Deletion upstream of MAB21L2 highlights the importance of evolutionarily conserved non-coding sequences for eye development. Nat Commun 2024 Oct 26;15(1):9245
Date
10/26/2024Pubmed ID
39455595Pubmed Central ID
PMC11511899DOI
10.1038/s41467-024-53553-2Scopus ID
2-s2.0-85207625328 (requires institutional sign-in at Scopus site) 4 CitationsAbstract
Anophthalmia, microphthalmia and coloboma (AMC) comprise a spectrum of developmental eye disorders, accounting for approximately 20% of childhood visual impairment. While non-coding regulatory sequences are increasingly recognised as contributing to disease burden, characterising their impact on gene function and phenotype remains challenging. Furthermore, little is known of the nature and extent of their contribution to AMC phenotypes. We report two families with variants in or near MAB21L2, a gene where genetic variants are known to cause AMC in humans and animal models. The first proband, presenting with microphthalmia and coloboma, has a likely pathogenic missense variant (c.338 G > C; p.[Trp113Ser]), segregating within the family. The second individual, presenting with microphthalmia, carries an ~ 113.5 kb homozygous deletion 19.38 kb upstream of MAB21L2. Modelling of the deletion results in transient small lens and coloboma as well as midbrain anomalies in zebrafish, and microphthalmia and coloboma in Xenopus tropicalis. Using conservation analysis, we identify 15 non-coding conserved elements (CEs) within the deleted region, while ChIP-seq data from mouse embryonic stem cells demonstrates that two of these (CE13 and 14) bind Otx2, a protein with an established role in eye development. Targeted disruption of CE14 in Xenopus tropicalis recapitulates an ocular coloboma phenotype, supporting its role in eye development. Together, our data provides insights into regulatory mechanisms underlying eye development and highlights the importance of non-coding sequences as a source of genetic diagnoses in AMC.
Author List
Ceroni F, Cicekdal MB, Holt R, Sorokina E, Chassaing N, Clokie S, Naert T, Talbot LV, Muheisen S, Bax DA, Kesim Y, Kivuva EC, Vincent-Delorme C, Lienkamp SS, Plaisancié J, De Baere E, Calvas P, Vleminckx K, Semina EV, Ragge NKAuthor
Elena V. Semina PhD Chief, Professor in the Ophthalmology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AnimalsAnophthalmos
Coloboma
Conserved Sequence
Evolution, Molecular
Eye
Eye Proteins
Female
Homeodomain Proteins
Humans
Intracellular Signaling Peptides and Proteins
Male
Mice
Microphthalmos
Pedigree
Phenotype
Sequence Deletion
Xenopus
Xenopus Proteins
Zebrafish
Zebrafish Proteins
