LMNB1-Related Autosomal Dominant Leukodystrophy

Clinical characteristics.

LMNB1-related autosomal dominant leukodystrophy (ADLD) is a slowly progressive disorder of central nervous system white matter characterized by onset of autonomic dysfunction in the fourth to fifth decade, followed by pyramidal and cerebellar abnormalities resulting in spasticity, ataxia, and tremor. Autonomic dysfunction can include bladder dysfunction, constipation, postural hypotension, erectile dysfunction, and (less often) impaired sweating. Pyramidal signs are often more prominent in the lower extremities (e.g., spastic weakness, hypertonia, clonus, brisk deep tendon reflexes, and bilateral Babinski signs). Cerebellar signs typically appear at the same time as the pyramidal signs and include gait ataxia, dysdiadochokinesia, intention tremor, dysmetria, and nystagmus. Many individuals have sensory deficits starting in the lower limbs. Pseudobulbar palsy with dysarthria, dysphagia, and forced crying and laughing may appear in the seventh or eighth decade. Although cognitive function is usually preserved or only mildly impaired early in the disease course, dementia and psychiatric manifestations can occur as late manifestations. Affected individuals may survive for decades after onset.

Diagnosis/testing.

The diagnosis of LMNB1-related ADLD is established in a proband with suggestive clinical and MRI findings and either an LMNB1 duplication or (more rarely) a heterozygous deletion upstream of the LMNB1 promoter identified by molecular genetic testing.

Management.

Treatment of manifestations: Treatment is symptomatic. For autonomic dysfunction:

• Neurogenic bladder may require management of urinary retention and/or urgency and recurrent urinary tract infection.
• Constipation may require good hydration, increased dietary fiber, stool softeners, and/or laxatives.
• Orthostatic hypotension can be minimized by pharmacologic intervention, compression stockings, physical therapy, and increased dietary salt.
• Erectile dysfunction is treated medically.
• Impaired sweating is managed with cool environment and attention to fever during infection.

Spasticity may be treated with medications and physical therapy. Ataxia can be managed with strategies to minimize falls and increase strength, and adaptive equipment such as walkers or wheelchairs. Feeding difficulties can be managed with speech therapy and appropriate feeding interventions to assure adequate nutrition while preventing aspiration pneumonia.

Surveillance: Routine assessment of: weight, nutrition, and feeding; pulmonary status (re possible recurrent pneumonia); bladder and erectile function; psychosocial well-being; and medications/doses to avoid iatrogenic polypharmacy. At least yearly assessment: by a neurologist for disease manifestations and progression; and by a physiatrist, orthopedist, physical therapist, and occupational therapist to address orthopedic, equipment, and functional needs.

Genetic counseling.

LMNB1-related ADLD is inherited in an autosomal dominant manner. To date, all individuals diagnosed with LMNB1-related ADLD whose parents have undergone molecular genetic testing have the disorder as the result of a large LMNB1 duplication (or a deletion upstream of LMNB1) inherited from an affected parent. Each child of an individual with LMNB1-related ADLD has a 50% chance of inheriting the LMNB1 duplication (or deletion upstream of LMNB1). Once the causative pathogenic variant has been identified in an affected family member, prenatal and preimplantation genetic testing for LMNB1-related ADLD are possible.

Suggestive Findings

LMNB1-related autosomal dominant leukodystrophy (ADLD) should be suspected in adults with the following clinical, neuroimaging, and family history findings:

Clinical features

• Onset in the fourth to fifth decade of signs and symptoms of autonomic dysfunction including bladder dysfunction, constipation, erectile dysfunction, and postural hypotension
• Subsequent onset of motor and cerebellar impairment resulting in spasticity, ataxia, and tremor

MRI findings. Brain and spinal cord MRI findings can precede clinical manifestations by decades.

