期刊
NEPHROLOGY DIALYSIS TRANSPLANTATION
卷 37, 期 2, 页码 262-270出版社
OXFORD UNIV PRESS
DOI: 10.1093/ndt/gfab274
关键词
Dent disease-2; Lowe syndrome; OCRL; PI(4; 5)P-2 5-phosphatase
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan [19K17297, 17H04189, 19K08726]
- Grants-in-Aid for Scientific Research [19K17297, 19K08726, 17H04189] Funding Source: KAKEN
This study elucidated the molecular mechanism underlying the different phenotypes in OCRL-related diseases, revealing that the functional OCRL isoform translated starting at exon 8 is associated with this mechanism.
Background Although Lowe syndrome and Dent disease-2 are caused by Oculocerebrorenal syndrome of Lowe (OCRL) mutations, their clinical severities differ substantially and their molecular mechanisms remain unclear. Truncating mutations in OCRL exons 1-7 lead to Dent disease-2, whereas those in exons 8-24 lead to Lowe syndrome. Herein we identified the mechanism underlying the action of novel OCRL protein isoforms. Methods Messenger RNA samples extracted from cultured urine-derived cells from a healthy control and a Dent disease-2 patient were examined to detect the 5 ' end of the OCRL isoform. For protein expression and functional analysis, vectors containing the full-length OCRL transcripts, the isoform transcripts and transcripts with truncating mutations detected in Lowe syndrome and Dent disease-2 patients were transfected into HeLa cells. Results We successfully cloned the novel isoform transcripts from OCRL exons 6-24, including the translation-initiation codons present in exon 8. In vitro protein-expression analysis detected proteins of two different sizes (105 and 80 kDa) translated from full-length OCRL, whereas only one protein (80 kDa) was found from the isoform and Dent disease-2 variants. No protein expression was observed for the Lowe syndrome variants. The isoform enzyme activity was equivalent to that of full-length OCRL; the Dent disease-2 variants retained >50% enzyme activity, whereas the Lowe syndrome variants retained Conclusions We elucidated the molecular mechanism underlying the two different phenotypes in OCRL-related diseases; the functional OCRL isoform translated starting at exon 8 was associated with this mechanism.
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