Natural disruption of the mouse mast cell protease 7 gene in the C57BL/6 mouse - PubMed (original) (raw)
. 1996 Feb 2;271(5):2851-5.
doi: 10.1074/jbc.271.5.2851.
Affiliations
- PMID: 8576265
- DOI: 10.1074/jbc.271.5.2851
Free article
Natural disruption of the mouse mast cell protease 7 gene in the C57BL/6 mouse
J E Hunt et al. J Biol Chem. 1996.
Free article
Abstract
The C57BL/6 mouse differs from the BALB/c mouse in that its ear and skin mast cells and its progenitor bone marrow-derived mast cells (mBMMCs) do not express mouse mast cell protease (mMCP) 7. We now report that, as detected by nuclear run-on analysis, the mMCP-7 gene is transcribed in C57BL/6 mBMMCs at a rate comparable to that in BALB/c mBMMCs. Reverse transcriptase-polymerase chain reaction analysis and sequencing of the product revealed that the ears of C57BL/6 mice contain small amounts of a mMCP-7 transcript that possesses a 98-base pair deletion. The deletion begins at a normally quiescent cryptic splice site (G416TGAG), 98 base pairs upstream of the normal exon 2/intron 2 splice site (G514TGAG), and introduces a premature stop codon in the alternatively spliced transcript. Thus, even if translated, the mature protein would consist of only 18 amino acids as compared to 245 amino acids in normal mMCP-7. Sequence analysis of the mMCP-7 gene in the C57BL/6 mouse revealed that the cryptic splice site is activated due to a G514-->A point mutation at the first nucleotide of the normal exon 2/intron 2 splice site. This is the first report of a mutation of a gene that encodes a mast cell secretory granule constituent that leads to its loss of expression. Moreover, the mMCP-7 gene is the first found in any species that sequentially has undergone a splice site mutation to cause retention of an intron and then a second splice site mutation to cause activation of a cryptic splice site.
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