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Molecular and Cellular Biology, May 2001, p. 3598-3603, Vol. 21, No. 10
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.10.3598-3603.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Disruption of Ini1 Leads to Peri-Implantation
Lethality and Tumorigenesis in Mice
Cynthia J.
Guidi,1
Arthur T.
Sands,2
Brian P.
Zambrowicz,2
Tod K.
Turner,1
Delia A.
Demers,1
William
Webster,3
Thomas W.
Smith,4
Anthony N.
Imbalzano,1 and
Stephen N.
Jones1,*
Departments of Cell
Biology,1 Animal
Medicine,3 and
Pathology,4 University of Massachusetts
Medical School, Worcester, Massachusetts 01655, and Lexicon
Genetics, The Woodlands, Texas 773812
Received 20 December 2000/Accepted 14 February 2001
 |
ABSTRACT |
SNF5/INI1 is a component of the ATP-dependent chromatin
remodeling enzyme family SWI/SNF. Germ line mutations of
INI1 have been identified in children with brain and renal
rhabdoid tumors, indicating that INI1 is a tumor suppressor. Here we
report that disruption of Ini1 expression in mice results
in early embryonic lethality. Ini1-null embryos die between
3.5 and 5.5 days postcoitum, and Ini1-null blastocysts fail
to hatch, form the trophectoderm, or expand the inner cell mass when
cultured in vitro. Furthermore, we report that approximately 15% of
Ini1-heterozygous mice present with tumors, mostly
undifferentiated or poorly differentiated sarcomas. Tumor formation is
associated with a loss of heterozygocity at the Ini1 locus,
characterizing Ini1 as a tumor suppressor in mice. Thus, Ini1 is
essential for embryo viability and for repression of
oncogenesis in the adult organism.
 |
INTRODUCTION |
The compact nature of chromatin
structure presents a barrier to cellular processes that require access
to DNA. A number of multiprotein complexes have been identified that
share the ability to modify chromatin structure. These include the
histone acetyltransferases and deacetylases, complexes which
chemically modify the amino-terminal tails of histones by the
addition or removal of acetyl groups, respectively, as well as a group
of enzymes that utilize the energy derived from ATP hydrolysis to
alter nucleosome structure (16, 20, 43, 44, 50). Included
among these ATP-dependent chromatin remodeling enzymes is the
SWI/SNF family of chromatin modifiers.
SWI/SNF enzymes are large multisubunit enzymes of ~1 to 2 MDa. Yeast
SWI/SNF genes were originally identified as being required for mating
type switching or sucrose fermentation (4, 32, 42). Later
work determined that SWI/SNF genes were required for the induction of a
subset of yeast genes and that the SWI2/SNF2 protein possessed a
DNA-stimulated ATPase activity (6, 22, 26, 33, 34,
54). Mutations in SWI/SNF genes could be suppressed by mutations
altering histone gene expression, histone structure, or
nonhistone chromatin proteins, leading to the suggestion that these
gene products facilitated transcriptional activation by altering
chromatin structure (15, 23, 24).
Human SWI/SNF (hSWI/SNF) complexes contain either the human BRM (hBRM)
(hSNF2
) or BRG1 (hSNF2
) homologues of the yeast SWI2/SNF2 ATPase (7, 19, 30). Both yeast and human SWI/SNF
complexes have been shown to possess nucleosome remodeling activity in
vitro (8, 17, 25). Components of mammalian SWI/SNF
complexes have been implicated in a variety of cellular processes,
including gene activation and repression, development and
differentiation, recombination and repair, and cell cycle control.
There is evidence supporting a role for SWI/SNF in gene activation
events mediated by nuclear hormone receptors, environmental stress, and
viral infection (1, 7, 10, 13, 30). In contrast, SWI/SNF components also were shown to be involved in repression of
c-fos and some E2F-regulated genes (31, 48).
Both BRG1 and hBRM can interact with the retinoblastoma oncoprotein and
induce cell cycle arrest, an effect that is abrogated by the
association of BRG1 with cyclin E (11, 41, 45, 56).
Evidence suggesting a role for hSWI/SNF in recombination and repair was
provided by studies demonstrating an interaction of components of the
hSWI/SNF complex with BRCA1, which is thought to be involved in DNA
damage and repair pathways (3). Furthermore, members of
the SWI/SNF complex are targets of viral regulatory proteins upon
infection of cells by adenovirus, Epstein-Barr virus, human
immunodeficiency virus, and human papillomavirus (18, 27, 28,
53).
