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Heterozygous Loss-Of-Function Variants in CYP1B1 Predispose to Primary Open-Angle Glaucoma

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Heterozygous Loss-Of-Function Variants in CYP1B1 Predispose to Primary Open-Angle Glaucoma See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/26706621 Heterozygous Loss-of-Function Variants in CYP1B1 Predispose to Primary Open-Angle Glaucoma Article in Investigative ophthalmology & visual science · August 2009 DOI: 10.1167/iovs.09-3880 · Source: PubMed CITATIONS READS 48 511 9 authors, including: Francesca Pasutto Gabriela Chavarria Friedrich-Alexander-University of Erlangen-Nürnberg University of Costa Rica 64 PUBLICATIONS 1,746 CITATIONS 20 PUBLICATIONS 298 CITATIONS SEE PROFILE SEE PROFILE Christian Mardin Magnus Ingelman-Sundberg Friedrich-Alexander-University of Erlangen-Nürnberg Karolinska Institutet 193 PUBLICATIONS 3,183 CITATIONS 600 PUBLICATIONS 33,507 CITATIONS SEE PROFILE SEE PROFILE Some of the authors of this publication are also working on these related projects: Pharmacoepigenetics View project Erlanger Glaukom-Register View project All content following this page was uploaded by Gabriela Chavarria on 02 June 2014. The user has requested enhancement of the downloaded file. Glaucoma Heterozygous Loss-of-Function Variants in CYP1B1 Predispose to Primary Open-Angle Glaucoma Francesca Pasutto,1 Gabriela Chavarria-Soley,1 Christian Y. Mardin,2 Karin Michels-Rautenstrauss,1 Magnus Ingelman-Sundberg,3 Lorena Ferna´ndez-Martínez,1 Bernhard H. F. Weber,4 Bernd Rautenstrauss,1,5 and Andre´ Reis1 PURPOSE. Although primary congenital glaucoma (PCG)–associ- CONCLUSIONS. Heterozygous CYP1B1 mutations with absent or ated CYP1B1 mutations in the heterozygous state have been reduced relative enzymatic activity can be considered a risk evaluated for association with primary open-angle glaucoma factor for POAG. (Invest Ophthalmol Vis Sci. 2010;51: (POAG) in several small studies, their contribution to the oc- 249–254) DOI:10.1167/iovs.09-3880 currence of POAG is still controversial. The present study was conducted to determine whether heterozygous functionally characterized CYP1B1 mutations are associated with the dis- laucoma represents a heterogeneous group of complex ease in a large cohort of German patients with POAG. Gneurodegenerative diseases and is the second leading cause of blindness worldwide.1,2 The most common form of METHODS. The frequency of CYP1B1 variants on direct se- glaucoma is primary open-angle glaucoma (POAG; OMIM quencing of the entire coding region was compared in 399 137760) which affects more than 35 million people world- unrelated German patients with POAG (270, POAG; 47, JOAG; wide.3,4 POAG is characterized by loss of retinal ganglion cells, and 82, NTG) and 376 control subjects without any signs of specific atrophy of the optic nerve, progressive loss of the glaucoma on ophthalmic examination. In vitro functional as- neuroretinal rim of the optic disc, with corresponding progres- says were performed and relative enzymatic activity of the sive visual field loss, and, if untreated, eventual blindness.2 CYP1B1 variants embedded in their respective background Elevated IOP appears to be a major risk factor, although glau- haplotypes and not previously unambiguously classified were coma develops in some patients even in the absence of ele- 5 determined, to assess their possible causative role. vated IOP. In this case, glaucoma is defined as normal-tension glaucoma (NTG). Based on age at onset, a juvenile form (JOAG, RESULTS. Apart from known polymorphic variants, 11 amino age at onset before 40 years) is differentiated from adult-onset acid substitutions in CYP1B1 reported before, both in PCG and POAG.6 A family history of the disease has long been recog- POAG cases, were identified. After in vitro functional assay, nized as a risk factor, suggesting that specific genetic variants variants P52L and R368H showed marked reduction of activity, contribute to pathogenesis of POAG. In some families, glau- confirming their role as loss-of-function mutations similar to coma segregates as a Mendelian trait with reduced penetrance previously determined variants G61E, N203S, and G329V. In and variable expressivity, but most cases are sporadic, suggest- contrast, variants G168D, A443G, and A465V showed no rele- ing a multifactorial contribution to its etiology.7 vant effects and were thus classified as polymorphisms. Over- To date, 14 genetic loci for POAG have been identified all, seven functionally impaired variants were present in 13 through linkage studies (GLC1A–GLC1N). However, only three (3.6%) patients and in 1 (0.2%) control subject (P ϭ 0.002, causative genes have been described: myocilin (MYOC/ OR ϭ 5.4). Reanalysis of previous studies reporting CYP1B1 GLC1A), optineurin (OPTN/GLC1E), and WD repeat domain 36 mutations in patients with POAG