Gyrate atrophy (GA) of the choroid and retina is a rare genetic disease of autosomal recessive inheritance. It primarily affects the ocular tissues and occurs due to deficiency of the enzyme ornithine aminotransferase that leads to a 10 to 20 times increase in the plasma level of the amino acid ornithine, compared to the normal plasma levels, that is thought to result in the ocular manifestations associated with the condition. This occurs due to mutations in the ornithine aminotransferase (OAT) gene located on chromosome 10, which results in a decrease or absence of the activity of the enzyme OAT. The condition is characterized by the development of chorioretinal atrophic patches that start in the mid-peripheral retina in the first decade and spread centrally to the macular area, myopia, changes in the macula including cystic changes that appear in the first and second decades, and posterior subcapsular cataracts. Patients usually present with night blindness followed by visual field constriction and eventually diminution of central vision and blindness. The condition is diagnosed by the presence of the characteristic clinical picture, the presence of hyperornithinemia in plasma, and the detection of mutations in the OAT gene. Treatment mainly involves dietary modifications and management of complications.
Gyrate atrophy of the choroid and retina is a rare genetic condition of autosomal recessive inheritance that results from mutations affecting the OAT gene on chromosome 10q26, leading to deficiency of the pyridoxal-dependant mitochondrial enzyme OAT which normally metabolizes the amino acid ornithine into pyrroline-5-carboxylic acid. Currently, there are more than 60 reported mutations in the OAT gene that lead to GA. Defective ornithine metabolism leads to the accumulation of excessive ornithine in the plasma, urine, cerebrospinal fluid, and aqueous humor which is postulated to result in the manifestations of the condition possibly due to the toxic effects of hyperornithinemia, especially on the retinal pigment epithelial cells. The condition can also be associated with excessive excretion of lysine and cystine in the urine with a decrease in the plasma levels of lysine, glutamine, glutamic acid, ammonia, and creatine. Although the OAT enzyme is expressed in most tissues, the main pathological manifestations of the condition are those involving the eye.
Gyrate atrophy is a rare condition that, for unknown reasons, is reported to be particularly prevalent in Finland but has been reported in many other countries of the world including the USA, Japan, Germany, UK, India, China, Australia, France, Tunisia, Egypt, Korea, Brazil, Nepal, and Turkey. In Finland, the prevalence is estimated to be around 1 in 50,000. Myopia, night blindness, and visual field affection associated with the condition usually start in the first decade of life followed by a diminution of vision due to macular affection and cataract formation that usually follows in the second decade, however, the onset of central vision loss is highly variable and can occur at any age according to a Finnish study. Some studies have shown that females may retain larger visual fields when compared to males, with preservation of night vision; however, other studies have shown that the visual field is equally affected in both males and females. In a study comparing the natural history of Japanese patients to Finnish patients, there was a worse visual function in Japanese patients, which suggests that the natural history of the condition could be variable among patients from different populations. Patients, however, usually have worse than 20/200 vision between 40 and 55 years of age.
Deficiency of the pyridoxal-dependant mitochondrial enzyme OAT, which normally metabolizes the amino acid ornithine into pyrroline-5-carboxylic acid, leads to accumulation of ornithine in the plasma, urine, cerebrospinal fluid, and aqueous humor of patients with GA which is thought to result in the manifestations of the condition possibly due to the toxic effects of hyperornithinemia, especially on the retinal pigment epithelial cells, leading to progressive chorioretinal atrophy. Indeed, in a mouse model of GA, there was histopathologic evidence that the RPE is the initial site of damage in GA. OAT is expressed at high levels in the RPE and a lower level in the photoreceptors, and the RPE could be especially sensitive to ornithine accumulation in the case of OAT deficiency. RPE damage and atrophy may then lead to choriocapillaris atrophy leading to the characteristic chorioretinal degenerative patches seen in GA. Damage to photoreceptors in patients with GA could be the result of a combination of mechanisms, including direct toxicity from hyperornithinemia, damage from toxic residues produced by degenerating RPE cells, the inability of RPE cells to provide normal nutrition to the photoreceptors, reduced nutrition due to atrophy of the choriocapillaris, and breakdown of the blood-retinal barrier leading to an impaired photoceptor microenvironment that affects their normal function. This leads to a progressive deterioration of the visual field and, eventually, central visual acuity.
