| First Author | Heighway J | Year | 1996 |
| Journal | Genomics | Volume | 35 |
| Issue | 1 | Pages | 207-14 |
| PubMed ID | 8661122 | Mgi Jnum | J:33819 |
| Mgi Id | MGI:81312 | Doi | 10.1006/geno.1996.0340 |
| Citation | Heighway J, et al. (1996) Coamplification in tumors of KRAS2, type 2 inositol 1,4,5 triphosphate receptor gene, and a novel human gene, KRAG. Genomics 35(1):207-14 |
| abstractText | Analysis of a region of DNA, coamplified in tumors with KRAS2, resulted in the identification of the human homologue of the mouse KRAG gene. The gene was widely expressed in a range of cell lines, tumors, and normal tissue and demonstrated a high degree of alternate splicing. A human KRAG cDNA sequence, with a structure similar to that encoded by the amplified gene in mouse Y1 adrenal carcinoma cells, was isolated by RT-PCR. The predicted amino acid similarity between the two sequences was 91%, and hydrophobicity plots suggested a structure closely resembling that of transmembrane 4 superfamily members. Identification of a PCR-based restriction fragment length polymorphism confirmed biallelic expression of KRAG but suggested allele-specific splicing differences in tumors. Northern analysis of mRNA derived from a range of tissues suggested high level expression in muscle and confirmed alternate splicing. To facilitate the analysis of exon junctions, a YAC clone encoding the genomic sequence was identified. This allowed the localization of KRAG to human chromosome 12p11.2. Isolation of one end of this nonchimeric clone demonstrated a perfect match with a 247-bp sequence within the 3' untranslated region of the type 2 1,4, 5-inositol triphosphate receptor gene. Multiplex PCR confirmed the inclusion of both genes in the KRAS2 amplicon in human malignancy, suggesting that either may contribute to the malignant phenotype. |