based on updated functional (WDR36/GLC1G). Altogether, mutations in these genes ac- validation showed a significant excess of carriers among pa- count for less than 10% of POAG cases.8 In addition, associa- tients compared to controls (OR ϭ 3.85; P ϭ 2.3 ϫ 10Ϫ7). tion studies have implicated more than 20 other genes.9 Al- though most of these have been reported in single studies, a few have been investigated in multiple-association studies, but findings have been inconsistent. One of these POAG-associated From the 1Institute of Human Genetics and the 2Department of genes is cytochrome P450 1B1 (CYP1B1: MIM 601771 (Men- Ophthalmology; Friedrich-Alexander-University Erlangen-Nuremberg, 3 delian Inheritance in Man; National Center for Biotechnology Erlangen, Germany; the Section of Pharmacogenetics, Department of Information, Bethesda, MD). Cytochrome P450 proteins are Physiology and Pharmacology, Karolinska Institutet, Stockholm, Swe- 4 monooxygenases, which catalyze many reactions involved in den; and the Institute of Human Genetics, University Regensburg, 10 Regensburg, Germany. the metabolism of drugs as well as steroids and other lipids. 5Present affiliation: MGZ-Medical Genetics Centre, Munich, Ger- Mutations in CYP1B1 are the predominant cause of primary many. congenital glaucoma (PCG), which although generally rare, is Supported by Grants SFB 539 and in part by Grant WE1259/14-3 the most common form of glaucoma in infants, with more than from the German Research Foundation (DFG). 80% of cases observed within the first year of life.11 This Submitted for publication April 20, 2009; revised June 22, 2009; disorder is most likely due to developmental defects in the accepted July 17, 2009. trabecular meshwork and the anterior chamber angle. In PCG, Disclosure: F. Pasutto, None; G. Chavarria-Soley, None; C.Y. elevated IOP can rapidly lead to axonal loss and permanent loss Mardin, None; K. Michels-Rautenstrauss, None; M. Ingelman- of vision in untreated individuals. Inheritance is primarily au- Sundberg, None; L. Ferna´ndez-Martínez, None; B.H.F. Weber, 12 None; B. Rautenstrauss, None; A. Reis, None tosomal recessive with variable penetrance. Although the Corresponding author: Andre´ Reis, Institute of Human Genetics, role of CYP1B1 in congenital glaucoma is not well understood, Friedrich-Alexander-University Erlangen-Nuremberg, Schwabachanlage the enzyme is probably responsible for the metabolism of 10, 91054 Erlangen, Germany; [email protected]. compounds that are critical for the developing eye.10 Investigative Ophthalmology & Visual Science, January 2010, Vol. 51, No. 1 Copyright © Association for Research in Vision and Ophthalmology 249 250 Pasutto et al. IOVS, January 2010, Vol. 51, No. 1 Initially, CYP1B1 was suggested to be a modifier gene for exclude an intracerebral expansion or malperfusion. Stenosis of the the expression of MYOC in patients with JOAG.13 However, aorta carotis interna was excluded by means of sonography. Patients some studies have indicated that CYP1B1 may play a causative were classified as having JOAG when age at onset in the index case was role in JOAG, with possible monogenic association in below 40 years and no other ocular reason for open-angle glaucoma French,14 Indian,15 and Spanish16 patients. Furthermore, het- was identifiable. At the time of examination, the ages of the patients erozygous variants in CYP1B1 have been proposed as potential ranged from 14 to 96 years with a mean of 66.9 Ϯ 13.4. In total 178 factors governing severity in patients with POAG.17 In all these (44.4%) patients had a family history of glaucoma. reports, however, heterozygous CYP1B1 variants have also The 376 control subjects were all of German origin and recruited been found in healthy subjects, which raises questions about from the same geographic regions as the patients. In addition, control their role as disease-causing mutations. subjects underwent ophthalmic examination and were age and sex In a recent study, we reported a measurement method for matched. Thus, at the time of examination and inclusion in this study relative enzymatic activity (combining net enzymatic activity the ages ranged from 51 to 92 years with a mean of 73.9 Ϯ 6.4. They and protein abundance) and found variation in activity be- had IOP below 20 mm Hg, no glaucomatous disc damage, and no tween the major CYP1B1 haplotypes as well as either a drastic family history of glaucoma. Visual acuity was at least 0.8 or 20/25 and or an intermediate to mild reduction in activity of four different the media were clear for examination. CYP1B1 mutations (G61E, Y81N, N203S, and E229K), com- All patients were screened for the myocilin (MYOC), optineurin pared with that of the corresponding background haplotype.18 (OPTN) (data not shown), and WD repeat domain 36 (WDR36)22 A marked decrease of the relative activity was seen for variants
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