Floating-Harbor syndrome with chorioretinal colobomas.

BACKGROUND: We present a case of a child with Floating-Harbor Syndrome (FHS) with bilateral chorioretinal coloboma (CC). To the best of our knowledge, this is the first case report of this association. Floating- Harbor syndrome is an extremely rare autosomal dominant genetic disorder with approximately 100 cases reported. It is characterized by a series of atypical features that include short stature with delayed bone age, low birth weight, skeletal anomalies, delayed speech development, and dysmorphic facial characteristics that typically portray a triangular face, deep-set eyes, long eyelashes, and prominent nose. MATERIALS AND METHODS: Our patient was examined by a pediatric ophthalmologist for the time at age of 7. Visual acuity, optical coherence tomography (OCT) and Optos imaging were collected on every visit. The patient had whole genome sequencing ordered by a pediatric geneticist to confirm Floating-Harbor syndrome. RESULTS: We present the patient's OCT and Optos images that illustrate the location of the patient's inferior chorioretinal coloboma in both eyes. The whole genome sequencing report collected revealed a heterozygous de novo pathogenic variant in the SRCAP gene, consistent with a Floating-Harbor syndrome diagnosis in the literature. DISCUSSION: Both genetic and systemic findings are consistent with the diagnosis of Floating-Harbor syndrome in our patient. Rubenstein-Taybi and Floating-Harbor syndrome share a similarity in molecular and physical manifestations, but because of the prevalence in Rubenstein-Taybi diagnoses, it is a syndromic condition that includes coloboma and frequently associated with each other. Therefore, a retinal exam should become part of the standard protocol for those with FHS, as proper diagnosis, examination and treatment can prevent irreversible retinal damage.

Exudative retinal detachment after laser in retinopathy of prematurity.

Treatment of retinopathy of prematurity with laser photocoagulation can be very effective in preventing future blindness, but its complications should be well understood by the ophthalmologists performing the treatment. We present the case of a 4-month-old girl in whom laser photocoagulation led to an exudative retinal detachment in both eyes. The fluid eventually resolved after treatment with topical and systemic steroids, but the effects of persistent fluid led to permanent photoreceptor loss. Optical coherence tomography can be useful in diagnosing the complication of exudative retinal detachment after laser photocoagulation and monitoring treatment response.

Cutting Edge: Enhanced Antitumor Immunity in ST8Sia6 Knockout Mice.

Inhibitory receptors have a critical role in the regulation of immunity. Siglecs are a family of primarily inhibitory receptors expressed by immune cells that recognize specific sialic acid modifications on cell surface glycans. Many tumors have increased sialic acid incorporation. Overexpression of the sialyltransferase ST8Sia6 on tumors led to altered immune responses and increased tumor growth. In this study, we examined the role of ST8Sia6 on immune cells in regulating antitumor immunity. ST8Sia6 knockout mice had an enhanced immune response to tumors. The loss of ST8Sia6 promoted an enhanced intratumoral activation of macrophages and dendritic cells, including upregulation of CD40. Intratumoral regulatory T cells exhibited a more inflammatory phenotype in ST8Sia6 knockout mice. Using adoptive transfer studies, the change in regulatory T cell phenotype was not cell intrinsic and depended on the loss of ST8Sia6 expression in APCs. Thus, ST8Sia6 generates ligands for Siglecs that dampen antitumor immunity.

Referable Macular Hemorrhage-A Clinically Meaningful Screening Target in Newborn Infants. Position Statement of the Association of Pediatric Retina Surgeons.

Universal newborn eye screening facilitates early diagnosis of ocular abnormalities and mitigates vision loss. "Referral warranted" eye disease is present at birth in about 5.5% of term infants, with "macular hemorrhage impinging on the fovea" representing about 50% of referral warranted disease. The Association of Pediatric Retina Surgeons held a symposium on February 9, 2021 that culminated in a position statement on "referable macular hemorrhage" (RMH) in newborn infants. RMH is meaningful in that in can cause amblyopia through deprivation, can be readily captured with wide-angle photography in a safe and efficient manner, and may lead to early intervention with mitigation of vision loss. [Ophthalmic Surg Lasers Imaging Retina. 2022;53:3-6.].