Specific brain and spine MRI findings suggestive of LMNB1-related ADLD [Bergui et al 1997, Melberg et al 2006, Sundblom et al 2009, Finnsson et al 2015)] include the following:

• Symmetric T₂-weighted hyperintensities in the cerebral white matter extending from below the motor cortex, following corticospinal tracts downward through the posterior limb of the internal capsule toward the pyramids in the medulla oblongata. Over time, the signal abnormalities extend around the lateral ventricles from the frontal lobe to the parietal and occipital lobes and finally the temporal lobe to become completely confluent (Figure 1).
• Periventricular rims around the lateral ventricles are spared or mildly affected.
• Early involvement of the upper and middle cerebellar peduncles with marked T₂-weighted hyperintensity (Figure 1 A). The middle cerebellar peduncles may be spared in some individuals.
• Atrophy of the spinal cord is common, often with an increased T₂-weighted signal intensity in the entire spinal cord white matter (Figure 2).
• Brain atrophy may develop over time.
• No pathologic enhancement is seen after contrast medium administration.

Family history is consistent with autosomal dominant inheritance (e.g., affected males and females in multiple generations). Absence of a known family history does not preclude the diagnosis.

Establishing the Diagnosis

The diagnosis of LMNB1-related ADLD is established in a proband with suggestive clinical and MRI findings and either an LMNB1 duplication or (more rarely) a heterozygous deletion upstream of the LMNB1 promoter identified on molecular genetic testing [Giorgio et al 2015] (see Table 1).

Note: Identification of a heterozygous LMNB1 variant of uncertain significance does not establish or rule out the diagnosis of this disorder.

Molecular genetic testing approaches can include single-gene testing or the use of a multigene panel:

• Single-gene testing. Gene-targeted duplication/deletion analysis of LMNB1 (including the region upstream of the LMNB1 promoter) should be performed in individuals with classic clinical and neuroimaging features of LMNB1-related ADLD.
• A multigene panel that includes LMNB1 and other genes of interest (see Differential Diagnosis) is most likely to identify the genetic cause of the condition while limiting identification of variants of uncertain significance and pathogenic variants in genes that do not explain the underlying phenotype.
  Note: (1) Attention should be given to whether the panel includes duplication/deletion analysis, as sequence variants of LMNB1 are not known to be associated with LMNB1-related ADLD. (2) The genes included in the panel and the diagnostic sensitivity of the testing used for each gene vary by laboratory and are likely to change over time. (3) Some multigene panels may include genes not associated with the condition discussed in this GeneReview. (4) In some laboratories, panel options may include a custom laboratory-designed panel and/or custom phenotype-focused exome analysis that includes genes specified by the clinician. (5) Methods used in a panel may include sequence analysis, deletion/duplication analysis, and/or other non-sequencing-based tests.
  For an introduction to multigene panels click here. More detailed information for clinicians ordering genetic tests can be found here.

Comprehensive genomic testing including exome sequencing and genome sequencing is not recommended for LMNB1-related ADLD as this type of testing is not typically able to detect the duplication or upstream deletion of LMNB1 associated with this disorder.

Clinical Description

LMNB1-related autosomal dominant leukodystrophy (ADLD) is a slowly progressive neurologic disorder of central nervous system white matter. Adults show autonomic dysfunction, the first evidence of the disorder, in the fourth to fifth decade of life, followed by pyramidal and cerebellar abnormalities resulting in spasticity, ataxia, and tremor [Finnsson et al 2015].

To date, at least 33 families have been identified with a pathogenic variant in LMNB1 [Eldridge et al 1984, Quattrocolo et al 1997, Coffeen et al 2000, Marklund et al 2006, Padiath et al 2006, Meijer et al 2008, Brussino et al 2009, Schuster et al 2011, Dos Santos et al 2012, Molloy et al 2012, Potic et al 2013, Dai et al 2017, Sandoval-Rodríguez et al 2017, Mezaki et al 2018, Zhang et al 2019]. The following description of the phenotypic features associated with this condition is based on these reports.

Autonomic dysfunction, a nearly universal feature [Padiath & Fu 2010], includes bladder dysfunction, constipation, postural hypotension, erectile dysfunction, and (less often) impaired sweating. Symptoms of autonomic dysfunction may be the initial disease presentation and can precede the motor and cerebellar manifestations by months to years.

