A four-year-old boy with ring chromosome 17 presenting with early-onset, pharmacoresistant epilepsy underwent repeated 24-hour video-EEG monitoring and cytogenetic analyses, including fluorescent in situ hybridization with telomeric and locus-specific probes of chromosome 17. Epilepsy was characterized by nocturnal motor seizures and by prolonged diurnal electrical status epilepticus. The 46, X...

A four-year-old boy with ring chromosome 17 presenting with early-onset, pharmacoresistant epilepsy underwent repeated 24-hour videoEEG monitoring and cytogenetic analyses, including fluorescent in situ hybridization with telomeric and locus-specific probes of chromosome 17. Epilepsy was characterized by nocturnal motor seizures and by prolonged diurnal electrical status epilepticus. The 46, XY...

Results of a molecular-genetic study on the mechanism of uniparental disomy (UPD) in three individuals are reported. Case 1 was a physically normal adult whose Rh blood-type showed mosaicism of two phenotypes, D+ (or D/D genotype) and D-(or d/d genotype), while his father and mother were a D/d heterozygote and a D/D homozygote respectively. Allele-typing of his peripheral blood leukocytes and b...

Kiossoglou, K. A., Mitus, W. J., and Dameshek, W. (1965). Chromosomal aberrations in acute leukemia. Blood. The Journal of Hematology, 26, 610-641. Loiodice, G., Rovetta, D. G., Bellicini, G., Callura, G., and Bergamo, F. (1970). Malformazioni multiple congenite in un bambino portatore diuna anomalia cromosomica del gruppo F(46/XY,20 p), figlio di un soggetto, clinicamente sano, affetto da anal...

A 6 month old patient is reported with a ring chromosome 18 confirmed by cytogenetic studies and in situ hybridisation. Her clinical features were similar to previous cases of ring chromosome 18 syndrome. The ring chromosome was inherited from the phenotypically and mentally normal mother with a mos 46,XX/47,XX, + r(18) karyotype.

We present a male patient with constitutional ring 1 chromosome and subsequent 6 Mb deletion at 1q43q44. The patient displays overlapping clinical features with reported patients with ring 1 chromosome and 1q43q44 microdeletion syndrome. To our knowledge, this is the first patient with ring 1 chromosome characterized by comparative genomic hybridization.

Objective: a fetus with a ring chromosome 20 is presented. Methods: at 16 weeks’ gestation, ultrasound examination evidenced no apparent structural malformation. Amniocentesis was performed for maternal anxiety. Results: chromosome analysis identified a ring chromosome 20 and array-CGH demonstrated that the ring including micro-deletion of the short arm in 20p13, that was extended for about 632...

We have integrated a plasmid containing a yeast centromere, CEN5, into the HIS4 region of chromosome III by transformation. Of the three transformant colonies examined, none contained a dicentric chromosome, but all contained a rearranged chromosome III. In one transformant, rearrangement occurred by homologous recombination between two Ty elements; one on the left arm and the other on the righ...

We present a case with a small extra ring chromosome which was found in 66% of lymphocytes on routine cytogenetic examination. FISH analyses, using centromere specific and single copy probes, showed that the extra ring chromosome was derived from the most proximal part of 10p, close to the centromere. The patient has a unilateral cleft lip and palate, mild dysmorphic features, and mild mental r...

A fetus with de novo ring chromosome 16 is presented. At 20 weeks' gestation, ultrasound examination demonstrated bilateral clubfoot, bilateral renal pyelectasis, hypoplasia of the corpus callosum, and transposition of the great vessel. Amniocentesis was performed. Chromosome analysis identified a ring chromosome 16 [47,XY,r(16)] and array comparative genomic hybridization (a-CGH) demonstrated ...