Multiple Evanescent White-Dot Syndrome in a 9-Year-Old Girl.

Purpose: This work describes a case of multiple evanescent white-dot syndrome (MEWDS) in a 9-year-old girl. Methods: A case report is presented. Results: A case of MEWDS in a 9-year-old girl is described. Conclusions: To our knowledge this is the youngest presentation of MEWDS discussed in the literature. MEWDS should be considered in the differential diagnosis of ocular inflammation in the first decade of life.

Laser Prophylaxis in Patients with Stickler Syndrome.

PURPOSE: To evaluate the association among laser prophylaxis treatment, retinal detachment (RD), and visual acuity (VA) in patients with Stickler syndrome (SS). DESIGN: Retrospective comparative case series. PARTICIPANTS: Patients with SS. METHODS: Patients received extended vitreous base laser (EVBL), nonprotocol laser (NPL), or no laser prophylaxis treatment of any kind. MAIN OUTCOME MEASURES: The 2 main outcome measures that were examined in these patients were rates of RD and VA. RESULTS: In this study, 230 eyes of 115 patients were included. Fifty-nine patients were women (51%). The median age at the time of laser prophylaxis treatment was 9.5 years (interquartile range [IQR], 6-13 years), and the median age of patients with RD was 11 years (IQR, 7-18 years). Of the 230 eyes, 92 did not undergo any laser treatment, 9 received NPL treatment, and 129 received EVBL treatment. Of the 129 eyes that underwent EVBL treatment, 4 (3%) had RD, compared with 74 eyes (73%) that had RD and did not receive laser or NPL treatment (P < 0.001). Eyes that received EVBL treatment had approximately 8 lines better vision, on average, compared with those that did not receive laser or NPL treatment (-0.86 logarithm of the minimum angle of resolution; 95% confidence interval,-1.1 to -0.64; P < 0.001). CONCLUSIONS: Treatment with EVBL seems to reduce the rate of subsequent RD and is associated with better VA in patients with SS.

Intramolecular Ring-Opening Decomposition of Aryl Azetidines.

The ring strain present in azetidines can lead to undesired stability issues. Herein, we described a series of N-substituted azetidines which undergo an acid-mediated intramolecular ring-opening decomposition via nucleophilic attack of a pendant amide group. Studies were conducted to understand the decomposition mechanism enabling the design of stable analogues.

Case report: A case of Norrie disease due to deletion of the entire coding region of NDP gene.

PURPOSE: Norrie disease is a rare X-linked recessive vitreoretinopathy. Variants of the NDP gene are associated with this condition. This case reports aims to demonstrate the variations of clinical presentations and exam findings of this disease. OBSERVATIONS: A retrospective chart review of the patient's ocular and systemic findings and imaging results was performed. The patient had received genetic testing, including mutational analysis of targeted genes associated with retrolental masses. The patient had a comprehensive eye exam for bilateral leukocoria, demonstrating large retrolental masses, anterior polar cataracts, stretched ciliary processes, and roving eye movements. B-scan ultrasonography and magnetic resonance imaging indicated total, funnel-shaped retinal detachments, which is a unique retinal configuration in Norrie disease. Genetic testing confirmed deletion of the coding region of all three exons in the NDP gene, which confirmed Norrie disease. He has not shown any extraocular involvement to date. CONCLUSIONS AND IMPORTANCE: This is a case demonstrating the association between deletion of the coding region NDP gene and Norrie disease. The phenotypical variation of this disease warrants further studies of genotype-phenotype correlations and mutations of the NDP gene.

ST8Sia6 Promotes Tumor Growth in Mice by Inhibiting Immune Responses.

Many tumors exhibit increased incorporation of sialic acids into cell-surface glycans, which impact the tumor microenvironment. Sialic acid immunoglobulin-like lectins (Siglec) are receptors that recognize sialic acids and modulate immune responses, including responses to tumors. However, the roles of individual sialyltransferases in tumorigenesis and tumor growth are not well understood. Here, we examined the sialyltransferase ST8Sia6, which generated α2,8-linked disialic acids that bind to murine Siglec-E and human Siglec-7 and -9. Increased ST8Sia6 expression was found on many human tumors and associated with decreased survival in several cancers, including colon cancer. Because of this, we engineered MC38 and B16-F10 tumor lines to express ST8Sia6. ST8Sia6-expressing MC38 and B16-F10 tumors exhibited faster growth and led to decreased survival, which required host Siglec-E. ST8Sia6 expression on tumors also altered macrophage polarization toward M2, including upregulation of the immune modulator arginase, which also required Siglec-E. ST8Sia6 also accelerated tumorigenesis in a genetically engineered, spontaneous murine model of colon cancer, decreasing survival from approximately 6 months to 67 days. Thus, ST8Sia6 expression on tumors inhibits antitumor immune responses to accelerate tumor growth.

