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Digging deeper into the intronic sequences of the SPINK1 gene [Letter]

Zou, Wen-Bin, Masson, Emmanuelle, Boulling, Arnaud, Cooper, David Neil, Li, Zhao-Shen, Liao, Zhuan, Férec, Claude and Chen, Jian-Min 2016. Digging deeper into the intronic sequences of the SPINK1 gene [Letter]. Gut 65 (6) , pp. 1055-1056. 10.1136/gutjnl-2016-311428

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We read with great interest the recent paper by Beer and Sahin-Tóth1 addressing the ‘missing heritability’ observed in approximately 60% of German cases of chronic pancreatitis.2 These authors opined that ‘discovery studies tend to focus on exons and exon–intron boundaries and may thus miss many intronic variants’.1 This premise seems eminently reasonable, given the generally much larger size of intronic sequences as compared with the coding sequences of protein-coding genes. However, there is a trade-off here. On the one hand, larger sequence size means larger target size for mutation, and hence the greater the number of mutations that could be missed if intronic sequences were not screened. On the other hand, to be of pathological significance, an intronic mutation must either create a new functional splicing donor or acceptor site or alternatively impact a functional sequence motif responsible for regulating splicing (eg, an intronic splicing enhancer), which depends upon many additional factors other than just sequence length. As yet, it is unclear what the ratio of pathological intronic:exonic variants will turn out to be, although intronic mutations are …

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Medicine
Subjects: Q Science > QH Natural history > QH426 Genetics
Publisher: BMJ Publishing Group Ltd
ISSN: 0017-5749
Date of First Compliant Deposit: 28 February 2018
Date of Acceptance: 21 January 2016
Last Modified: 26 Apr 2018 05:50

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