Prenatal diagnosis of a large de novo terminal deletion of chromosome 11q.
OBJECTIVE
To describe the prenatal phenotype of the 11q deletion syndrome (Jacobsen syndrome) and present the molecular characterization of the deletion in the case presented.


METHODS
Ultrasound at 18 and 20 weeks of gestation, on a 34-year-old woman who presented for amniocentesis, revealed slow movements, oligohydramnios and dilatation of the cerebral ventricles in the fetus. Maternal and paternal ages were 34 and 38 years, respectively.


RESULTS
Prenatal karyotyping of cultured amniotic fluid cells revealed an 11q terminal deletion, 46,XX,del(11)(q23) (Jacobsen syndrome). Real-time quantitative PCR analysis was used to identify and map the breakpoint physically to a 45-kb region located 14.5 Mb from the 11q telomere. Polymorphic DNA marker analysis showed that DNA sequences on the paternally derived chromosome are deleted. At autopsy, facial dysmorphism without major malformations was recorded. Examination of the internal organs disclosed the following abnormalities: a Meckels' diverticulum of 4-mm length, adhesion between the gall bladder and the transverse colon, and bilaterally bilobed lungs without further situs anomalies.


CONCLUSIONS
Our case demonstrates significant phenotypic variability of Jacobsen syndrome at midtrimester pregnancy; the syndrome may be manifested at this stage only by mild to moderate ventriculomegaly of the brain.
Boehm
D
D
Institute of Human Genetics, University of Goettingen, Goettingen, Germany.
Laccone
F
F
Burfeind
P
P
Herold
S
S
Schubert
C
C
Zoll
B
B
Männer
J
J
Pauer
H U
HU
Bartels
I
I
D000015:Abnormalities, Multiple / Q000000981:diagnostic imaging / Q000235:genetics*; D000328:Adult; D002872:Chromosome Deletion; D002880:Chromosomes, Human, Pair 11 / Q000235:genetics*; D019465:Craniofacial Abnormalities / Q000000981:diagnostic imaging / Q000235:genetics*; D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging / Q000235:genetics*; D006801:Humans; D010641:Phenotype; D011247:Pregnancy; D016216:Ultrasonography, Prenatal