Amplification of the E2F1 transcription factor gene in the HEL erythroleukemia cell line.

Abstract:

:The E2F transcription factor plays an important regulatory role in cell proliferation, mediating the expression of genes whose products are essential for inducing resting cells to enter the cell cycle and synthesize DNA. To investigate the possible involvement of E2F in hematopoietic malignancies, we isolated genomic clones encompassing the human E2F1 gene. We then used fluorescence in situ hybridization to localize E2F1 to human chromosome 20q11, telomeric to the p107 locus, a gene whose product is related to the retinoblastoma gene product (pRb). This finding contrasts with the 1p36 and 6q22 chromosomal locations previously assigned E2F2 and E2F3, two additional members of the E2F family. Although deletions or structural rearrangements of E2F1 were not detected in 14 primary acute leukemia or myelodysplasia samples with structural abnormalities of chromosome 20q11, the gene was amplified and overexpressed in HEL erythroleukemia cells and translocated to other chromosomes in several established human leukemia cell lines. This study provides the first evidence of gene amplification involving a member of the E2F family of transcription factors. We propose that E2F1 overexpression in erythroid progenitors may stimulate abnormal cell proliferation by overriding negative regulatory signals mediated by tumor suppressor proteins such as pRb.

journal_name

Genomics

journal_title

Genomics

authors

Saito M,Helin K,Valentine MB,Griffith BB,Willman CL,Harlow E,Look AT

doi

10.1016/0888-7543(95)80118-6

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

130-8

issue

1

eissn

0888-7543

issn

1089-8646

pii

0888-7543(95)80118-6

journal_volume

25

pub_type

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