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Brain dopamine-serotonin vesicular transport disease(PKDYS2)

MedGen UID:
929215
Concept ID:
C4303546
Disease or Syndrome
Synonyms: BRAIN MONOAMINE VESICULAR TRANSPORT DISEASE; PARKINSONISM-DYSTONIA 2, INFANTILE-ONSET; Parkinsonism-dystonia, infantile, 2; PKDYS2
SNOMED CT: Brain dopamine-serotonin vesicular transport disease (717942003)
Modes of inheritance:
Autosomal recessive inheritance
MedGen UID:
141025
Concept ID:
C0441748
Intellectual Product
Source: Orphanet
A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in individuals with two pathogenic alleles, either homozygotes (two copies of the same mutant allele) or compound heterozygotes (whereby each copy of a gene has a distinct mutant allele).
 
Gene (location): SLC18A2 (10q25.3)
 
Monarch Initiative: MONDO:0018130
OMIM®: 618049
Orphanet: ORPHA352649

Definition

An infantile-onset neurometabolic disease with characteristics of dystonia, parkinsonism, nonambulation, autonomic dysfunction, developmental delay and mood disturbances. The prevalence is unknown. It has been described in 8 patients from one Saudi Arabian family to date. Caused by a mutation in the SLC18A2 gene (10q25), encoding the vesicular monoamine transporter 2 (VMAT2) which is responsible for the transport of dopamine and serotonin into synaptic vesicles. Mutations in this gene lead to the impairment of VMAT2 and consequently to problems with motor control, autonomic functioning and mood regulation. It is inherited in an autosomal recessive manner. [from SNOMEDCT_US]

