PMID- 34895015 OWN - NLM STAT- Publisher LR - 20240220 IS - 1744-5094 (Electronic) IS - 1381-6810 (Linking) DP - 2021 Dec 13 TI - Best Vitelliform Macular Dystrophy (BVMD) is a phenocopy of North Carolina Macular Dystrophy (NCMD/MCDR1). PG - 1-11 LID - 10.1080/13816810.2021.2010771 [doi] AB - PURPOSE: North Carolina Macular Dystrophy (NCMD) and Best Vitelliform Macular Dystrophy (BVMD) are rare autosomal dominant macular dystrophies. Both BVMD and NCMD have markedly variable expressivity. In some individuals, it can be difficult to differentiate between the two disease entities. METHODS: Clinical findings including fundus photography, fundus autofluorescence (FAF), and spectral domain optical coherence tomography (SD-OCT) were evaluated in 5 individuals with NCMD and 3 with BMD. Electrooculography (EOG) was performed in 2 NCMD subjects. Molecular diagnosis was performed using Sanger DNA sequencing. IRB approval was obtained. RESULTS: Five NCMD subjects had clinical findings indistinguishable from three of our BVMD subjects. Molecular diagnosis was confirmed in all but one BVMD subject who had an abnormal EOG prior to discovery of the BEST1 gene. Two NCMD subjects had an abnormal EOG with a normal ERG, which has been considered a unique feature of BVMD. SD-OCT in one BVMD subject demonstrated a small lucency/excavation into the choroid similar to that in grade 3 lesions of NCMD. Two NCMD subjects had elevated sub-macular lesions giving a pseudo-vitelliform appearance on OCT similar to BVMD. CONCLUSION: Best Vitelliform Macular Dystrophy can be a phenocopy of NCMD. There is considerable clinical overlap between NCMD and BVMD, which can cause diagnostic inaccuracies. Our new findings demonstrate that like BVMD, NCMD can also have an abnormal EOG with a normal ERG. The overlapping phenotypes of BVMD with NCMD may provide insights into the mechanisms of the macular changes. FAU - Small, Kent W AU - Small KW AUID- ORCID: 0000-0002-5204-4959 AD - Department of ophthalmology, Molecular Insight Research Foundation, Glendale and Los Angeles, California, USA. AD - Department of ophthalmology, Macula and Retina Institute, Glendale and Los Angeles, California, USA. FAU - Jampol, Lee M AU - Jampol LM AD - Department of ophthalmology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA. FAU - Bakall, Benjamin AU - Bakall B AUID- ORCID: 0000-0003-1143-3007 AD - Department of ophthalmology, University of Arizona College of Medicine, Phoenix, Arizona, USA. FAU - Small, Leslie AU - Small L AD - Department of ophthalmology, University of California San Francisco, San Francisco, California, USA. FAU - Wiggins, Robert AU - Wiggins R AD - Department of ophthalmology, Asheville Eye Associates, North Carolina, USA. FAU - Agemy, Steven AU - Agemy S AD - Department of ophthalmology, SUNY Downstate Medical Center University, Brooklyn, New York, USA. FAU - Udar, Nitin AU - Udar N AD - Department of ophthalmology, Molecular Insight Research Foundation, Glendale and Los Angeles, California, USA. AD - Department of ophthalmology, Macula and Retina Institute, Glendale and Los Angeles, California, USA. FAU - Avetisjan, Jessica AU - Avetisjan J AD - Department of ophthalmology, Molecular Insight Research Foundation, Glendale and Los Angeles, California, USA. AD - Department of ophthalmology, Macula and Retina Institute, Glendale and Los Angeles, California, USA. FAU - Vincent, Andrea AU - Vincent A AUID- ORCID: 0000-0002-4185-3267 AD - Department of ophthalmology, University of Auckland, New Zealand Eye Centre, Auckland, New Zealand. FAU - Shaya, Fadi S AU - Shaya FS AUID- ORCID: 0000-0003-4955-4103 AD - Department of ophthalmology, Molecular Insight Research Foundation, Glendale and Los Angeles, California, USA. AD - Department of ophthalmology, Macula and Retina Institute, Glendale and Los Angeles, California, USA. LA - eng PT - Journal Article DEP - 20211213 PL - England TA - Ophthalmic Genet JT - Ophthalmic genetics JID - 9436057 SB - IM OTO - NOTNLM OT - Best Macular Dystrophy (BMD) OT - Best Vitelliform Macular Dystrophy (BVMD) OT - Electrooculogram (EOG) OT - North Carolina Macular Dystrophy (NCMD/MCDR1) OT - phenocopy EDAT- 2021/12/14 06:00 MHDA- 2021/12/14 06:00 CRDT- 2021/12/13 11:29 PHST- 2021/12/13 11:29 [entrez] PHST- 2021/12/14 06:00 [pubmed] PHST- 2021/12/14 06:00 [medline] AID - 10.1080/13816810.2021.2010771 [doi] PST - aheadofprint SO - Ophthalmic Genet. 2021 Dec 13:1-11. doi: 10.1080/13816810.2021.2010771.