1
|
Liu L, Guo D, Yang F, Qi H, Zhou Y, Zheng D, Jin G. Identification and phenotypic analysis of novel LTBP2 mutations in a Chinese cohort with congenital ectopia lentis. Mol Vis 2023; 29:169-179. [PMID: 38222456 PMCID: PMC10784221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 10/10/2023] [Indexed: 01/16/2024] Open
Abstract
Purpose To evaluate the frequency of LTBP2 mutations and to elaborate on LTBP2-related clinical phenotypes in a Chinese congenital ectopia lentis (CEL) cohort. Methods In total, 145 Chinese probands with CEL were recruited for this study and underwent ocular and systemic examinations. Whole-exome sequencing was used to identify mutations, and Sanger sequencing and bioinformatics analysis were further performed to verify pathogenic mutations. Results Overall, biallelic mutations in LTBP2 involving eight novel mutations (c.4370-7_4370-9delTCT, c.4370-5C>G, c.3452G>A, c.2253delG, c.4114T>C, c.1251G>A, c.4760G>A, and c.620G>A) were identified in four CEL probands (4/145, 2.76%). Patients with LTBP2 mutations were characterized by a megalocornea, spherophakia, high myopia, and glaucoma instead of a flat cornea, high corneal astigmatism, cardiovascular and skeletal abnormalities that were reported in other gene mutations. A novel homozygous frameshift mutation was detected, and this type of mutation was found to cause more complicated ocular symptoms than others, ranging from the anterior segment to the fundus. Conclusion This study reported the mutation frequency of the LTBP2 gene in a Chinese CEL cohort and provided novel insight into LTBP2-related genotype-phenotype associations in CEL.
Collapse
Affiliation(s)
- Liyan Liu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Dongwei Guo
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Fengmei Yang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Haotian Qi
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Yijing Zhou
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Danying Zheng
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Guangming Jin
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| |
Collapse
|
3
|
Barnard AM, Hammers DW, Triplett WT, Kim S, Forbes SC, Willcocks RJ, Daniels MJ, Senesac CR, Lott DJ, Arpan I, Rooney WD, Wang RT, Nelson SF, Sweeney HL, Vandenborne K, Walter GA. Evaluating Genetic Modifiers of Duchenne Muscular Dystrophy Disease Progression Using Modeling and MRI. Neurology 2022; 99:e2406-e2416. [PMID: 36240102 PMCID: PMC9687406 DOI: 10.1212/wnl.0000000000201163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 07/11/2022] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Duchenne muscular dystrophy (DMD) is a progressive muscle degenerative disorder with a well-characterized disease phenotype but considerable interindividual heterogeneity that is not well understood. The aim of this study was to evaluate the effects of dystrophin variations and genetic modifiers of DMD on rate and age of muscle replacement by fat. METHODS One hundred seventy-five corticosteroid treated participants from the ImagingDMD natural history study underwent repeated magnetic resonance spectroscopy (MRS) of the vastus lateralis (VL) and soleus (SOL) to determine muscle fat fraction (FF). MRS was performed annually in most instances; however, some individuals had additional visits at 3 or 6 monthss intervals. FF changes over time were modeled using nonlinear mixed effects to estimate disease trajectories based on the age that the VL or SOL reached half-maximum change in FF (mu) and the time required for FF change (sigma). Computed mu and sigma values were evaluated for dystrophin variations that have demonstrated the ability to lead to a mild phenotype as well as compared between different genetic polymorphism groups. RESULTS Participants with dystrophin gene deletions amenable to exon 8 skipping (n = 4) had minimal increases in SOL FF and had an increase in VL mu value by 4.4 years compared with a reference cohort (p = 0.039). Participants with nonsense variations within exons that may produce milder phenotypes (n = 11) also had minimal increases in SOL and VL FFs. No differences in estimated FF trajectories were seen for individuals amenable to exon 44 skipping (n = 10). Modeling of the SPP1, LTBP4, and thrombospondin-1 (THBS1) genetic modifiers did not result in significant differences in muscle FF trajectories between genotype groups (p > 0.05); however, trends were noted for the polymorphisms associated with long-range regulation of LTBP4 and THBS1 that deserve further follow-up. DISCUSSION The results of this study link the historically mild phenotypes seen in individuals amenable to exon 8 skipping and with certain nonsense variations with alterations in trajectories of lower extremity muscle replacement by fat.
Collapse
Affiliation(s)
- Alison M Barnard
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - David W Hammers
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - William T Triplett
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - Sarah Kim
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - Sean C Forbes
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - Rebecca J Willcocks
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - Michael J Daniels
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - Claudia R Senesac
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - Donovan J Lott
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - Ishu Arpan
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - William D Rooney
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - Richard T Wang
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - Stanley F Nelson
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - H Lee Sweeney
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - Krista Vandenborne
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville
| | - Glenn A Walter
- From the Department of Physical Therapy (A.M.B., W.T.T., S.C.F., R.J.W., C.R.S., D.J.L., K.V.) Pharmacology and Therapeutics (D.W.H., H.L.S.), University of Florida, Gainesville; Center for Pharmacometrics and Systems Pharmacology (S.K.), Department of Pharmaceutics, College of Pharmacy, University of Florida, Orlando; Department of Statistics (M.J.D.), University of Florida, Gainesville; Department of Neurology (I.A.), Oregon Health & Science University, Portland; Advanced Imaging Research Center (W.D.R.), Oregon Health & Science University, Portland; Department of Human Genetics (R.T.W., S.F.N.), University of California Los Angeles, CA; and Department of Physiology and Functional Genomics (G.A.W.), University of Florida, Gainesville.
| |
Collapse
|