ADCADN

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This entry is adapted from the peer-reviewed paper https://medlineplus.gov/genetics/condition/autosomal-dominant-cerebellar-ataxia-deafness-and-narcolepsy

Autosomal dominant cerebellar ataxia, deafness, and narcolepsy (ADCADN) is a nervous system disorder with signs and symptoms that usually begin in mid-adulthood and gradually get worse.

genetic conditions

1. Introduction

People with ADCADN have difficulty coordinating movements (ataxia) and mild to moderate hearing loss caused by abnormalities of the inner ear (sensorineural deafness). Most have excessive daytime sleepiness (narcolepsy). Narcolepsy is typically accompanied by cataplexy, which is a sudden brief loss of muscle tone in response to strong emotion (such as excitement, surprise, or anger). These episodes of muscle weakness can cause an affected person to slump over or fall, which occasionally leads to injury. These characteristic signs and symptoms of ADCADN typically begin in a person's thirties.

Eventually, people with ADCADN also experience a decline of intellectual function (dementia). The cognitive problems often begin with impairment of executive function, which is the ability to plan and implement actions and develop problem-solving strategies. Other features that can occur as the condition worsens include degeneration of the nerves that carry information from the eyes to the brain (optic atrophy); clouding of the lenses of the eyes (cataracts); numbness, tingling, or pain in the arms and legs (sensory neuropathy); puffiness or swelling (lymphedema) of the limbs; an inability to control the bowels or the flow of urine (incontinence); depression; uncontrollable crying or laughing (pseudobulbar signs); or a distorted view of reality (psychosis). Affected individuals usually survive into their forties or fifties.

2. Frequency

The prevalence of ADCADN is unknown. At least 24 affected individuals have been described in the medical literature.

3. Causes

ADCADN is caused by mutations in the DNMT1 gene, which provides instructions for making an enzyme called DNA methyltransferase 1. This enzyme is involved in DNA methylation, which is the addition of methyl groups, consisting of one carbon atom and three hydrogen atoms, to DNA molecules. In particular, the enzyme helps add methyl groups to DNA building blocks (nucleotides) called cytosines.

DNA methyltransferase 1 is active in the adult nervous system. Although its specific role in the nervous system is not well understood, the enzyme may help regulate nerve cell (neuron) maturation and specialization (differentiation), the ability of neurons to move (migrate) where needed and connect with each other, and neuron survival.

DNMT1 gene mutations that cause ADCADN affect a region of the DNA methyltransferase 1 enzyme that helps target the methylation process to the correct segments of DNA. As a result of these mutations, methylation is abnormal, which affects the expression of multiple genes. Maintenance of the neurons that make up the nervous system is disrupted, leading to the signs and symptoms of ADCADN.

4. Inheritance

This condition is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder.

In most cases, an affected person inherits the mutation from one affected parent. Other cases result from new mutations in the gene and occur in people with no history of the disorder in their family.

5. Other Names for This Condition

ADCA-DN syndrome
ADCADN
autosomal dominant cerebellar ataxia-deafness-narcolepsy syndrome
cerebellar ataxia, deafness, and narcolepsy, autosomal dominant

References

Baets J, Duan X, Wu Y, Smith G, Seeley WW, Mademan I, McGrath NM, Beadell NC, Khoury J, Botuyan MV, Mer G, Worrell GA, Hojo K, DeLeon J, Laura M, Liu YT,Senderek J, Weis J, Van den Bergh P, Merrill SL, Reilly MM, Houlden H, GrossmanM, Scherer SS, De Jonghe P, Dyck PJ, Klein CJ. Defects of mutant DNMT1 are linkedto a spectrum of neurological disorders. Brain. 2015 Apr;138(Pt 4):845-61. doi:10.1093/brain/awv010.
Kernohan KD, Cigana Schenkel L, Huang L, Smith A, Pare G, Ainsworth P;Care4Rare Canada Consortium, Boycott KM, Warman-Chardon J, Sadikovic B.Identification of a methylation profile for DNMT1-associated autosomal dominantcerebellar ataxia, deafness, and narcolepsy. Clin Epigenetics. 2016 Sep 5;8:91.doi: 10.1186/s13148-016-0254-x.
Moghadam KK, Pizza F, La Morgia C, Franceschini C, Tonon C, Lodi R, Barboni P,Seri M, Ferrari S, Liguori R, Donadio V, Parchi P, Cornelio F, Inzitari D,Mignarri A, Capocchi G, Dotti MT, Winkelmann J, Lin L, Mignot E, Carelli V,Plazzi G. Narcolepsy is a common phenotype in HSAN IE and ADCA-DN. Brain. 2014Jun;137(Pt 6):1643-55. doi: 10.1093/brain/awu069.
Walker LA, Bourque P, Smith AM, Warman Chardon J. Autosomal dominantcerebellar ataxia, deafness, and narcolepsy (ADCA-DN) associated with progressivecognitive and behavioral deterioration. Neuropsychology. 2017 Mar;31(3):292-303. doi: 10.1037/neu0000322.
Winkelmann J, Lin L, Schormair B, Kornum BR, Faraco J, Plazzi G, Melberg A,Cornelio F, Urban AE, Pizza F, Poli F, Grubert F, Wieland T, Graf E, Hallmayer J,Strom TM, Mignot E. Mutations in DNMT1 cause autosomal dominant cerebellarataxia, deafness and narcolepsy. Hum Mol Genet. 2012 May 15;21(10):2205-10. doi: 10.1093/hmg/dds035.

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Peter Tang

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Table of Contents

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1. Introduction

2. Frequency

3. Causes

4. Inheritance

5. Other Names for This Condition

References

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1. Introduction

2. Frequency

3. Causes

3.1. The gene associated with Autosomal dominant cerebellar ataxia, deafness, and narcolepsy

4. Inheritance

5. Other Names for This Condition

References