Identification of a splicing enhancer in MLH1 using COMPARE, a new assay for determination of relative RNA splicing efficiencies.

Identification of a splicing enhancer in MLH1 using COMPARE, a new assay for determination of relative RNA splicing efficiencies.
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使用 COMPARE 鉴定 MLH1 中的剪接增强子,COMPARE 是一种确定相对 RNA 剪接效率的新测定方法。

DOI:
10.1093/hmg/ddi450
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发表时间:
2006
影响因子:
3.5
通讯作者:
Mattox,William
Mattox,William
中科院分区:
生物学2区
文献类型:
--
作者:
Xu,Dong-Qing;Mattox,William

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Exonic splicing enhancers (ESEs) are sequences that facilitate recognition of splice sites and prevent exon-skipping. Because ESEs are often embedded within protein-coding sequences, alterations in them can also often be interpreted as nonsense, missense or silent mutations. To correctly interpret exonic mutations and their roles in diseases, it is important to develop strategies that identify ESE mutations. Potential ESEs can be found computationally in many exons but it has proven difficult to predict whether a given mutation will have effects on splicing based on sequence alone. Here, we describe a flexiblein vitromethod that can be used to functionally compare the effects of multiple sequence variants on ESE activity in a singlein vitrosplicing reaction. We have applied this method in parallel with conventional splicing assays to test for a splicing enhancer in exon 17 of the humanMLH1gene. Point mutations associated with hereditary non-polyposis colorectal cancer (HNPCC) have previously been found to correlate with exon-skipping in both lymphocytes and tumors from patients. We show that sequences from this exon can replace an ESE from the mouse IgM gene to support RNA splicing in HeLa nuclear extracts. ESE activity was reduced by HNPCC point mutations in codon 659, indicating that their primary effect is on splicing. Surprisingly, the strongest enhancer function mapped to a different region of the exon upstream of this codon. Together, our results indicate that HNPCC point mutations in codon 659 affect an auxillary element that augments the enhancer function to ensure exon inclusion.
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