

[2]. Masayo Kagami, et al. Deletions and epimutations affecting the human 14q32.2 imprinted region in individuals with paternal and maternal upd(14)-like phenotypes. Nat Genet. 2008 Feb;40(2):237-42. [Content Brief]

[3]. Tsutomu Ogata, et al. Kagami-Ogata syndrome: a clinically recognizable upd(14)pat and related disorder affecting the chromosome 14q32.2 imprinted region. J Hum Genet. 2016 Feb;61(2):87-94. [Content Brief]

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