• Neurogenic bladder is commonly complicated by urinary urgency and/or incomplete bladder emptying, which is often complicated by urinary tract infection.
• Orthostatic hypotension can be asymptomatic or symptomatic (frequent fainting results in significant functional disability) [Finnsson et al 2015].
• Temperature dysregulation and heat intolerance can be a common feature in individuals with LMNB1-related ADLD [Finnsson et al 2015]. In rare cases hypothermia can be severe and life threatening [Meijer et al 2008]. Infection may exacerbate temperature instability; for example, body temperature decreased to 29.5° C in one individual with pneumonia [Finnsson et al 2015].
• It has been hypothesized that spinal cord white matter involvement [Finnsson et al 2015] and isolated noradrenergic failure [Guaraldi et al 2011] result in the autonomic dysfunction seen in this disorder.

Pyramidal signs and symptoms usually develop after manifestations of autonomic dysfunction; however, gait difficulties have been reported as the first manifestations [Finnsson et al 2015]. Pyramidal manifestations include signs of upper motor neuron dysfunction, often more prominent in the lower extremities (e.g., spastic weakness, hypertonia, clonus, brisk deep tendon reflexes, and bilateral Babinski signs). Spasticity can cause muscle pain and joint contractures. Over time, pyramidal dysfunction extends to the upper extremities.

Cerebellar signs that typically appear at the same time as the pyramidal signs include gait ataxia, dysdiadochokinesia, intention tremor, dysmetria, and nystagmus. Upper extremity postural tremor accompanied by neck tremor (resulting in head titubation) or jaw tremor (affecting speech and chewing) can also be seen [Schwankhaus et al 1988].

Cognitive function is usually preserved or mildly impaired early in the disease course; however, dementia and psychiatric manifestations can occur as late manifestations [Dos Santos et al 2012, Finnsson et al 2015].

Additional features

• Pseudobulbar palsy with dysarthria, dysphagia, and forced crying and laughing [Quattrocolo et al 1997] may appear in the eighth or eighth decade, which can affect feeding and lead to aspiration pneumonia and/or malnutrition.
• Many individuals have sensory deficits starting in the lower limbs associated with loss of position and vibration sensation attributed to extensive involvement of the spinal cord.
• Sensorineural hearing loss is seen in rare cases [Schwankhaus et al 1994].

Neurophysiologic studies are normal (electromyogram, visual evoked potentials, nerve conduction studies) or demonstrate nonspecific findings (brain stem auditory evoked potentials, somatosensory evoked potentials) or both (electroencephalograms).

Laboratory findings (CSF analysis, measurements of catecholamines, peripheral nerve biopsy) are either normal or do not yield findings specific to this disorder.

Prognosis. Affected individuals may survive for decades after onset of symptoms. Motor manifestations are usually slowly progressive without acute exacerbations; however, some affected individuals report reversible worsening of cognitive function and gait with fever [Finnsson et al 2015].

Genotype-Phenotype Correlations

Differences in clinical findings and MRI features have been noted between individuals with LMNB1 duplications and those with deletions upstream of LMNB1. Those with the upstream deletions have been found to have earlier age of onset and a lack of early dysautonomia, with less brain stem and cerebellar involvement and spinal cord narrowing [Mezaki et al 2018, Nmezi et al 2019].

Penetrance

The disease presents in the fourth to fifth decade of adulthood, with equal frequency in males and females. Penetrance is not known but is thought to be 100%.

Nomenclature

LMNB1-related ADLD was originally referred to as "autosomal dominant leukodystrophy mimicking chronic progressive multiple sclerosis" or "adult-onset leukodystrophy simulating chronic progressive multiple sclerosis" [Eldridge et al 1984, Schwankhaus et al 1994]. In later publications, the disorder has been called "adult-onset autosomal dominant leukodystrophy with autonomic symptoms" [Melberg et al 2006] or referred to only as "autosomal dominant leukodystrophy" (ADLD) without any further definition.

Prevalence

The exact prevalence of LMNB1-related ADLD is unknown. Published reports include 33 families with more than 70 affected individuals; it is likely that many more unpublished families have now been identified.

Families of European, Middle Eastern, Asian, and Mexican ancestry have been reported.