Traumatic Retinal Detachment in Patients with Self-Injurious Behavior: An International Multicenter Study.

PURPOSE: To describe the clinical characteristics, surgical outcomes, and management recommendations in patients with traumatic rhegmatogenous retinal detachment (RRD) resulting from self-injurious behavior (SIB). DESIGN: International, multicenter, retrospective, interventional case series. PARTICIPANTS: Patients with SIB from 23 centers with RRD in at least 1 eye. METHODS: Clinical histories, preoperative assessment, surgical details, postoperative management, behavioral intervention, and follow-up examination findings were reviewed. MAIN OUTCOME MEASURES: The rate of single-surgery anatomic success (SSAS) was the primary outcome. Other outcomes included new RRD in formerly attached eyes, final retinal reattachment, and final visual acuity. RESULTS: One hundred seven eyes with RRDs were included from 78 patients. Fifty-four percent of patients had bilateral RRD or phthisis bulbi in the fellow eye at final follow-up. The most common systemic diagnoses were autism spectrum disorder (35.9%) and trisomy 21 (21.8%) and the most common behavior was face hitting (74.4%). The average follow-up time was 3.3 ± 2.8 years, and surgical outcomes for operable eyes were restricted to patients with at least 3 months of follow-up (81 eyes). Primary initial surgeries were vitrectomy alone (33.3%), primary scleral buckle (SB; 26.9%), and vitrectomy with SB (39.7%), and 5 prophylactic SBs were placed. Twenty-three eyes (21.5%) with RRDs were inoperable. The SSAS was 23.1% without tamponade (37.2% if including silicone oil), and final reattachment was attained in 80% (36.3% without silicone oil tamponade). Funnel-configured RRD (P = 0.006) and the presence of grade C proliferative vitreoretinopathy (P = 0.002) correlated with re-detachment. The use of an SB predicted the final attachment rate during the initial surgery (P = 0.005) or at any surgery (P = 0.008. These associations held if restricting to 64 patients with ≥12 months followup. Anatomic reattachment correlated with better visual acuity (P < 0.001). CONCLUSIONS: RRD resulting from SIB poses therapeutic challenges because of limited patient cooperation, bilateral involvement, chronicity, and ongoing trauma in vulnerable and neglected patients. The surgical success rates were some of the lowest in the modern retinal detachment literature. The use of an SB may result in better outcomes, and visual function can be restored in some patients.

Macular Sequelae Following Exudative Retinal Detachment After Laser Photocoagulation for Retinopathy of Prematurity.

BACKGROUND AND OBJECTIVE: To report a series of exudative retinal detachments (ERDs) following laser photocoagulation for retinopathy of prematurity (ROP). PATIENTS AND METHODS: Retrospective case series. RESULTS: Eleven eyes of seven infants were identified who developed ERD following laser. Median gestation age was 25 weeks (interquartile range [IQR]: 24-27 weeks), and median birth weight was 662 grams (IQR: 538-850 grams). Median postmenstrual age at time of laser was 35 weeks (IQR: 33-39 weeks). ERD was diagnosed at a median of 7 days (IQR: 5-7 days) after laser and was managed with steroids. Bevacizumab was also used for certain cases. Time to resolution ranged from 1 to 5 weeks. Macular pigment changes, atrophy, window defect on fluorescein angiography, and photoreceptor loss on optical coherence tomography were noted in some cases following ERD resolution. Excluding one patient who expired at 3 months, median length of follow-up was 10 years (IQR: 9-13.5 years). Overall, only one patient, who presented with less severe ERD, had normal vision. CONCLUSIONS: ERD is an uncommonly reported complication following laser for ROP. Macular changes following ERD resolution may have negative visual consequences. [Ophthalmic Surg Lasers Imaging Retina. 2020;51:698-705.].

