Partial 18q12 trisomy, due to intrachromosomal duplication, was found in a severely mentally retarded boy. The finding of nonspecific dysmorphism in this patient demonstrates that trisomy of band 18q12 is accompanied by neither a full nor an incomplete 18 trisomy phenotype, indicating that this phen
Partial trisomy 18q in a newborn with typical 18 trisomy phenotype
โ Scribed by J. P. Fryns; F. Detavernier; A. Fleteren; H. Berghe
- Publisher
- Springer
- Year
- 1978
- Tongue
- English
- Weight
- 238 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0340-6717
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โฆ Synopsis
This paper describes a case of partial trisomy of almost the entire long arm of chromosome 18 in a newborn with classic trisomy-18 phenotype, resulting from a de novo unbalanced 181/21p translocation: karyotype: 46,XX,-21,t(18;21)(18qter leads to 18q11 ::21p12 leads to 21qter). A review of the other reported cases of partial trisomy 18 suggests that a critical segment in chromosome 18, corresponding to bands q11-q12, might be responsible for most of the signs of trisomy 18, including failure to thrive and early death.
๐ SIMILAR VOLUMES
## Abstract We report the 6th case of double trisomy X and 18, ie, 48,XXX,+18. The infant lacked overlapping fingers, simian creases, and structural heart disease and is alive at 275 days. Two X chromosomes were late replicating. Anomalies of the hands and kidneys involved only the right side in th