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Blood, 1 January 2002, Vol. 99, No. 1, pp. 375-377
BRIEF REPORT
Preferential loss of maternal 9p alleles in childhood acute
lymphoblastic leukemia
Ian M. Morison,
Lana M. Ellis,
Lochie R. Teague, and
Anthony E. Reeve
From the Cancer Genetics Laboratory, Department of
Biochemistry, University of Otago, Dunedin, New Zealand; and Paediatric
Haematology/Oncology, Starship Children's Health, Auckland, New
Zealand.
Germ-line events, such as paternal mutation or genomic imprinting,
contribute to the early onset of childhood cancers such as
retinoblastoma, Wilms tumors, and neuroblastoma. Given the high
frequency of deletion involving chromosome 9p in childhood acute
lymphoblastic leukemia (ALL), this study investigated whether 9p
deletion might reflect preexisting germ-line gene inactivation. To do
this the parental origin of deletion was determined in 10 cases of ALL
with 9p21 loss of heterozygosity. Of these cases, 9 showed loss of the
maternally derived allele, suggesting that a germ-line event involving
a 9p gene may play a role in the onset of childhood ALL.

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