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Early detection of Angelman syndrome resulting from de novo paternal isodisomic 15q UPD and review of comparable cases.

Abstract：

BACKGROUND:Angelman syndrome is a rare neurogenetic disorder that results in intellectual and developmental disturbances, seizures, jerky movements and frequent smiling. Angelman syndrome is caused by two genetic disturbances: either genes on the maternally inherited chromosome 15 are deleted or inactivated or two paternal copies of the corresponding genes are inherited (paternal uniparental disomy). A 16-month-old child was referred with minor facial anomalies, neurodevelopmental delay and speech impairment. The clinical symptoms suggested angelman syndrome. The aim of our study was to elucidate the genetic background of this case. RESULTS:This study reports the earliest diagnosed angelman syndrome in a 16-month-old Hungarian child. Cytogenetic results suggested a de novo Robertsonian-like translocation involving both q arms of chromosome 15: 45,XY,der(15;15)(q10;q10). Molecular genetic studies with polymorphic short tandem repeat markers of the fibrillin-1 gene, located in the 15q21.1, revealed that both arms of the translocated chromosome were derived from a single paternal chromosome 15 (isodisomy) and led to the diagnosis of angelman syndrome caused by paternal uniparental disomy. CONCLUSIONS:AS resulting from paternal uniparental disomy caused by de novo balanced translocation t(15q;15q) of a single paternal chromosome has been reported by other groups. This paper reviews 19 previously published comparable cases of the literature. Our paper contributes to the deeper understanding of the phenotype-genotype correlation in angelman syndrome for non-deletion subclasses and suggests that patients with uniparental disomy have milder symptoms and higher BMI than the ones with other underlying genetic abnormalities.

journal_name

Mol Cytogenet

journal_title

Molecular cytogenetics

authors

Horváth E,Horváth Z,Isaszegi D,Gergev G,Nagy N,Szabó J,Sztriha L,Széll M,Endreffy E

doi

10.1186/1755-8166-6-35

subject

Has Abstract

pub_date

2013-09-08 00:00:00

pages

35

issue

1

issn

1755-8166

pii

1755-8166-6-35

journal_volume

6

pub_type

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