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Molecular and Cellular Biology, January 2000, p. 372-378, Vol. 20, No. 1
0270-7306/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
INK4d-Deficient Mice Are Fertile Despite
Testicular Atrophy
Frederique
Zindy,1
Jan
van Deursen,2
Gerard
Grosveld,2
Charles J.
Sherr,1,3 and
Martine F.
Roussel1,*
Departments of Tumor Cell
Biology1 and
Genetics2 and Howard Hughes
Medical Institute,3 St. Jude Children's
Research Hospital, Memphis, Tennessee 38105
Received 26 August 1999/Returned for modification 21 September
1999/Accepted 22 September 1999
The INK4 family of cyclin-dependent kinase (CDK) inhibitors
includes four 15- to 19-kDa polypeptides (p16INK4a,
p15INK4b, p18INK4c, and p19INK4d)
that bind to CDK4 and CDK6. By disrupting cyclin D-dependent holoenzymes, INK4 proteins prevent phosphorylation of the
retinoblastoma protein and block entry into the DNA-synthetic phase of
the cell division cycle. The founding family member,
p16INK4a, is a potent tumor suppressor in humans, whereas
involvement, if any, of other INK4 proteins in tumor surveillance is
less well documented. INK4c and INK4d are
expressed during mouse embryogenesis in stereotypic tissue-specific
patterns and are also detected, together with INK4b, in
tissues of young mice. INK4a is expressed neither before
birth nor at readily appreciable levels in young animals, but its
increased expression later in life suggests that it plays some
checkpoint function in response to cell stress, genotoxic damage, or
aging per se. We used targeted gene disruption to generate mice lacking
INK4d. These animals developed into adulthood, had a normal
life span, and did not spontaneously develop tumors. Tumors did not
arise at increased frequency in animals neonatally exposed to ionizing
radiation or the carcinogen dimethylbenzanthrene. Mouse embryo
fibroblasts, bone marrow-derived macrophages, and lymphoid T and B
cells isolated from these animals proliferated normally and displayed
typical lineage-specific differentiation markers. Males exhibited
marked testicular atrophy associated with increased apoptosis of germ
cells, although they remained fertile. The absence of tumors in
INK4d-deficient animals demonstrates that, unlike
INK4a, INK4d is not a tumor suppressor but is
instead involved in spermatogenesis.
*
Corresponding author. Mailing address: Department of
Tumor Cell Biology, St. Jude Children's Research Hospital, 332 North Lauderdale, Memphis, TN 38105. Phone: (901) 495-3481. Fax: (901) 495-2381. E-mail: martine.roussel{at}stjude.org.
Molecular and Cellular Biology, January 2000, p. 372-378, Vol. 20, No. 1
0270-7306/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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