Detection of paternal uniparental disomy 9 in a neonate with prenatally detected mosaicism for a small supernumerary marker chromosome 9 and a supernumerary ring chromosome 9.
OBJECTIVE
We present the association of paternal uniparental disomy (UPD) 9 with mosaicism for a small supernumerary marker chromosome 9 [sSMC(9)] and a supernumerary ring chromosome 9 [r(9)].


MATERIALS AND METHODS
A 38-year-old woman underwent amniocentesis at 17 weeks of gestation because of advanced maternal age. Amniocentesis revealed a karyotype of 47,XY,+mar [25]/48,XY,+mar,+r(9) [4]/47,XY,+r(9) [1]/46,XY [6]. The parental karyotypes were normal. Array comparative genomic hybridization (aCGH) of cultured amniocytes revealed a result of de novo 9p13.1q21.11 (38,792,472-71,026,063) × 2.64. The marker chromosome was determined to be an sSMC(9) by spectral karyotyping and aCGH. A phenotypically normal baby was delivered at 38 weeks of gestation. During pediatric follow-ups at age two years, the neonate manifested normal psychomotor and growth development. Cytogenetic analysis, metaphase fluorescence in situ hybridization (FISH), single nucleotide polymorphism (SNP) aCGH and polymorphic DNA marker analysis were performed on the peripheral blood of the neonate.


RESULTS
The neonate's blood had the following results. Metaphase FISH confirmed coexistence of the sSMC(9) and the supernumerary r(9). The karyotype was 47,XY,+sSMC(9) [14]/48,XY, +sSMC(9),+r(9) [10]/47,XY,+r(9) [6]/46,XY [10]. SNP aCGH revealed arr 9p22.3q21.11 (14,234,165-71,035,608) × 2-3, arr 9p24.3p22.3 (216,123-14,629,321)hmz, arr 9p21.3p13.2 (24,769,722-36,732,597)hmz and arr 9q21.11q34.3 (71,013,799-141,011,581)hmz. Polymorphic DNA marker analysis showed paternal isodisomy 9.


CONCLUSION
Individuals with mosaicism for sSMC(9) and supernumerary r(9) may be associated with paternal UPD 9.
['Chen|Chih-Ping|CP|', 'Chen|Ming|M|', 'Wang|Liang-Kai|LK|', 'Chern|Schu-Rern|SR|', 'Wu|Peih-Shan|PS|', 'Chen|Shin-Wen|SW|', 'Lai|Shih-Ting|ST|', 'Chang|Shun-Ping|SP|', 'Yang|Chien-Wen|CW|', 'Pan|Chen-Wen|CW|', 'Wang|Wayseen|W|']
D000328:Adult D000649:Amniocentesis D002899:Chromosomes, Human, Pair 9 D055028:Comparative Genomic Hybridization D005260:Female D005819:Genetic Markers D006801:Humans D017404:In Situ Hybridization, Fluorescence D007231:Infant, Newborn D059785:Karyotype D007621:Karyotyping D008297:Male D009030:Mosaicism D000072740:Paternal Inheritance D010641:Phenotype D011247:Pregnancy D012303:Ring Chromosomes D024182:Uniparental Disomy
Paternal uniparental disomy 9 Small supernumerary marker chromosome 9 Supernumerary ring chromosome 9 9p duplication syndrome