The role of SWI/SNF enzymes in whole organisms is unclear. While
homozygous disruption of Brg1 in mouse embryonic carcinoma cells
resulted in lethality, disruption of Brm expression in mice produced
only mild proliferative effects (35, 46). The upregulation of Brg1 in the Brm-deficient mice may provide a compensatory effect; however, one cannot rule out the possibility that these differences are
due to distinct functions of Brm- or Brg1-containing complexes.
SNF5/INI1 is a member of both BRG1- and BRM-containing SWI/SNF
complexes (29, 51). INI1 was shown to interact with ALL-1, translocations of which are associated with several types of human acute leukemias (37). Furthermore, INI1 has
been found to be altered in malignant rhabdoid tumors, choroid plexus
carcinomas, medullablastomas, and central primitive neuroectodermal
tumors (2, 9, 39, 40, 49). Identification of
constitutional mutations in a subset of these tumors indicates that
INI1 is a tumor suppressor (2, 40). In an attempt to
generate a mouse model that would allow further characterization of the
mechanisms of Ini1 in tumorigenesis and to determine the
role of the mammalian SWI/SNF complexes in development, we generated
mice deficient for Ini1 expression. We show that
Ini1-deficient mice die early in embryogenesis, likely due
to an inability of the blastocysts to hatch, implant in the uterus, and
continue development. In addition, we report that a subset of the
Ini1-heterozygous mice present with a variety of tumors in
the soft tissues of the head and neck and that loss of heterozygosity
at the Ini1 locus is correlated with tumor formation.
 |
MATERIALS AND METHODS |
Ini1 targeting.
Embryonic stem (ES) cells
(Omnibank no. OST32815) bearing a retroviral promoter trap that
functionally inactivates one allele of Ini1 were generated
as described previously (55). Analysis by rapid
amplification of cDNA ends also is described. The site of insertion
was determined using sequence analysis.
Creation of Ini1-null mice.
Ini1-targeted ES cells were injected into 3.5 days
postcoitum (d.p.c.) C57BL/6 blastocysts. Male chimeric mice were mated with wild-type C57BL/6 or 129 females. Germ line transmission of the
mutant allele was determined by PCR analysis of tail genomic DNA using
the following primers: for Ini1,
5'-GCAAGCGCTCTGCCAATTGACC-3' and
3'-CACACCCTATTGTCACTCTGGAA-5';
geo,
5'-CGGTATCGATAAGCTTGATGATC-3' and
3'-GTCAACGCGTCGGACTTACCGC-5'. Ini1-heterozygous mice were intercrossed to generate Ini1-null mice. Embryos 6.5 d.p.c. and younger were prepared for genotyping by PCR as described
previously (47). Nested PCR was done using the above
primers for the first round of PCR (29 cycles) and the following intron
3-nested primers for the second round (29 cycles):
5'-GCGTGCGCCACCATGCCTGG-3' and 3'-CTTCTGGAGACTTCACTTACGTCC-5'.
Blastocyst culture.
Blastocysts from heterozygous
intercrosses were flushed from the uteri of
Ini1in3/+ females 3.5 d.p.c. with M15 media
(Dulbecco's minimal essential medium, 15% fetal calf serum, 100 µM
-mercaptoethanol, 2 mM glutamine, and 1× penicillin-streptomycin)
and cultured in tissue culture plates for 96 h. Embryo cultures
were genotyped as described above.
-Galactosidase staining of cultured ES cells.
Wild-type
AB2.2 ES cells and Ini1in3/+ ES cells were grown
to near-confluency and fixed in 0.5% glutaraldehyde. Cells were then rinsed with phosphate-buffered saline and stained overnight in the dark
at room temperature in a solution containing 5 mM potassium ferricyanide, 5 mM potassium ferrocyanide, 2 mM MgCl2, and
1 mg of 5-bromo-4-chloro-3-indolyl-
-D-galactopyranoside
(X-Gal)/ml.
Whole mount staining of embryos for
-galactosidase
activity.
Embryos were harvested at various time points
postfertilization and fixed in 4% paraformaldehyde for 20 min at
4°C. Embryos were washed and then stained in an X-Gal
histochemical reaction mixture (4 mM potassium ferrocyanide, 4 mM
potassium ferricyanide, 2 mM MgCl2, 1 mg of X-Gal/ml)
overnight at room temperature. Following staining, embryos were
rinsed in phosphate-buffered saline and cleared in 30% sucrose.
