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- W49662148 abstract "Meningiomas are tumors of the central nervous system in which loss of heterozygosity for markers on the long arm of chromosome 22 is a frequent event. We have previously described a balanced t(4;22)(p16;q11), which was observed in meningioma 32. We have cloned a gene (MN1), which is disrupted by the translocation breakpoint. The gene spans about 70 kb on chromosome 22q11. A total of 7.5 kb of overlapping cDNA clones were isolated. A comparison of the cDNA clones with the genomic cosmid contig from this region shows that the MN1 gene consists of at least two large exons of approximately 4.7 kb and 2.8 kb. Sequence analysis of the MN1 cDNA revealed two open reading frames (ORFs) of 1 and 2.3 kb which are separated by a region of approximately 1 kb with stop codons in all reading frames. The second ORF is disrupted by the t(4;22) translocation. In the region between the ORFs 2 CAG repeats have been found. These repeats do not display length variation in meningiomas. There is no obvious homology in the nucleotide and putative amino acid sequences with other known genes. The MN1 gene is highly conserved in evolution. The approximately 8 kb MN1 mRNAmore » is ubiquitously expressed with an alternative 4.5 kb transcript in skeletal muscle. In meningiomas the expression pattern is very variable and a 6.5 kb transcript is sometimes also observed. Some, including meningioma 32, show no expression suggesting that the gene could function as a tumor suppressor gene for meningeal cells. Paradoxically, however, a very high expression is sometimes also observed in meningiomas.« less" @default.
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- W49662148 date "1994-09-01" @default.
- W49662148 modified "2023-09-23" @default.
- W49662148 title "Characterization of a gene which is disrupted by a balanced translocation in a meningioma" @default.
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