Acquired Demyelinating Disorders

Multiple sclerosis (MS) is an inflammatory disease that affects central nervous system white matter. The age of presentation and combination of motor, cerebellar, and autonomic manifestations make this disorder in some instances similar to LMNB1-related ADLD [Eldridge et al 1984]. Unlike the brain MRI in LMNB1-related ADLD, the brain MRI in MS is characterized by multifocal lesions mainly around the periventricular area, brain stem, cerebellum, and spinal cord [Noseworthy et al 2000]. CSF contains high IgG and oligoclonal bands [Poser et al 1983]. Available data suggest that multiple sclerosis is inherited as a complex multifactorial disorder that results from the interaction of genetic and environmental factors.

Vitamin B₁₂ deficiency. While the first manifestation of vitamin B₁₂ deficiency is typically megaloblastic anemia, on occasion the first manifestations can be the neurologic findings of subacute combined degeneration involving the spinal cord (myelopathy, loss of position and vibration sensation, bladder incontinence, and gait ataxia), peripheral nerves, and brain (neuropsychiatric disturbance). These neurologic findings can be confused with those of LMNB1-related ADLD. In vitamin B₁₂ deficiency, MRI may reveal T₂-weighted hyperintensities in the spinal cord; these are mainly cervical and localized, not diffuse as in LMNB1-related ADLD.

Because untreated vitamin B₁₂ deficiency is associated with progressive neurologic deterioration and because early detection and treatment can improve the long-term outcome, it is important that vitamin B₁₂ deficiency be considered in the differential diagnosis of LMNB1-related ADLD [Rabhi et al 2011, Devalia et al 2014, Issac et al 2015].

Hereditary Disorders

Evaluations Following Initial Diagnosis

To establish the extent of disease and needs in an individual diagnosed with LMNB1-related ADLD, the evaluations summarized in Table 3 (if not performed as part of the evaluation that led to the diagnosis) are recommended.

Treatment of Manifestations

Surveillance

Recommended surveillance:

• Routine assessment of weight, nutrition, and feeding; pulmonary status (re possible recurrent pneumonia); bladder and erectile function; psychosocial well-being; and medications and dosage to avoid iatrogenic polypharmacy
• At least annual assessment by multidisciplinary specialists including a neurologist for disease manifestations and progression; and by a physiatrist, orthopedist, physical therapist, and occupational therapist to address orthopedic, equipment, and functional needs

Agents/Circumstances to Avoid

Because disease manifestations may be exacerbated with fever and infection, care should be taken to avoid whenever possible exposure to those with infections.

Evaluation of Relatives at Risk

See Genetic Counseling for issues related to testing of at-risk relatives for genetic counseling purposes.

Therapies Under Investigation

Search ClinicalTrials.gov in the US and EU Clinical Trials Register in Europe for access to information on clinical studies for a wide range of diseases and conditions. Note: There may not be clinical trials for this disorder.

Mode of Inheritance

LMNB1-related autosomal dominant leukodystrophy (ADLD) is inherited in an autosomal dominant manner.

Risk to Family Members

Parents of a proband

• To date, all individuals diagnosed with LMNB1-related ADLD whose parents have undergone molecular genetic testing have the disorder as the result of an LMNB1 duplication (or a deletion upstream of LMNB1) inherited from an affected parent.
• To date, a de novo LMNB1 duplication (or deletion upstream of LMNB1) has not been reported in a proband; however, it should be noted that not all affected individuals have parents available for testing.
• If the proband appears to be the only affected family member (i.e., a simplex case) and the proband’s parents are available for testing, molecular genetic testing is recommended for the parents to confirm their genetic status and to allow reliable recurrence risk counseling.
• If the pathogenic variant identified in the proband is not identified in either parent and parental identity testing has confirmed biological maternity and paternity, the following possibilities should be considered:
  • The proband has a de novo pathogenic variant.
  • The proband inherited a pathogenic variant from a parent with germline (or somatic and germline) mosaicism. Note: Testing of parental leukocyte DNA may not detect all instances of somatic mosaicism and will not detect a pathogenic variant that is present in the germ cells only.
• The family history of some individuals diagnosed with LMNB1-related ADLD may appear to be negative because of failure to recognize the disorder in family members, early death of the parent before the onset of symptoms, or late onset of the disorder in the affected parent. Therefore, an apparently negative family history cannot be confirmed unless appropriate clinical evaluation and/or molecular genetic testing has demonstrated that neither parent is heterozygous for the pathogenic variant identified in the proband.

