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Exon

About: Exon is a research topic. Over the lifetime, 38308 publications have been published within this topic receiving 1745408 citations. The topic is also known as: exons.


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Journal ArticleDOI
TL;DR: Complementary DNA clones encoding the human kidney epidermal growth factor (EGF) precursor have been isolated and sequenced and it is shown that it can be synthesized as a membrane protein with its NH2-terminus external to the cell surface.
Abstract: Complementary DNA clones encoding the human kidney epidermal growth factor (EGF) precursor have been isolated and sequenced. They predict the sequence of a 1,207 amino acid protein which contains EGF flanked by polypeptide segments of 970 and 184 residues at its NH2- and COOH-termini, respectively. The structural organization of the human EGF precursor is similar to that previously described for the mouse protein and there is 66% identity between the two sequences. Transfection of COS-7 cells with the human EGF precursor cDNA linked to the SV40 early promoter indicate that it can be synthesized as a membrane protein with its NH2-terminus external to the cell surface. The human EGF precursor gene is approximately 110 kilobase pairs and has 24 exons. Its exon-intron organization revealed that various domains of the EGF precursor are encoded by individual exons. Moreover, 15 of the 24 exons encode protein segments that are homologous to sequences in other proteins. Exon duplication and shuffling appear to have played an important role in determining the present structure of this protein.

331 citations

Journal ArticleDOI
11 Aug 1983-Nature
TL;DR: A common modular structure for ras gene products in which the variable region forms a physiologically important combining site is proposed.
Abstract: The homologue of the viral Kirsten ras (v-Ki-ras) gene found in the human lung carcinoma cell line, Calu-1, has an intron-exon structure similar to that of the human homologue of the viral Harvey ras (v-Ha-ras) gene. A second, potential fourth coding exon is present in the human Ki-ras gene and similar sequences are found in the Kirsten murine sarcoma virus. Cysteine is encoded at the twelfth amino acid position, suggesting that the Calu-1 Ki-ras gene has undergone a mutational activation at the same position as the human Ha-ras gene of the bladder carcinoma cell line, T24. A comparison of their predicted amino acid sequences suggests that ras proteins have a 'constant' region and a 'variable' region. Here we propose a common modular structure for ras gene products in which the variable region forms a physiologically important combining site.

331 citations

Journal ArticleDOI
15 May 1996-Genomics
TL;DR: This work establishes the complete genomic organization of SCN5A and will enable high-resolution analyses of this locus for mutations associated with LQT and other phenotypes for which SCN 5A may be a candidate gene.

331 citations

Journal ArticleDOI
TL;DR: A novel gene is identified, NPHP1, which extends over most of this common deletion at the gene locus NPH1 on 2q13 and encodes a protein with an SH3 domain, which is highly conserved throughout evolution.
Abstract: Juvenile nephronophthisis (NPH), an autosomal recessive cystic kidney disease, is the primary genetic cause of chronic renal failure in children. About two thirds of patients with NPH carry a large homozygous deletion at the gene locus NPH1 on 2q13. We here identify a novel gene, NPHP1, which extends over most of this common deletion. The 4.5–kb transcript encodes a protein with an SH3 domain, which is highly conserved throughout evolution. The 11–kb interval between the 3′ end of NPHP1 and an inverted repeat containing the distal deletion breakpoint was found to contain the first exon of a second gene, MALL. In patients with a hemizygous deletion of the NPH1 region, additional point mutations were found in NPH1 but not in MALL.

331 citations

Journal ArticleDOI
TL;DR: This paper reported mutations in a gene (PRPF31) homologous to Saccharomyces cerevisiae pre-mRNA splicing gene PRP31 in families with autosomal dominant retinitis pigmentosa linked to chromosome 19q13.4 (RP11; MIM 600138).

330 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,618
20222,004
2021905
2020908
2019887
2018909