Western analysis of tumor samples.
Control tissues and tumor
samples were homogenized in lysis buffer containing 50 mM Tris-HCl (pH
7.5), 150 mM NaCl, 0.5% NP-40, 20% glycerol, 1 mM dithiothreitol, 1 µg of pepstatin A/ml, 4 µg of leupeptin/ml, and 1 mM
phenylmethylsulfonyl fluoride. Extracts were resolved by sodium dodecyl
sulfate-polyacrylamide gel electrophoresis, and Western analysis for
Ini1 protein was performed as described previously (10).
Histologic analysis of tumors in mice.
Tumor samples and
selected tissues were fixed in 10% buffered formalin phosphate and
processed for paraffin embedding as described previously
(14). Sections were prepared, stained with hematoxylin and
eosin, and examined under a microscope.
 |
RESULTS AND DISCUSSION |
Mouse ES cells bearing a retroviral promoter trap that
functionally inactivates one allele of Ini1 were constructed
as described previously (55). Sequence analysis revealed
that the promoter trap was inserted within intron 3 of Ini1
(Fig. 1A). The
beta-galactosidase-neomycin (
-geo) gene fusion cassette within the
retroviral insertion has a 5' splice acceptor site; thus,
-geo
expression is regulated by the native Ini1 promoter. We were
able to utilize the
-geo gene cassette in a colorimetric assay to
determine if Ini1 is normally expressed in ES cells.
Ini1-targeted cells stained positive for
-galactosidase
activity, indicating that Ini1 is expressed in ES cells
(Fig. 2A). Northern analysis of ES cell
total RNA confirmed Ini1 expression (data not shown).
Furthermore, sequence data obtained from 5' rapid amplification of
cDNA ends analysis of the Ini1-
-galactosidase fusion
mRNA revealed that transcripts utilizing either splice donor site in
exon 2 spliced into the trap, indicating that both splice variants of
Ini1 were inactivated (5).

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FIG. 1.
Disruption of Ini1. (A) Targeting strategy
for Ini1. A retroviral promoter trap vector was inserted in
intron 3 of Ini1. sa and sd, the splice acceptor site in the
-geo gene cassette and the splice donator site in the puromycin
selection marker, respectively. Carets represent the site of alternate
splicing. Positions of the primers used for PCR analysis are shown. LTR
(del), long terminal repeat deleted; An, polyadenylation
signal; Puro, puromycin. (B) Genotyping of Ini1-targeted
mice by PCR. Genomic DNA was harvested from tails and genotyped as
described in Materials and Methods. The size and position of wild-type
(WT) and targeted bands are indicated. (C) Genotyping of
Ini1-targeted embryos. Embryos 6.5 d.p.c. and younger
were genotyped by nested PCR. The size and position of wild-type and
targeted bands are indicated.
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FIG. 2.
Ini1 is expressed in ES cells and
ubiquitously throughout development. (A) -galactosidase staining of
targeted ES cells showing expression of Ini1. Wild-type (WT)
AB2.2 ES cells were used as a control. (B) Whole mount staining of
Ini1in3/+ embryos showing ubiquitous expression
of Ini1 at indicated time points. Wild-type embryos at 6.5 and 10.5 d.p.c. are shown as controls.
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|
To determine the role of Ini1 in mammalian development and
tumorigenesis, we used the targeted ES cells in blastocyst injection experiments to generate Ini1-heterozygous
(Ini1in3/+) mice. In order to monitor
expression of Ini1 during embryogenesis, we performed whole
mount staining for
-galactosidase activity in embryos harvested from
Ini1in3/+ matings at various times
during development. We found that
Ini1in3/+ embryos stained positive in
all tissues at all time points examined, including 6.5, 8.5, 9.5, and
10.5 d.p.c., indicating that Ini1 is ubiquitously
expressed during embryogenesis (Fig. 2B). Ini1 expression
was also detected by Northern analysis in a wide range of adult tissues
(35) (data not shown).