Clinical features

From HPO
Fatigue
MedGen UID:
41971
Concept ID:
C0015672
Sign or Symptom
A subjective feeling of tiredness characterized by a lack of energy and motivation.
Elevated urinary homovanillic acid
MedGen UID:
866486
Concept ID:
C4020736
Finding
An increased concentration of homovanillic acid in the urine.
Decreased urinary dopamine level
MedGen UID:
1864070
Concept ID:
C5937479
Finding
The concentration of dopamine in the urine, normalized for urine concentration, is below the lower limit of normal.
Elevated urinary 5-hydroxyindoleacetic acid level
MedGen UID:
1864386
Concept ID:
C5937484
Finding
The amount of 5-hydroxyindoleacetic acid (5-HIAA) in the urine, normalized for urine concentration, is above the upper limit of normal.
Cerebellar ataxia
MedGen UID:
849
Concept ID:
C0007758
Disease or Syndrome
Cerebellar ataxia refers to ataxia due to dysfunction of the cerebellum. This causes a variety of elementary neurological deficits including asynergy (lack of coordination between muscles, limbs and joints), dysmetria (lack of ability to judge distances that can lead to under- or overshoot in grasping movements), and dysdiadochokinesia (inability to perform rapid movements requiring antagonizing muscle groups to be switched on and off repeatedly).
Dysarthria
MedGen UID:
8510
Concept ID:
C0013362
Mental or Behavioral Dysfunction
Dysarthric speech is a general description referring to a neurological speech disorder characterized by poor articulation. Depending on the involved neurological structures, dysarthria may be further classified as spastic, flaccid, ataxic, hyperkinetic and hypokinetic, or mixed.
Abnormal autonomic nervous system physiology
MedGen UID:
8511
Concept ID:
C0013363
Disease or Syndrome
A functional abnormality of the autonomic nervous system.
Dystonic disorder
MedGen UID:
3940
Concept ID:
C0013421
Sign or Symptom
An abnormally increased muscular tone that causes fixed abnormal postures. There is a slow, intermittent twisting motion that leads to exaggerated turning and posture of the extremities and trunk.
Intellectual disability, mild
MedGen UID:
10044
Concept ID:
C0026106
Mental or Behavioral Dysfunction
Mild intellectual disability is defined as an intelligence quotient (IQ) in the range of 50-69.
Sleep abnormality
MedGen UID:
52372
Concept ID:
C0037317
Finding
An abnormal pattern in the quality, quantity, or characteristics of sleep.
Tremor
MedGen UID:
21635
Concept ID:
C0040822
Sign or Symptom
An unintentional, oscillating to-and-fro muscle movement about a joint axis.
Oculogyric crisis
MedGen UID:
43221
Concept ID:
C0085637
Pathologic Function
An acute dystonic reaction with blepharospasm, periorbital twitches, and protracted fixed staring episodes. There may be a maximal upward deviation of the eyes in the sustained fashion. Oculogyric crisis can be triggered by a number of factors including neuroleptic medications.
Hyperreflexia
MedGen UID:
57738
Concept ID:
C0151889
Finding
Hyperreflexia is the presence of hyperactive stretch reflexes of the muscles.
Shuffling gait
MedGen UID:
68545
Concept ID:
C0231688
Finding
A type of gait (walking) characterized by by dragging one's feet along or without lifting the feet fully from the ground.
Dysdiadochokinesis
MedGen UID:
115975
Concept ID:
C0234979
Sign or Symptom
A type of ataxia characterized by the impairment of the ability to perform rapidly alternating movements, such as pronating and supinating his or her hand on the dorsum of the other hand as rapidly as possible.
Delayed ability to walk
MedGen UID:
66034
Concept ID:
C0241726
Finding
A failure to achieve the ability to walk at an appropriate developmental stage. Most children learn to walk in a series of stages, and learn to walk short distances independently between 12 and 15 months.
Parkinsonian disorder
MedGen UID:
66079
Concept ID:
C0242422
Disease or Syndrome
Characteristic neurologic anomaly resulting from degeneration of dopamine-generating cells in the substantia nigra, a region of the midbrain, characterized clinically by shaking, rigidity, slowness of movement and difficulty with walking and gait.
Incoordination
MedGen UID:
141714
Concept ID:
C0520966
Finding
Global developmental delay
MedGen UID:
107838
Concept ID:
C0557874
Finding
A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age.
Delayed ability to sit
MedGen UID:
1368737
Concept ID:
C4476710
Finding
A failure to achieve the ability to sit at an appropriate developmental stage. Most children sit with support at 6 months of age and sit steadily without support at 9 months of age.
Stooped posture
MedGen UID:
1393424
Concept ID:
C4476759
Finding
A habitual positioning of the body with the head and upper back bent forward.
Hypotonia
MedGen UID:
10133
Concept ID:
C0026827
Finding
Hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle). Even when relaxed, muscles have a continuous and passive partial contraction which provides some resistance to passive stretching. Hypotonia thus manifests as diminished resistance to passive stretching. Hypotonia is not the same as muscle weakness, although the two conditions can co-exist.
Poor head control
MedGen UID:
322809
Concept ID:
C1836038
Finding
Difficulty to maintain correct position of the head while standing or sitting. Infant head lag is observed when the head seems to flop around or lags posteriorly behind the trunk. Several articles have maintained that head lag should be absent by age 3 to 4 months.
Axial hypotonia
MedGen UID:
342959
Concept ID:
C1853743
Finding
Muscular hypotonia (abnormally low muscle tone) affecting the musculature of the trunk.
Temperature instability
MedGen UID:
329973
Concept ID:
C1820737
Finding
Disordered thermoregulation characterized by an impaired ability to maintain a balance between heat production and heat loss, with resulting instability of body temperature.
Hypernasal speech
MedGen UID:
99115
Concept ID:
C0454555
Finding
A type of speech characterized by the presence of an abnormally increased nasal airflow during speech associated with structural abnormality of the nasal passages.
Hypomimic face
MedGen UID:
208827
Concept ID:
C0813217
Finding
A reduced degree of motion of the muscles beneath the skin of the face, often associated with reduced facial crease formation.
Hyperhidrosis
MedGen UID:
5690
Concept ID:
C0020458
Finding
Abnormal excessive perspiration (sweating) despite the lack of appropriate stimuli like hot and humid weather.
Ptosis
MedGen UID:
2287
Concept ID:
C0005745
Disease or Syndrome
The upper eyelid margin is positioned 3 mm or more lower than usual and covers the superior portion of the iris (objective); or, the upper lid margin obscures at least part of the pupil (subjective).

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  

Professional guidelines

PubMed

Rilstone JJ, Alkhater RA, Minassian BA
N Engl J Med 2013 Feb 7;368(6):543-50. Epub 2013 Jan 30 doi: 10.1056/NEJMoa1207281. PMID: 23363473

Recent clinical studies

Etiology

Zhai H, Zheng Y, He Y, Zhang Y, Guo Z, Cui W, Sun L
Int J Neurosci 2023 May;133(5):574-577. Epub 2021 Jun 24 doi: 10.1080/00207454.2021.1938036. PMID: 34078222

Diagnosis

Zhai H, Zheng Y, He Y, Zhang Y, Guo Z, Cui W, Sun L
Int J Neurosci 2023 May;133(5):574-577. Epub 2021 Jun 24 doi: 10.1080/00207454.2021.1938036. PMID: 34078222

Therapy

Jacobsen JC, Wilson C, Cunningham V, Glamuzina E, Prosser DO, Love DR, Burgess T, Taylor J, Swan B, Hill R, Robertson SP, Snell RG, Lehnert K
J Inherit Metab Dis 2016 Mar;39(2):305-8. Epub 2015 Oct 26 doi: 10.1007/s10545-015-9897-6. PMID: 26497564
Rilstone JJ, Alkhater RA, Minassian BA
N Engl J Med 2013 Feb 7;368(6):543-50. Epub 2013 Jan 30 doi: 10.1056/NEJMoa1207281. PMID: 23363473

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