Biomaterial Database

A case of presumptive monosomy 21 re-diagnosed as unbalanced t(5p;21q) by FISH and review of literature. 1997

M A Iqbal, and M Z Ahmed, and D Wu, and N Sakati

Department of Pathology and Laboratory Medicine, Riyadh, Saudi Arabia.

By using fluorescence in situ hybridization (FISH), we demonstrate a case of monosomy 21 to result from an unbalanced translocation involving the short arm of chromosome 5 and the long arm of chromosome 21. Our case is compared to 3 similar cases of t(5p;21q) reported recently, which were also originally diagnosed as monosomy 21. The breakpoint on chromosome 5 in these cases occurred in the p13-p15 region, whereas the breakpoint on chromosome 21 was in the q21-q22 region. Comparison of the clinical findings in these patients demonstrated great similarities. Furthermore, a strong correlation between the clinical manifestations of these patients with cridu-chat syndrome patients was also noted. We suggest that cases with unbalanced t(5p;21q) represent a distinct syndrome which can be grouped under a new category of "5p/21q deletion syndrome."

UI	MeSH Term	Description	Entries
D007231	Infant, Newborn	An infant during the first 28 days after birth.	Neonate,Newborns,Infants, Newborn,Neonates,Newborn,Newborn Infant,Newborn Infants
D007621	Karyotyping	Mapping of the KARYOTYPE of a cell.	Karyotype Analysis Methods,Analysis Method, Karyotype,Analysis Methods, Karyotype,Karyotype Analysis Method,Karyotypings,Method, Karyotype Analysis,Methods, Karyotype Analysis
D008297	Male		Males
D009006	Monosomy	The condition in which one chromosome of a pair is missing. In a normally diploid cell it is represented symbolically as 2N-1.	Monosomies
D002891	Chromosomes, Human, Pair 21	A specific pair of GROUP G CHROMOSOMES of the human chromosome classification.	Chromosome 21
D002895	Chromosomes, Human, Pair 5	One of the two pairs of human chromosomes in the group B class (CHROMOSOMES, HUMAN, 4-5).	Chromosome 5
D003410	Cri-du-Chat Syndrome	An infantile syndrome characterized by a cat-like cry, failure to thrive, microcephaly, MENTAL RETARDATION, spastic quadriparesis, micro- and retrognathia, glossoptosis, bilateral epicanthus, hypertelorism, and tiny external genitalia. It is caused by a deletion of the short arm of chromosome 5 (5p-).	5p Deletion Syndrome,Chromosome 5p- Syndrome,5p Minus Syndrome,5p- Syndrome,Cat Cry Syndrome,Chromosome 5 Short Arm Deletion Syndrome,Chromosome 5p Deletion Syndrome,Crying Cat Syndrome,Deletion of Short Arm of Chromosome 5 Syndrome,5p Deletion Syndromes,5p Minus Syndromes,5p Syndrome,5p- Syndrome, Chromosome,5p- Syndromes,5p- Syndromes, Chromosome,Cat Cry Syndromes,Chromosome 5p- Syndromes,Cri du Chat Syndrome,Cri-du-Chat Syndromes,Crying Cat Syndromes,Deletion Syndrome, 5p,Deletion Syndromes, 5p,Minus Syndrome, 5p,Minus Syndromes, 5p,Syndrome, 5p Deletion,Syndrome, 5p Minus,Syndrome, 5p-,Syndrome, Cat Cry,Syndrome, Chromosome 5p-,Syndrome, Cri-du-Chat,Syndrome, Crying Cat,Syndromes, 5p Deletion,Syndromes, 5p Minus,Syndromes, Cat Cry,Syndromes, Chromosome 5p-,Syndromes, Cri-du-Chat,Syndromes, Crying Cat
D003937	Diagnosis, Differential	Determination of which one of two or more diseases or conditions a patient is suffering from by systematically comparing and contrasting results of diagnostic measures.	Diagnoses, Differential,Differential Diagnoses,Differential Diagnosis
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D014178	Translocation, Genetic	A type of chromosome aberration characterized by CHROMOSOME BREAKAGE and transfer of the broken-off portion to another location, often to a different chromosome.	Chromosomal Translocation,Translocation, Chromosomal,Chromosomal Translocations,Genetic Translocation,Genetic Translocations,Translocations, Chromosomal,Translocations, Genetic