Chimeric mice generated from C57BL/6 strain blastocyst injections of
the 129 strain-derived ES cells were bred to wild-type C57BL/6 or 129 mice in order to obtain Ini1in3/+ mice on either
a mixed (C57BL/6 × 129) or pure (129) background. Intercrosses of Ini1in3/+ mice in
both backgrounds yielded Ini1in3/+
offspring and wild-type offspring at a 2:1 ratio (63:26 in the mixed
background, 34:17 in the pure background) and no Ini1-null offspring, indicating that disruption of Ini1 induces
embryonic lethality (Fig. 1B). Timed matings of
Ini1in3/+ mice were performed, and embryos were
harvested at various time points in gestation for genotyping via PCR.
Ini1-null embryos could be isolated at 3.5 d.p.c. and
were normal in appearance (Fig. 1C and 3). However, no
Ini1in3/in3 embryos were detected at 6.5 d.p.c. or later (Table 1). Dissection of
maternal deciduae at 6.0 to 6.5 d.p.c. revealed no significant increase in the number of embryo reabsorptions, suggesting that Ini1in3/in3 lethality occurred between days 3.5 and 5.5 of gestation. These results indicate that Ini1-null
embryos either failed to be implanted into the uterine wall or were
implanted and were reabsorbed shortly thereafter. In order to examine
further the developmental defect of Ini1in3/in3
embryos, we analyzed the ability of blastocysts from
Ini1in3/+ intercrosses to expand in vitro. When
3.5-d.p.c. blastocysts were plated in culture, wild-type and
Ini1in3/+ blastocysts hatched from the zona
pellucida and were implanted onto the tissue culture plastic. Both
wild-type and Ini1in3/+-implanted embryos formed
the trophectoderm and expanded their inner cell mass (ICM). In
contrast, no Ini1in3/in3 blastocysts hatched and
were implanted in culture (Fig. 3). The results of these experiments suggest that the peri-implantation embryonic lethality of Ini1-null mice may be due to a defect
in the hatching of the blastocyst from the zona pellucida, an
obligate step for implantation of the embryo into the wall of the
uterus during normal development. Manual disruption of the zona
pellucida of 19 (C57BL/6 × 129) blastocysts harvested from
Ini1in3/+ intercrosses did not result in
expansion of the Ini1-null trophectoderm or ICM
during in vitro culture, suggesting that growth of these tissues also is compromised (data not shown). Expression of
Ini1 in ES cells, which are derived from the ICM of
3.5 d.p.c. blastocysts, is consistent with a gene crucial to the
peri-implantation or preimplantation stage of embryogenesis.

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FIG. 3.
Ini1-null mice are early embryonic lethal and
fail to hatch in vitro. Blastocysts were harvested from C57BL/6
Ini1in3/+ females and plated in culture for
96 h, at which time outgrowths were processed for PCR. Blastocysts
are shown before and after culturing. TE, trophectoderm; ICM, inner
cell mass.
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In humans, loss of INI1 is correlated with a variety of
tumors, the vast majority of which are neuronal or renal in
nature. To date, most human malignant rhabdoid tumors and choroid
plexus carcinomas examined have deletions and/or mutations in
INI1, as do a subset of central primitive neuroectodermal
tumors and medullablastomas (39). In mice, we found that
approximately 15% of Ini1 heterozygotes in both the mixed
F1 (C57BL/6 × 129) or pure 129 backgrounds presented with tumors.
All of these tumors arose in the head or neck regions of the mice,
particularly in the soft tissue of the face (Table 2). While 2 of the 15 mouse tumors
analyzed thus far had varying degrees of rhabdoid-like cells, none had
the characteristic, monomorphous appearance of human rhabdoid tumors.
Two Ini1in3/+ mice were found to have a
lymphoproliferative disorder or lymphoma originating in an ill-defined
region on the neck (Fig. 4). Two-thirds of the tumors originated on the faces of the mice. Interestingly, expression of Ini1 appears to be elevated during development
in the branchial arch and in the frontonasal and maxillary processes (Fig. 2B), structures which contribute to formation of the face. While
the majority of the facial tumors were poorly differentiated or
undifferentiated sarcomas and not neuronal in origin, it is possible
that the tumors arose in cells derived from neural crest progenitors,
since neural crest cells, along with mesodermal cells, coordinate to
form the facial primordia (12, 38).

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FIG. 4.
Ini1-heterozygous mice present with various
tumors. Microscopic features of different tumors from
Ini1in3/+ mice. Parafin-embedded tumors were
sectioned, stained with hematoxylin and eosin, and examined under a
microscope at magnification ×75. Mouse numbers corresponding to those
presented in Table 2 are indicated in each panel.
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We have analyzed tumors in three representative mice.