Sibs of a proband. The risk to the sibs of the proband depends on the genetic status of the proband's parents:

• If a parent of the proband is affected and/or has an LMNB1 duplication (or deletion upstream of LMNB1) , the risk to the sibs of inheriting the pathogenic variant is 50%; clinical severity may vary within families.
• If the LMNB1 duplication (or deletion upstream of LMNB1) identified in the proband cannot be detected in the leukocyte DNA of either parent, the recurrence risk to sibs is estimated to be 1% because of the theoretic possibility of parental germline mosaicism [Rahbari et al 2016].
• If the parents are clinically unaffected but have not been tested for the pathogenic variant identified in the proband, sibs of the proband are still presumed to be at increased risk for LMNB1-related ADLD because of the possibility of age-related penetrance in a heterozygous parent or the theoretic possibility of parental germline mosaicism.

Offspring of a proband. Each child of an individual with LMNB1-related ADLD has a 50% chance of inheriting the LMNB1 duplication (or deletion upstream of LMNB1).

Other family members. The risk to other family members depends on the status of the proband's parents: if a parent is affected and/or has an LMNB1 duplication (or deletion upstream of LMNB1), his or her family members may be at risk.

Related Genetic Counseling Issues

MRI findings suggestive of leukodystrophy may be seen many years before clinical manifestation of disease. This should perhaps be communicated to relatives at risk, as many persons may undergo MRI of the brain and spinal cord for a variety of unrelated reasons.

Predictive testing (i.e., testing of asymptomatic at-risk individuals)

• Predictive testing for at-risk relatives is possible once the LMNB1 duplication (or deletion upstream of LMNB1) has been identified in an affected family member.
• Potential consequences of such testing (including but not limited to socioeconomic changes and the need for long-term follow up and evaluation arrangements for individuals with a positive test result) as well as the capabilities and limitations of predictive testing should be discussed in the context of formal genetic counseling prior to testing.

Predictive testing in minors (i.e., testing of asymptomatic at-risk individuals younger than age 18 years)

• For asymptomatic minors at risk for adult-onset conditions for which early treatment would have no beneficial effect on disease morbidity and mortality, predictive genetic testing is considered inappropriate, primarily because it negates the autonomy of the child with no compelling benefit. Further, concern exists regarding the potential unhealthy adverse effects that such information may have on family dynamics, the risk of discrimination and stigmatization in the future, and the anxiety that such information may cause.
• For more information, see the National Society of Genetic Counselors position statement on genetic testing of minors for adult-onset conditions and the American Academy of Pediatrics and American College of Medical Genetics and Genomics policy statement: ethical and policy issues in genetic testing and screening of children.

In a family with an established diagnosis of LMNB1-related ADLD, it is appropriate to consider testing of symptomatic individuals regardless of age.

Family planning

• The optimal time for determination of genetic risk and discussion of the availability of prenatal/preimplantation genetic testing is before pregnancy.
• It is appropriate to offer genetic counseling (including discussion of potential risks to offspring and reproductive options) to young adults who are affected or at risk.

Prenatal Testing and Preimplantation Genetic Testing

Once the causative pathogenic variant has been identified in an affected family member, prenatal and preimplantation genetic testing for LMNB1-related ADLD are possible.

Differences in perspective may exist among medical professionals and within families regarding the use of prenatal testing. While most centers would consider use of prenatal testing to be a personal decision, discussion of these issues may be helpful. For more information, see the National Society of Genetic Counselors position statement on prenatal testing for adult-onset conditions.

Molecular Pathogenesis

LMNB1 encodes lamin-B1, a member of the intermediate filament family of structural proteins and an integral component of the nuclear lamina. It not only provides structural integrity to the nucleus but also plays a role in essential cellular processes such as transcription, DNA replication, DNA repair, and epigenetic regulation [Butin-Israeli et al 2012, Stancheva & Schirmer 2014]. Lamin-B1 is widely expressed in various cell types and shows high levels of expression in the brain [Jung et al 2013].