Other biochemical findings associated with GA include excessive excretion of lysine and cystine in the urine with a decrease in the plasma levels of lysine, ammonia, glutamine, and creatine. Several manifestations of GA, particularly central nervous system manifestations such as mental retardation and epilepsy, together with the associated muscle findings, may occur due to the secondary phosphocreatine deficiency that results from the inhibition of creatine synthesis due to the hyperornithinemia. This energy deficiency may also affect the function of the RPE, leading to chorioretinal atrophy.
Histopathologic studies of GA are rare. In a postmortem study of a patient with pyridoxine-responsive GA, the retina showed focal areas of atrophy of the photoreceptors with hyperplasia of the adjacent RPE. An abrupt transition from the almost-normal retina to the zone of the almost totally atrophic retina, RPE, and choroid was present in the retinal mid-periphery. Examination by electron microscopy revealed abnormalities in the mitochondria of the corneal endothelium and the non-pigmented epithelium of the ciliary body. There were also similar, albeit less severe, mitochondrial abnormalities affecting the photoreceptors.
In an adult domestic cat with a condition analogous to GA characterized by OAT deficiency and plasma hyperornithinemia, a postmortem study revealed atrophy of the RPE and photoreceptors throughout the fundus with an abnormal and discontinuous choriocapillaris layer.
In a study of OAT-deficient GA mouse models developed by gene targeting, there was marked swelling of the RPE cells with irregular shape and engorgement in mice on a standard diet. There was also an absence of the outer segments of photoreceptors, while the inner segments were disorganized and shortened. The outer nuclear layer was also markedly reduced in thickness. These changes were not apparent in mice on an arginine-restricted diet. The findings were also confirmed by electron microscopy.
Muscle biopsy of patients with GA typically shows gross fatty changes with type 2 muscle fiber atrophy and tubular aggregates.
Patients with gyrate atrophy of the choroid and retina usually present with night blindness and progressive visual field constriction in their first decade of life that occurs due to progressive peripheral chorioretinal degeneration. A family history of the condition may sometimes be present and lead to the early detection of the condition through screening in early childhood. Gradually progressive diminution of central visual acuity usually follows these manifestations, occurring later in the first or second decade due to the development of macular changes and posterior subcapsular cataracts. Macular changes associated with GA include intraretinal cystic spaces, cystoid macular edema, foveoschisis, epiretinal membrane, and atrophy. Myopia is also a commonly associated feature with the condition. Complications such as a macular hole and subfoveal choroidal neovascularization can also occur but lead to a more severe and acute diminution of central visual acuity. Most patients will usually become legally blind (vision less than 20/200) between 40 and 55 years of age due to the late macular involvement by the chorioretinal atrophy.
On ophthalmoscopy, the peripheral chorioretinal degeneration appears as discrete scalloped areas of chorioretinal atrophy that progressively coalesce together and have pigmented edges with visible large choroidal vessels underneath. These atrophic patches usually start in the retinal mid-periphery but later spread to the macular area centrally and to the ora serrata peripherally to involve the whole retina with resultant visual field deterioration. They can also be associated with peripapillary atrophy. Retinal crystals may also be present. The normal foveal reflex may not be apparent due to the associated macular cystic changes. Cataract associated with GA is usually of the posterior subcapsular type and is best appreciated by the slit-lamp biomicroscopy or direct ophthalmoscopy using the red reflex. Choroidal neovascularization is suspected by the presence of a subretinal greyish-yellow lesion with surrounding subretinal fluid, hemorrhage, and exudates.
Although ophthalmic features are the main manifestations of GA, several central nervous system manifestations may also be associated with the condition, including aggressive behavior, mental retardation, and epilepsy. Peripheral nervous system abnormalities have also been reported, and patients may occasionally have muscular weakness.
