|Classification and external resources|
Batten’s disease (Juvenile Neuronal Ceroid Lipofuscinosis, JNCL) was named after Dr. Frederick E. Batten, a British pediatrician who first discovered it. The disease is a member of a group of neurodegenerative disorders characterized by lysosomal accumulation of lipopigments. This family is known as neuronal ceroid lipofuscinoses and members are classified according to age of onset. (1) The juvenile onset form is the most common neurodegenerative disease in childhood. It is inherited in an autosomal recessive pattern. Hallmarks of the disease include rapid vision loss due to retinal degeneration, progressive intellectual and motor deterioration, seizures, and early death.
Batten’s disease is the most common neurodegenerative disorder in childhood. It is caused by a mutation in the CLN3 gene which is inherited in an autosomal recessive pattern mostly in caucasian populations. The CLN3 mutation has reported incidences that range from 0.02-4.8 per 100,000 worldwide. (2,3) With advancements in genetic analyses and databases, the carrier frequencies for the most common mutation have been estimated. In Finnish and non-finnish europeans, the estimated frequencies are 1/558 and 1/380, whereas in Latinos and USA it is estimated to be 1/1169 and 1/506.(4)
The pathophysiology of JNCL has been further elucidated with genetic and molecular advancements.
JNCL is primarily caused by a mutation in the CLN3 gene. Discovered in 1995, the CLN3 gene is located on the short arm of chromosome 16 at position 12.1 and codes for the lysosomal and endosomal protein battenin. Battenin is 438 amino acids long and has six transmembrane domains. (5) Its precise function is currently unknown, but it is believed to facilitate endocytosis, autophagy, regulation of lysosomal pH, transport of lysosomal enzyme transporters, osmoregulation, apoptosis, cell-cycle regulation, and protein secretion. (6,7) Approximately 67 different mutations have been identified in Batten’s.(8) The most common mutation in CLN3 is the 1.02 kb deletion resulting in a truncated battenin with residual function. (9,10) As a result of diminished function, accumulation of autofluorescent ceroid material within neuronal lysosomes causes neurotoxicity and degeneration. Approximately 76% of patients with JNCL are homozygous for this mutation, whereas 22% of patients have compound heterozygosity. (5)
In addition to the CLN3 mutation, there have been discoveries suggesting an autoimmune component contributes to JNCL.
Autoantigens and antibodies have been identified in patients with JNCL. Increased levels of alpha-fetoprotein are present in neural tissue. (11) It has been noted that anti-glutamic acid decarboxylase (GAD) antibodies are elevated in Batten’s. The enzyme converts glutamate to GABA. This specific antibody inhibits the GAD enzyme and leads to excess glutamate toxicity in neurons (12,13) These autoantibodies target a region of GAD that is different from the anti-GAD antibodies seen in Type 1 diabetes or stiff person syndrome. (14) However, the association between anti-GAD and JNCL has been disputed. It was shown that JNCL sera did not exclusively react with GAD65+ neurons, but also stained other cell populations. Furthermore, sera from patients with Type 1 diabetes, a disease with present anti-GAD65 antibodies, stained differently from JNCL sera. These findings suggest there are other autoreactive antibodies at play in Batten’s. (15)
The CLN3 mutation is known to affect antigen presenting cells. These cells express higher levels of CD11c which localizes to lipid rafts known to be abnormal in these cells. These same APCs also show altered cytokine secretion and increased adhesive properties. (16) In CLN3 deficient murine models, microglia expressed higher levels of sialoadhesin, a adhesive molecule that promotes neuroinflammation and perturbation of the nervous system. (17)
Screening and Diagnosis
Typically, the first signs of Batten’s Disease are visual failure, followed by seizures, ataxia, and psychiatric symptoms.(20) In patients presenting with such characteristic clinical features, or with reminiscent symptoms in the context of an elevated clinical suspicion (positive family history, unusual physical exam finding) diagnostic testing should be initiated.
