Intermittent 20q- and consistent i(7q) in a patient with Shwachman-Diamond syndrome.
Shwachman Diamond syndrome (SDS) is a genetic disorder characterized by pancreatic hypoplasia, recurrent infection and bone marrow dysfunction. Some cases have an abnormality of chromosome 7, such as isochromosome 7q (i(7q)), which may be associated with the development of leukemia. We present a boy who was diagnosed with SDS at 19 months of age. From age 5-14 years, bone marrow cytogenetics has shown a consistent abnormality - i(7q), with an intermittent separate abnormality - deletion 20q, from age 11 years. During this time, the boy has been clinically well without leukemic signs, managed conservatively. We suggest that deletion 20q may be a non random secondary change in SDS with i(7q).
Smith
Arabella
A
Department of Cytogenetics, Children's Hospital at Westmead, Sydney, Australia. ellies@chw.edu.aus
Shaw
Peter J
PJ
Webster
Boyd
B
Lammi
Ahti
A
Gaskin
Kevin
K
Diaz
Sara
S
Sharma
Praveen
P
D001855:Bone Marrow Diseases / Q000175:diagnosis / Q000235:genetics*; D002872:Chromosome Deletion; D002890:Chromosomes, Human, Pair 20; D002897:Chromosomes, Human, Pair 7; D020732:Cytogenetic Analysis; D010188:Exocrine Pancreatic Insufficiency / Q000175:diagnosis / Q000235:genetics; D006801:Humans; D007223:Infant; D018404:Isochromosomes; D008297:Male; D013577:Syndrome