Chromosome 15q overgrowth syndrome: prenatal diagnosis, molecular cytogenetic characterization, and perinatal findings in a fetus with dup(15)(q26.2q26.3).
OBJECTIVE
To present molecular cytogenetic characterization of a prenatally detected duplication of 15q26.2→q26.3 in a fetus with overgrowth.


METHODS
A 34-year-old para 0 woman underwent amniocentesis at 18 weeks of gestation because of advanced maternal age. Amniocentesis revealed a derivative chromosome 15, or der(15), with additional material at the end of the long arm of one chromosome 15. Parental karyotypes were normal. Fetal overgrowth was first noted at 21 weeks of gestation. Repeated amniocentesis was performed at 22 weeks of gestation. Array comparative genomic hybridization revealed a 4.71-Mb duplication from 15q26.2 to 15q26.3 encompassing the IGF1R gene. Fluorescence in situ hybridization analysis using the bacterial artificial chromosome clone probes specific for 15q26.2-q26.3 and the subtelomeric region of 15q showed a direct duplication and no terminal deletion in the der(15). Polymorphic DNA marker analysis determined a paternal origin of the duplication of 15q. Level II ultrasound at 23 weeks of gestation revealed a fetal biometry equivalent to 26 weeks. The pregnancy was subsequently terminated, and a 1062-g (>99(th) centile) malformed fetus was delivered at 24 weeks of gestation with craniofacial dysmorphism, craniosynostosis, and overgrowth.


CONCLUSIONS
The present case provides evidence for prenatal overgrowth, craniosynostosis, and characteristic facial dysmorphism in association with a duplication of 15q26.2→q26.3 and a duplication of the IGF1R gene. Prenatal diagnosis of fetal overgrowth should include a differential diagnosis of the chromosome 15q overgrowth syndrome.
Department of Obstetrics and Gynecology, Mackay Memorial Hospital, Taipei, Taiwan. cpc_mmh@yahoo.com
Chih-Ping
CP
Chen
Yi-Hui
YH
Lin
Heng-Kien
HK
Au
Yi-Ning
YN
Su
Chin-Yuan
CY
Hsu
Yu-Peng
YP
Liu
Pei-Chen
PC
Wu
Schu-Rern
SR
Chern
Yu-Ting
YT
Chen
Li-Feng
LF
Chen
Adam Hwa-Ming
AH
Hsieh
Wayseen
W
Wang
D000328:Adult; D000649:Amniocentesis; D058674:Chromosome Duplication / Q000235:genetics*; D002884:Chromosomes, Human, Pair 15 / Q000235:genetics*; D003398:Craniosynostoses / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000235:genetics*; D003937:Diagnosis, Differential; D019066:Facies; D005260:Female; D047109:Fetal Development / Q000235:genetics; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D011859:Radiography