PMID- 10361988 OWN - NLM STAT- MEDLINE DCOM- 19990716 LR - 20190816 IS - 0009-9163 (Print) IS - 0009-9163 (Linking) VI - 55 IP - 4 DP - 1999 Apr TI - An unbalanced half-cryptic translocation involving the 6q subtelomeric region and 2p25.3 in a child with mental retardation: uses and limitations of fluorescence in situ hybridization. PG - 265-8 AB - We report on a 5-year-old boy with minor anomalies, growth retardation, and developmental delay carrying an extra chromatin material on the terminal band of the long arm of chromosome 6. To determine the origin of this extra material, whole chromosome fluorescence in situ hybridization (FISH) was used initially. Results showed fully painted 6qs, excluding the possibility of a derivative. However, maternal cytogenetic investigation suggested the presence of a possible half-cryptic balanced translocation that was further assessed using specific subtelomeric FISH probes of chromosome 6. Results showed that the 6q subtelomeric region was translocated on an A-group chromosome that was ultimately characterized, using FISH, as chromosome 2. This illustrates the use of specific subtelomeric regions and the limitations of whole chromosome FISH to identify the origin of a subtle chromosomal abnormality. FAU - Batanian, J R AU - Batanian JR AD - Department of Pediatrics, Health Sciences Center, St. Louis University School of Medicine, MO 63104, USA. batanijr@slu.edu FAU - Hussain, M I AU - Hussain MI LA - eng PT - Case Reports PT - Journal Article PL - Denmark TA - Clin Genet JT - Clinical genetics JID - 0253664 RN - 0 (DNA Probes) SB - IM MH - *Chromosomes, Human, Pair 2 MH - *Chromosomes, Human, Pair 6 MH - DNA Probes MH - Developmental Disabilities/genetics MH - Humans MH - In Situ Hybridization, Fluorescence MH - Infant MH - Intellectual Disability/*genetics MH - Male MH - *Translocation, Genetic EDAT- 1999/06/11 00:00 MHDA- 1999/06/11 00:01 CRDT- 1999/06/11 00:00 PHST- 1999/06/11 00:00 [pubmed] PHST- 1999/06/11 00:01 [medline] PHST- 1999/06/11 00:00 [entrez] AID - 10.1034/j.1399-0004.1999.550409.x [doi] PST - ppublish SO - Clin Genet. 1999 Apr;55(4):265-8. doi: 10.1034/j.1399-0004.1999.550409.x.