1/3. spectral karyotyping and fluorescence in situ hybridization analysis of de novo partial trisomy 7p (7p21.2-->pter) and partial monosomy 12q (12q24.33-->qter).An 8-year-old boy presenting with hypotonia, moderate mental retardation, developmental delay, and psychomotor retardation is reported. Magnetic resonance imaging of the brain at age 3 years revealed a Dandy-Walker variant. Cytogenetic analysis of the peripheral blood revealed a derivative chromosome 12 with unknown additional material attached to the distal region of the long arm of chromosome 12. The parental karyotypes were normal. spectral karyotyping (SKY) using the 24-color SKY probes and fluorescence in situ hybridization (FISH) using the specific 7p, 7q, 12p, and 12q telomeric probes confirmed a duplication of distal 7p and a deletion of terminal 12q. The karyotype of the proband was designated as 46,XY.ish der(12)t(7;12) (p21.2;q24. 33)(SKY , 7pTEL , 12qTEL-). The present case provides evidence for the association of partial trisomy 7p (7p21.2-->pter) and partial monosomy 12q (12q24.33-->qter) with a cerebellar malformation and the usefulness of SKY and FISH in the identification of a de novo aberrant chromosome resulting from an unbalanced translocation.- - - - - - - - - - ranking = 1keywords = hybridization (Clic here for more details about this article) |
2/3. Dandy-Walker malformation in a fetus with pentasomy X (49,XXXXX) prenatally diagnosed by fluorescence in situ hybridization technique.We present the case of a pentasomy X (49,XXXXX) prenatally diagnosed. The fluorescent in situ hybridization technique assisted in making the diagnosis. The problems identified in this fetus include a Dandy-Walker malformation, hydrocephaly, ventricular septal defect, hypertelorism and polyhydramnios.- - - - - - - - - - ranking = 1keywords = hybridization (Clic here for more details about this article) |
3/3. Application of fluorescent in situ hybridization for 'de novo' anomalies in prenatal diagnosis.Fluorescent in situ hybridization (FISH) was carried out for three cases of abnormal karyotypes in prenatal studies. Two concerned de novo structural anomalies and the third a marker chromosome. The origin of the extra material could be defined in all three cases, which gives a better insight into the relationship between genotype and phenotype and makes more adequate genetic counselling possible.- - - - - - - - - - ranking = 0.8keywords = hybridization (Clic here for more details about this article) |