The diagnosis of gyrate atrophy of the choroid and retina depends on the presence of the characteristic clinical features of the condition and the presence of elevated plasma ornithine level, which is essential for the diagnosis of the condition and is usually 10 to 20 times higher than the normal plasma ornithine level. Other laboratory findings include excessive excretion of lysine and cystine in the urine with a decrease in the plasma levels of lysine, glutamine, and creatine. Deficiency of the OAT enzyme activity can also be demonstrated in cultured skin fibroblasts of patients, which may also be partially deficient in carriers. There are currently more than 60 known mutations in the OAT gene that lead to GA, and the detection of these mutations can help confirm the diagnosis. Because the condition is inherited in an autosomal recessive manner, it is important to screen the relatives of patients, especially their siblings, since early treatment may result in better long term visual outcomes. Patients with GA have been found to have abnormally slow background electroencephalogram activity with focal and epileptogenic lesions, and some patients may also have mental retardation, aggressive behavior, or epilepsy. Some patients also show degenerative lesions and atrophic changes in brain magnetic resonance imaging with severe creatine deficiency detected on brain magnetic resonance spectroscopy. Electromyography may also be abnormal with a myopathic pattern, and muscle biopsy may show atrophy, which may also be related to creatine deficiency.
Regarding the ophthalmic evaluation of the condition, fluorescein angiography of patients with GA shows prominent retinal pigment epithelium (RPE) transmission window defects which start in the peripheral retina and correspond to the areas of RPE and choriocapillaris atrophy that characterize the disease with a hyperfluorescent lining along the borders of these defects. Large choroidal vessels are clearly seen through these defects. These defects gradually enlarge in size on follow-up and progress to coalesce together. Some patients also have cystoid macular edema associated with macular leakage. Others, such as patients with foveoschisis, do not have macular leakage. Later, the macula can also be involved with chorioretinal atrophy. Fluorescein angiography can also demonstrate leakage in cases of GA complicated by choroidal neovascularization.
Electroretinography (ERG) reveals diminished a and b wave responses of both rods and cones, which become undetectable in advanced disease; however, a nearly normal ERG in association with GA has also been reported.
There are also abnormalities detected in the electrooculography and dark adaptometry of patients.
Visual field testing is useful in follow-up using both static and kinetic perimetry and shows progressive visual field constriction and loss of sensitivity with age, which can be slowed with appropriate treatment. The visual field is also important for consideration for driving and to determine the visual disability status.
Microperimetry, which applies targeted stimuli to discrete areas of the retina, may also be useful in testing macular sensitivity and function, which depends on the severity of macular affection.
Fundus autofluorescence, which is an indicator of RPE structure, may help demonstrate and follow up areas of chorioretinal atrophy as characteristic hypoautofluorescent areas.
Optical coherence tomography is useful in the evaluation of the macular area and can show variable features including intraretinal cystic spaces. cystoid macular edema, foveoschisis, macular hole, choroidal neovascularization, epiretinal membranes, foveal thinning, outer retinal tubulations, and choroidal thinning.
Optical coherence tomography angiography findings in patients with GA have been recently described and include superficial and deep retinal ischemia, perifoveal deep retinal microvascular alterations, enlargement of the foveal avascular zone and decreased macular vascular density.
Treatment of gyrate atrophy consists mainly of dietary modifications to help lower the elevated systemic ornithine levels. The restriction of arginine in the diet, the precursor amino acid for ornithine, has been found to effectively lower plasma ornithine levels and to retard the progression of chorioretinal degeneration in both human and GA mouse models. Some patients, however, continue to develop progressive chorioretinal degeneration and electroretinographic changes despite lowered plasma ornithine levels following arginine restriction, which could be due to the genetic heterogeneity associated with the condition. Food rich in arginine that should be avoided or reduced in the diet includes nuts, seeds, cereal, dairy products, seafood, meat, chicken, watermelon, and chocolate.
