Lamellar ichthyosis with pseudoexon activation in the transglutaminase 1 gene.

Abstract

We report a case of a 12-year-old boy who was born as a collodion baby after which thick scales developed on his entire body surface. His younger brother showed a similar skin condition. Arcuate-shaped, large, brownish scales covered his face with ectropion. His lower legs were also covered with larger thick, brownish, plate-like scales, but other areas were covered with smaller scales. Next-generation sequencing for exons and splice sites detected a stop-gain TGM1 mutation leading to p.R71* in transglutaminase 1 (TG1). Another mutation identified was a cryptic mutation in intron 3 that activated a pseudoexon, which was detected by RNA-based analysis of hair bulbs. The deep intronic mutation caused another truncation mutation, p.N171Tfs(*) 45, in TG1. An in situ TG1 assay demonstrated that TG1 activity was totally lost in this case. Thus, we conclude that the severe phenotype of the patient developed due to those novel compound heterozygous null truncation mutations in TGM1.

• Authors: Yasushi Suga, Tatsuya Tsuda, Makoto Nagai, Yoshiko Sakaguchi, Orie Jitsukawa, Masaaki Yamamoto, Kiyotaka Hitomi, Kiyofumi Yamanishi
• Journal: The Journal of dermatology (J Dermatol) Vol. 42 Issue 6 Pg. 642-5 (Jun 2015) ISSN: 1346-8138 [Electronic] England
• PMID: 25808943 (Publication Type: Case Reports, Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2015 Japanese Dermatological Association.

Chemical References

• Transglutaminases
• transglutaminase 1

Topics

• Child
• Humans
• Ichthyosis, Lamellar (genetics)
• Introns
• Male
• Mutation
• Transglutaminases (genetics)