Ocular Manifestations of Chordin-like 1 Knockout Mice.

Abstract:

PURPOSE:In humans, loss-of-function mutations in the gene encoding Chordin-like 1 (CHRDL1) cause X-linked megalocornea (MGC1), characterized by bilateral corneal enlargement, decreased corneal thickness, and increased anterior chamber depth (ACD). We sought to determine whether Chrdl1 knockout (KO) mice would recapitulate the ocular findings found in patients with MGC1. METHODS:We generated mice with a Chrdl1 KO allele and confirmed that male Chrdl1 hemizygous KO mice do not express Chrdl1 mRNA. We examined the eyes of male mice that were hemizygous for either the wild-type (WT) or KO allele and measured corneal diameter, corneal area, corneal thickness, endothelial cell density, ACD, tear volume, and intraocular pressure. We also harvested retinas and counted retinal ganglion cell numbers. Eye segregation pattern in the dorsal lateral geniculate nucleus were also compared between male Chrdl1 KO and WT mice. RESULTS:Male Chrdl1 KO mice do not have larger cornea diameters than WT mice. KO mice have significantly thicker central corneas (116.5 ± 3.9 vs. 100.9 ± 4.2 μm, P = 0.013) and smaller ACD (325.7 ± 5.7 vs. 405.6 ± 6.3 μm, P < 0.001) than WT mice, which is the converse of what occurs in patients who lack CHRDL1. Retinal-thalamic projections and other ocular measurements did not significantly differ between KO and WT mice. CONCLUSIONS:Male Chrdl1 KO mice do not have the same anterior chamber abnormalities seen in humans with CHRDL1 mutations. Therefore, Chrdl1 KO mice do not recapitulate the human MGC1 phenotype. Nevertheless, Chrdl1 plays a role during mouse ocular development because corneas in KO mice differ from those in WT mice.

journal_name

Cornea

journal_title

Cornea

authors

Chen D,Liu Y,Shu G,Chen C,Sullivan DA,Kam WR,Hann S,Fowler M,Warman ML

doi

10.1097/ICO.0000000000002371

subject

Has Abstract

pub_date

2020-09-01 00:00:00

pages

1145-1150

issue

9

eissn

0277-3740

issn

1536-4798

journal_volume

39

pub_type

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