Historically, the diagnosis of Batten’s Disease was made based on the presenting clinical features along with histopathologic examination of skin and rectal biopsies, using electron microscopy, to determine accumulation of characteristic autofluorescent storage materials.(21) Specifically, electron microscopy allows for visualization of the curvilinear inclusions and fingerprint profiles in lysosomal vacuoles, which are characteristic of Batten’s Disease.(22)
However, advances in genetic and biochemical understanding of Batten’s Disease have enabled use of DNA tests for common disease alleles, allowing for less invasive and more efficient methods of diagnosis. Approximately 80% of affected individuals worldwide are homozygotes for the 1.02-kb CLN3 mutation, and nearly all of the remaining 20% are compound heterozygotes for the 1.02-kb deletion and another missense or nonsense disease-causing mutation. This can be tested for fairly rapidly, with use of a single primer extension-based DNA “minisequencing” test to detect the 1.02 kb deletion. Detection of other less common mutation variants requires nucleotide sequencing. DNA sampling can be obtained from a buccal swab.(22)
Brain imaging of patients with Batten’s Disease may show variable cerebral and cerebellar atrophy, typically apparent after the age of 10 years, as well as bilateral mild optic nerve and tract atrophy in the absence of cortical involvement. Additionally, on T2-weighted images, the thalamus can appear with abnormally low signal intensity, and the periventricular white matter with abnormally high signal intensity.(23)
As previously mentioned, the ophthalmic manifestations (vision loss, night blindness, photophobia, and loss of peripheral and color vision) are commonly presenting symptoms of JNCL. A diagnostic workup is initiated based on patient presentation, however, aside from tests of gene sequencing, and electron and light microscopy, several other ophthalmic imaging modalities can be useful in confirming the diagnosis with characteristic findings. These modalities include: optical coherence tomography (OCT), fundus autofluorescence, electroretinogram (ERG), and brain imaging (CT or MRI).(23)
OCT can reveal reduced thickness in the central retina and outer and inner retinal layers. There can be observed homogeneous reflectivity in the inner retinal layer. Retinal pigment epithelium may contain hyperreflective granules. Additionally, the optical reflectivity of the inner retinal layers can appear abnormally homogenous. This morphology can be independent of the type of mutation causing the JNCL.(24) Fundus autofluorescence levels imaging shows a relatively dark fovea and normal or diffusely subnormal autofluorescence.(24)
At presentation, ERG can show a significant loss of amplitude at particularly under scotopic conditions. There is typically a greater and earlier-onset loss in b-wave amplitude compared to a-wave amplitude, resulting in a markedly reduced b:a ratio in the single flash photopic ERG. Such electronegative configuration with relative sparing of the a-wave indicates a primary lesion of the retina in the inner layers, and is in line with the inner retinal localization of the gene product for CLN3.(23)
Differentials include cone-rod dystrophy, inherited retinal dystrophy, metabolic diseases, and mitochondrial disease.
Currently, no treatment is known to halt or reverse the symptoms of Batten’s Disease. The only available therapies are symptomatic and targeted specifically at the psychiatric and neurologic manifestations of the disease.(22) Psychiatric manifestations can be managed with atypical antipsychotics as well as citalopram. Neurologic features such as seizures are treated fairly effectively with anticonvulsants such as valproic acid, carbamazepine, lamotrigine, and clonazepam; and movement disorders, such as spasticity, with baclofen and tizandine. Accompanying physical therapy, occupational therapy, speech therapy, feeding gastrostomy, suction and airway management provides further symptomatic support.(25)
In addition to symptomatic treatment, a combination of oral vitamin E and sodium selenite have been proven to have mild benefit to retarding the progression of Batten’s disease.(26) Polyunsaturated fatty acids have also been shown to reverse the lysosomal storage and accumulation in cultured lymphoblasts from JNCL patients(27), and further support the rationale for dietary supplementation in patients with this disease.
Though unclear whether autoimmunity is the disease cause or the consequence of the symptoms of Batten’s Disease, immune suppression using MMF has been shown to improve motor function in patients with CLN3 -/- Batten’ Disease, and reduce circulating autoantibodies directed toward brain antigens.(28)
The major barrier that exists to effectively treating Batten’s Disease is a necessity for central nervous system (CNS) access. A number of treatments are in various stages of development, though all face the challenge of crossing the blood-brain barrier to access the CNS. These treatments largely target defects in soluble lysosomal proteins and act via enzyme replacement, gene therapy, neural stem cell therapy, or small-molecule pharmaceuticals.(25) Greater understanding of the pathogenesis of Batten’s Disease will likely elucidate different targets along the disease cascade to establish future treatments.(29)
Batten's disease is characterised by early visual loss followed by progressive mental deterioration and fits and is invariably fatal, usually in the early 20s.
Resources for Batten Disease
- Centers of Excellence in the US
- Nationwide Children’s Hospital (Columbus, OH): 614-722-4629
- Debbie (assistant for Batten Disease Clinic): 614-722-4638
- Dr. Emily De Los Reyes (neurologist)
- Massachusetts General Hospital (Boston, MA): 617-726-5732
- University of Rochester Medical Center (Rochester, NY): 585-275-4762
- Texas Children’s Hospital (Houston, TX): 832-822-1759 or 832-822-1750
- Batten Disease Family Association (BFDA)
- Batten Disease Support and Research Association (BDSRA)
- National Institute of Neurological Disorders and Stroke: Batten Disease Fact Sheet
- NCL Resource – A Gateway for Batten Disease
- Children Living with Inherited Metabolic Diseases (CLIMB)
- Children’s Brain Disease Foundation
- National Tay-Sachs and Allied Diseases Association, Inc. (NTSAD)
- National Organization for Rare Disorders (NORD)
- Genetics Home Reference
- Foundation Fighting Blindness
- Clinical Trials
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