Northern analysis of total RNA harvested from tumor tissue
indicated the presence of wild-type-length Ini1 message
(data not shown). However, Western blot analysis of proteins harvested
from these tumors revealed the absence of Ini1 protein in all three
samples (Fig. 5). This indicates that
loss of heterozygosity at the Ini1 locus is responsible for
tumor formation in the Ini1in3/+ mice.

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FIG. 5.
Loss of heterozygosity at the Ini1 locus
results in tumor formation. Tumor samples and control tissue (wild-type
[WT] male brain) were processed for Western analysis as detailed in
Materials and Methods. The band corresponding to the Ini1 protein is
indicated. NS represents a nonspecific band.
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The mechanism of Ini1-mediated tumor suppression is unclear.
Other subunits of the human and mouse SWI/SNF chromatin remodeling complexes have been reported to associate with known tumor suppressors, including Rb and Brca1 (3, 11, 48, 56), and several of the
SWI/SNF subunits appear to be molecular targets of viral regulators of
cell proliferation (18, 27, 28, 53). In addition, one of
these subunits, BRG1, recently has been reported to be missing or
mutated in a variety of human tumor cell lines, and reintroduction of
BRG1 into these tumor cells reverses their transformed morphology (52). These findings suggest a role for chromatin
remodeling in regulation of cell growth and/or in tumor suppression.
While this report was in preparation, Roberts et al. and
Klochendler-Yeivin et al. published data consistent with our findings (21, 36). The fact that these results are reproducible in knockout lines generated by different targeting strategies confirms the
importance of Ini1 in development and tumorigenesis. Klochendler-Yeivin et al. (21) further report in their study that
Ini1-deficient embryos can induce the formation of maternal decidua,
suggesting that Ini1-deficient embryos undergo hatching and
implantation prior to their demise. In contrast,
Ini1in3/in3 embryos fail to hatch from the zona
pellucida, suggesting that subtle strain variations may influence the
precise timing of embryonic lethality. In agreement with these other
groups, a percentage of the Ini1-heterozygous mice in our
colony presented with tumors that contained variable numbers of
rhabdoid cells. However, we are hesitant to classify these
undifferentiated sarcomas as true rhabdoid tumors, which are described
as monomorphous tumors in the human population. Discrepancies between
tumor types associated with disruption of Ini1 in humans and
in mice may be due to differences in species-specific differentiation
pathways. Regardless, the Ini1-heterozygous mice should
provide a useful model for studying the general mechanisms involved in
tumor suppression by Ini1.
 |
ACKNOWLEDGMENTS |
We thank J. Castillo and D. Hill for help in preparing the
manuscript. We also thank A. Fraire and R. Hesselton for assistance with histopathology.
This work was supported in part by grants from the NIH to A.N.I. and
S.N.J. A.N.I. is supported by a Scholar Award from the Leukemia
and Lymphoma Society.
 |
FOOTNOTES |
*
Corresponding author. Mailing address: Department of
Cell Biology, University of Massachusetts Medical School, 55 Lake Ave. North, Worcester, MA 01655. Phone: (508) 856-7500. Fax: (508) 856-7510. E-mail: stephen.jones{at}umassmed.edu.
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Molecular and Cellular Biology, May 2001, p. 3598-3603, Vol. 21, No. 10
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.10.3598-3603.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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Zhang, Z.-K., Davies, K. P., Allen, J., Zhu, L., Pestell, R. G., Zagzag, D., Kalpana, G. V.
(2002). Cell Cycle Arrest and Repression of Cyclin D1 Transcription by INI1/hSNF5. Mol. Cell. Biol.
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Sarnowski, T. J., Swiezewski, S., Pawlikowska, K., Kaczanowski, S., Jerzmanowski, A.
(2002). AtSWI3B, an Arabidopsis homolog of SWI3, a core subunit of yeast Swi/Snf chromatin remodeling complex, interacts with FCA, a regulator of flowering time. Nucleic Acids Res
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Strobeck, M. W., Reisman, D. N., Gunawardena, R. W., Betz, B. L., Angus, S. P., Knudsen, K. E., Kowalik, T. F., Weissman, B. E., Knudsen, E. S.
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Kim, J. K., Huh, S.-O., Choi, H., Lee, K.-S., Shin, D., Lee, C., Nam, J.-S., Kim, H., Chung, H., Lee, H. W., Park, S. D., Seong, R. H.
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