Some patients may also benefit from vitamin B6 supplementation in lowering their plasma ornithine levels, which acts by increasing the activity of the pyridoxine-dependant OAT enzyme, while other patients do not. These are known as pyridoxine responders and non-responders, respectively, which has been proven by both in vivo and in vitro methods. This is possibly due to the different mutations that affect the OAT gene. The dose of vitamin B6 supplementation used for patients with GA in studies is variable and has ranged from around 120 to 600 mg/day.
Creatine supplementation may also have a role in retarding the chorioretinal degeneration and in improving neurological and muscular manifestations. Other dietary modifications that could be of benefit include proline and lysine supplementation.
Examination of the fundus of the family members is very crucial to detect the disease in an early stage and to start intervention early so that the methods to reduce progression can be tried.
Refraction and low vision aid form an important part of management and may improve the quality of life of the patient.
Treatment of cystoid macular edema and intraretinal cystic spaces associated with GA includes restriction of arginine in diet, vitamin B6 supplementation, topical and oral carbonic anhydrase inhibitors, topical non-steroidal anti-inflammatory drugs, intravitreal or subtenon steroid injections which, however, carry the risk of cataract progression and intraocular pressure elevation, and intravitreal antivascular endothelial growth factor injections. In cases of foveoschisis with no apparent macular leakage on fluorescein angiography, carbonic anhydrase inhibitors could be used.
Treatment of ocular complications of GA includes cataract surgery for visually significant cataract which may also be associated with zonular weakness, pars plana vitrectomy for macular holes, rhegmatogenous retinal detachments, and vitreous hemorrhage, and intravitreal antivascular endothelial growth factor injections for choroidal neovascularization.
The differential diagnosis of gyrate atrophy includes the following conditions:
These conditions can be differentiated from GA on the basis of the patient's history, inheritance pattern, clinical picture, laboratory findings, genetic analysis, electrophysiology, and multimodal imaging analysis.
Patients with Gyrate atrophy, especially children, who are undergoing arginine restriction in their diet with low total protein intake should receive enough calories in their diet supplemented by essential amino acids, vitamins, and minerals to avoid malnutrition and excessive break down of their endogenous proteins.
Four stages of gyrate atrophy have been described according to the disease progression :
Patients with GA usually present with progressive night blindness and visual field constriction that starts in the first decade due to progressive chorioretinal degeneration, which can usually be slowed down by arginine restriction in their diet and vitamin B6 supplementation occasionally leading to a picture similar to early retinitis pigmentosa. This is followed by a diminution of the central visual acuity, which usually occurs in the first or second decade due to progressive macular changes and cataract formation, which can be managed by treatment of the macular conditions and cataract extraction, respectively, leading to visual acuity improvement. Irreversible loss of vision and blindness (vision less than 20/200) occurs when the chorioretinal atrophy reaches the central macular area, which usually occurs between 40 and 55 years of age. This, however, can be variable depending on several factors, including treatment. The development of certain complications associated with GA such as macular holes, subfoveal choroidal neovascularization, and retinal detachment can lead to an earlier and more severe loss of vision.
Patients and their parents must be educated about the condition and the importance of long-term compliance with dietary modifications, including the restriction of arginine in their diet since this has been shown to influence the visual function of the patients greatly. Screening of family members of patients is also very important to allow dietary measures to be implemented at an early age since this was also shown to influence the visual outcome greatly.
The proper management of gyrate atrophy of the choroid and retina requires the combined efforts of pediatricians, ophthalmologists, neurologists, geneticists, dieticians, and other health professionals. Only effective interprofessional communication between these health care providers across a wide range of disciplines, and with patients and their parents, can ensure that proper care is delivered to these patients. The currently most effective approach in the management of GA is the early diagnosis of the condition followed by dietary modifications, specifically the restriction of arginine in the diet, and treatment of complications. This can be achieved by the early screening and referral of patients followed by proper patient education, evidence-based management, and long-term follow up. Currently, however, most of the evidence regarding the treatment of this rare autosomal recessive condition and its complication comes from historical cohort studies and case series. [Level 4 and 5]
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