Both duplications of LMNB1 and deletions affecting the promoter upstream of LMNB1 are thought to result in increased levels of lamin-B1 and, as such, there is no abnormal gene product, just an overexpression of the wild type protein. In individuals with LMNB1-related adult-onset autosomal dominant leukodystrophy (ADLD):

• Fibroblasts have exhibited nuclear abnormalities, increased nuclear stiffness, and alterations in RNA splicing [Ferrera et al 2014, Bartoletti-Stella et al 2015].
• Overexpression in muscle cells had an effect on actin and sarcomere function [Columbaro et al 2013].
• Overexpression of lamin-B1 reduces the ability of astrocytes to support oligodendrocytes during the myelination process [Ratti et al 2021].

Overexpression of lamin-B1 was found to have deleterious effects in model organisms.

• Fruit fly model. Overexpression of lamin-B1 resulted in lethality and a degenerative phenotype [Padiath et al 2006].
• ADLD mouse model. Targeted overexpression of lamin-B1 in oligodendrocytes, but not in neurons or astrocytes, resulted in demyelination and an age-dependent motor dysfunction reminiscent of the human disease [Heng et al 2013].
• Mouse model. Overexpression of lamin-B1 caused age-dependent motor dysfunction, but not autonomic cardiovascular dysfunction, indicating that oligodendrocyte dysfunction alone may not be the underlying cause for the entire phenotypic spectrum of ADLD [Lo Martire et al 2018].
• Independently derived oligodendrocyte-specific lamin-B1 overexpressing mouse model. Vacuolar demyelination of the spinal cord linked to an age-dependent reduction in lipid synthesis was responsible for the degenerative phenotype [Rolyan et al 2015].

Mechanism of disease causation. The pathology in LMNB1-related ADLD is thought to be due to gain of abnormal function associated with increased levels of lamin-B1.

Author Notes

Raili Raininko
Professor of Neuroradiology (emerita), Uppsala University, Uppsala, Sweden
Email: raili.raininko@radiol.uu.se

Dr Raininko has ceased participation in clinical neuroradiologic work but continues in research projects. One of the main research areas is inherited neurologic diseases in children and adults. Disease development and mechanism have been investigated in collaboration with clinicians, geneticists, and pathologists.

Michael Gosky
Genetic Counselor, University of Kentucky
Email: mdg75@pitt.edu.

Mr Gosky recently completed his Masters degree in genetic counseling at the University of Pittsburgh and is currently a genetic counselor at the University of Kentucky. His research interests include neuroscience and genetics.

Quasar Padiath
Associate professor of Human Genetics and Neurobiology, University of Pittsburgh
Web page: www.publichealth.pitt.edu/home/directory/quasar-padiath
Email: qpadiath@pitt.edu

The major focus of the Padiath lab is to understand the molecular mechanisms underlying various neurologic diseases with an emphasis on the disorders of myelin known as leukodystrophies. This work involves the use of clinical-based family studies to identify disease-related genes and the development of animal and cell culture models to elucidate disease mechanisms. Dr Padiath identified lamin B1 duplications as the cause of ADLD; understanding the molecular mechanisms of this disease remains an important area of research in his lab at the University of Pittsburgh.

Acknowledgments

This work was supported by NIH grants R33NS106087, R01NS095884 and R21NS104384 to QSP. The authors would also like to acknowledge the support and participation of ADLD patients and family members, without which none of this work would be possible.

Author History

Michael Gosky, BS, MS (2021-present)
Norah Nahhas, MD; Children's National Health System (2016-2021)
Quasar S Padiath, MBBS, PhD (2016-present)
Raili Raininko, MD, PhD (2021-present)
Parisa Sadet Rasekh, MD, Children's National Health System (2016-2021)
Adeline Vanderver, MD; Children's Hospital of Philadelphia (2016-2021)

Revision History

• 15 July 2021 (ha) Comprehensive update posted live
• 7 January 2016 (me) Review posted live
• 27 August 2015 (nn) Original submission

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