Cutting Edge: ST8Sia6-Generated α-2,8-Disialic Acids Mitigate Hyperglycemia in Multiple Low-Dose Streptozotocin-Induced Diabetes.

The immune system contains a series of checks and balances that maintain tolerance and prevent autoimmunity. Sialic acid-binding Ig-type lectins (Siglecs) are cell surface receptors found on immune cells and inhibit inflammation by recruiting protein tyrosine phosphatases to ITIMs. Islet-resident macrophages express Siglec-E, and Siglec-E expression decreases on islet-resident macrophages as insulitis progresses in the NOD mouse. The sialyltransferase ST8Sia6 generates α-2,8-disialic acids that are ligands for Siglec-E in vivo. We hypothesized that engaging Siglec-E through ST8Sia6-generated ligands may inhibit the development of immune-mediated diabetes. Constitutive overexpression of ST8Sia6 in pancreatic ß cells mitigated hyperglycemia in the multiple low-dose streptozotocin model of diabetes, demonstrating that engagement of this immune receptor facilitates tolerance in the setting of inflammation and autoimmune disease.

Late visual outcomes in infants treated with primary bevacizumab for type 1 retinopathy of prematurity.

PURPOSE: To describe visual acuity findings after 4 years of age in infants treated with primary bevacizumab (IVB) for type 1 retinopathy of prematurity (ROP) and to correlate structural findings on fluorescein angiography (FA) with functional outcomes. METHODS: Infants born between January 2011 and January 2014 were identified by review of the medical records. Visual acuity was measured in clinic after 4 years of age. As described in the ET-ROP study, normal visual acuity was 20/40 (logMAR 0.3) or better. Examination under anesthesia with FA and prophylactic laser if necessary was recommended for all patients who received primary IVB. Vascular abnormalities were reviewed by 2 experts. RESULTS: A total of 23 infants (46 eyes) completed visual acuity testing. Median age was 6 years (IQR, 4-7). Median visual acuity was logMAR 0.18 (IQR, 0-0.3). Normal vision was recorded for 39/46 (85%) eyes. Twenty-one patients (42 eyes) completed an examination under anesthesia with FA. All eyes had some peripheral capillary abnormalities (shunts, tangles, or abnormal branching); most had peripheral nonperfusion (90%) and leakage (64%). CONCLUSIONS: Most eyes treated with IVB for type 1 ROP had normal visual acuity. Our results after IVB in this study compare favorably to 6-year visual outcomes in the ET-ROP study, in which 34.6% of early-treated eyes had normal visual acuity (20/40 or better). Nonetheless, a high percentage of eyes had abnormal vascular patterns on FA, which may be related to underlying ROP or to treatment. Peripheral vascular changes are common in eyes with ROP treated with IVB, but they do not preclude excellent visual acuity.

Late-Onset Retinal Findings and Complications in Untreated Retinopathy of Prematurity.

PURPOSE: To investigate late retinal findings and complications of eyes with a history of retinopathy of prematurity (ROP) that did not meet treatment criteria and did not receive treatment during infancy. DESIGN: Retrospective, nonconsecutive, noncomparative, multicenter case series. PARTICIPANTS: Three hundred sixty-three eyes of 186 patients. METHODS: Data were requested from multiple providers on premature patients with a history of ROP and no treatment during infancy who demonstrated late retinal findings or complications and included age, gender, gestational age and weight, zone and stage at infancy, visual acuity, current retina vascularization status, vitreous character, presence of peripheral retinal findings such as lattice retinal tears and detachments (RDs), retinoschisis, and fluorescein findings. MAIN OUTCOME MEASURES: Rate of RDs and factors conferring a higher risk of RDs. RESULTS: The average age was 34.5 years (range, 7-76 years), average gestational age was 26.6 weeks (range, 23-34 weeks), and average birth weight was 875 g (range, 425-1590 g). Findings included lattice in 196 eyes (54.0%), atrophic holes in 126 eyes (34.7%), retinal tears in 111 eyes (30.6%), RDs in 140 eyes (38.6 %), tractional retinoschisis in 44 eyes (11.9%), and visible vitreous condensation ridge-like interface in 112 eyes (30.5%). Fluorescein angiography (FA) was performed in 113 eyes, of which 59 eyes (52.2%) showed leakage and 16 eyes (14.2%) showed neovascularization. Incomplete vascularization posterior to zone 3 was common (71.6% of eyes). Retinal detachments were more likely in patients with a gestational age of 29 weeks or less (P < 0.05) and in eyes with furthest vascularization to posterior zone 2 eyes compared with zone 3 eyes (P = 0.009). CONCLUSIONS: Eyes with ROP not meeting the treatment threshold during infancy showed various late retinal findings and complications, of which RDs were the most concerning. Complications were seen in all age groups, including patients born after the Early Treatment for Retinopathy of Prematurity Study. Contributing factors to RDs included atrophic holes within peripheral avascular retina, visible vitreous condensation ridge-like interface with residual traction, and premature vitreous syneresis. We recommend regular examinations and consideration of ultra-widefield FA examinations. Prospective studies are needed to explore the frequency of complications and benefit of prophylactic treatment and if eyes treated with anti-vascular endothelial growth factor therapy are at risk of similar findings and complications.

Chromatin-Modifying Enzymes in T Cell Development.

T cell development involves stepwise progression through defined stages that give rise to multiple T cell subtypes, and this is accompanied by the establishment of stage-specific gene expression. Changes in chromatin accessibility and chromatin modifications accompany changes in gene expression during T cell development. Chromatin-modifying enzymes that add or reverse covalent modifications to DNA and histones have a critical role in the dynamic regulation of gene expression throughout T cell development. As each chromatin-modifying enzyme has multiple family members that are typically all coexpressed during T cell development, their function is sometimes revealed only when two related enzymes are concurrently deleted. This work has also revealed that the biological effects of these enzymes often involve regulation of a limited set of targets. The growing diversity in the types and sites of modification, as well as the potential for a single enzyme to catalyze multiple modifications, is also highlighted.

FEVR phenotype associated with septo-optic dysplasia.

Background: Septo-optic dysplasia, also known as de Morsier syndrome, is a disorder of brain development characterized by optic nerve hypoplasia, hypopituitarism, and midline brain defects.Materials and Methods: Single retrospective case report.Results: An infant born at 38 5/7 weeks gestation age weighing 3125 g developed respiratory distress shortly after birth. Systemic findings included myocardial dysfunction, hypopituitarism, feeding intolerance, microphallus, and dysmorphic features. Eye examination revealed tractional retinal detachments and optic nerve hypoplasia. In addition, peripheral non-perfusion and peripheral neovascularization were consistent with Familial Exudative Vitreoretinopathy (FEVR) phenotype. MRI showed hypoplastic optic nerves, ectopic posterior pituitary with hypoplastic pituitary infundibulum, and slightly thin corpus callosum, diagnostic of septo-optic dysplasia. Genetic testing revealed no pathogenic variants and two variants of uncertain significance.Conclusion: FEVR findings can be associated with septo-optic dysplasia and may point to an etiologic connection between neural development and subsequent vascular development.

The Interaction between NKAP and HDAC3 Is Critical for T Cell Maturation.

NKAP and HDAC3 are critical for T cell maturation. NKAP and HDAC3 physically associate, and a point mutation in NKAP, NKAP(Y352A), abrogates this interaction. To evaluate the significance of NKAP and HDAC3 association in T cell maturation, transgenic mice were engineered for cre-mediated endogenous NKAP gene deletion coupled to induction of NKAP(Y352A) or a wild type (WT) control transgene, NKAP(WT), in double positive thymocytes or regulatory T cells (Tregs). T cell maturation was normal in mice with endogenous NKAP deletion coupled to NKAP(WT) induction. However, severe defects occurred in T cell and Treg maturation and in iNKT cell development when NKAP(Y352A) was induced, recapitulating NKAP deficiency. Conventional T cells expressing NKAP(Y352A) failed to enter the long-term T cell pool, did not produce cytokines, and remained complement susceptible, whereas Tregs expressing NKAP(Y352A) were eliminated as recent thymic emigrants leading to lethal autoimmunity. Overall, these results demonstrate the significance of NKAP-HDAC3 association in T cells.