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Hypomyelinating leukodystrophy 12(HLD12)

MedGen UID:
905068
Concept ID:
C4225247
Disease or Syndrome
Synonyms: HLD12; LEUKODYSTROPHY, HYPOMYELINATING, 12
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): VPS11 (11q23.3)
 
Monarch Initiative: MONDO:0014732
OMIM®: 616683
Orphanet: ORPHA466934

Definition

Hypomyelinating leukodystrophy-12 (HLD12) is an autosomal recessive neurologic disorder characterized by severely delayed or even lack of psychomotor development that becomes apparent in the first months of life. Patients are markedly disabled, with acquired microcephaly, lack of speech, and often lack of spontaneous movement due to hypotonia and spasticity. Brain imaging shows delayed myelination (summary by Edvardson et al., 2015). For a general phenotypic description and a discussion of genetic heterogeneity of HLD, see 312080. In a review of the pathogenesis of disorders with prominent dystonia or opisthotonic posturing as a feature, Monfrini et al. (2021) classified HLD12 as belonging to a group of neurologic disorders termed 'HOPS-associated neurologic disorders (HOPSANDs), which are caused by mutations in genes encoding various components of the autophagic/endolysosomal system, including VPS11. [from OMIM]

Clinical features

From HPO
Neurogenic bladder
MedGen UID:
595
Concept ID:
C0005697
Disease or Syndrome
A type of bladder dysfunction caused by neurologic damage. Neurogenic bladder can be flaccid or spastic. Common manifestatios of neurogenic bladder are overflow incontinence, frequency, urgency, urge incontinence, and retention.
Constipation
MedGen UID:
1101
Concept ID:
C0009806
Sign or Symptom
Infrequent or difficult evacuation of feces.
Hearing impairment
MedGen UID:
235586
Concept ID:
C1384666
Disease or Syndrome
A decreased magnitude of the sensory perception of sound.
Abnormal autonomic nervous system physiology
MedGen UID:
8511
Concept ID:
C0013363
Disease or Syndrome
A functional abnormality of the autonomic nervous system.
Spasticity
MedGen UID:
7753
Concept ID:
C0026838
Sign or Symptom
A motor disorder characterized by a velocity-dependent increase in tonic stretch reflexes with increased muscle tone, exaggerated (hyperexcitable) tendon reflexes.
Focal impaired awareness seizure
MedGen UID:
543022
Concept ID:
C0270834
Disease or Syndrome
Focal impaired awareness seizure (or focal seizure with impaired or lost awareness) is a type of focal-onset seizure characterized by some degree (which may be partial) of impairment of the person's awareness of themselves or their surroundings at any point during the seizure.
Hypoplasia of the corpus callosum
MedGen UID:
138005
Concept ID:
C0344482
Congenital Abnormality
Underdevelopment of the corpus callosum.
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.
Cerebellar atrophy
MedGen UID:
196624
Concept ID:
C0740279
Disease or Syndrome
Cerebellar atrophy is defined as a cerebellum with initially normal structures, in a posterior fossa with normal size, which displays enlarged fissures (interfolial spaces) in comparison to the foliae secondary to loss of tissue. Cerebellar atrophy implies irreversible loss of tissue and result from an ongoing progressive disease until a final stage is reached or a single injury, e.g. an intoxication or infectious event.
Delayed myelination
MedGen UID:
224820
Concept ID:
C1277241
Finding
Delayed myelination.
Severe global developmental delay
MedGen UID:
332436
Concept ID:
C1837397
Finding
A severe delay in the achievement of motor or mental milestones in the domains of development of a child.
Poor speech
MedGen UID:
341172
Concept ID:
C1848207
Finding
Developmental stagnation
MedGen UID:
341348
Concept ID:
C1848980
Finding
A cessation of the development of a child in the areas of motor skills, speech and language, cognitive skills, and social and/or emotional skills.
Absent speech
MedGen UID:
340737
Concept ID:
C1854882
Finding
Complete lack of development of speech and language abilities.
Cerebral hypomyelination
MedGen UID:
383084
Concept ID:
C2677328
Finding
Reduced amount of myelin in the nervous system resulting from defective myelinogenesis in the white matter of the central nervous system.
Ventriculomegaly
MedGen UID:
480553
Concept ID:
C3278923
Finding
An increase in size of the ventricular system of the brain.
Intellectual disability
MedGen UID:
811461
Concept ID:
C3714756
Mental or Behavioral Dysfunction
Intellectual disability, previously referred to as mental retardation, is characterized by subnormal intellectual functioning that occurs during the developmental period. It is defined by an IQ score below 70.
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.
Flexion contracture
MedGen UID:
83069
Concept ID:
C0333068
Anatomical Abnormality
A flexion contracture is a bent (flexed) joint that cannot be straightened actively or passively. It is thus a chronic loss of joint motion due to structural changes in muscle, tendons, ligaments, or skin that prevents normal movement of joints.
Secondary microcephaly
MedGen UID:
608952
Concept ID:
C0431352
Finding
Head circumference which falls below 2 standard deviations below the mean for age and gender because of insufficient head growth after birth.
Axial hypotonia
MedGen UID:
342959
Concept ID:
C1853743
Finding
Muscular hypotonia (abnormally low muscle tone) affecting the musculature of the trunk.
Microcephaly
MedGen UID:
1644158
Concept ID:
C4551563
Finding
Head circumference below 2 standard deviations below the mean for age and gender.
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.
Optic atrophy
MedGen UID:
18180
Concept ID:
C0029124
Disease or Syndrome
Atrophy of the optic nerve. Optic atrophy results from the death of the retinal ganglion cell axons that comprise the optic nerve and manifesting as a pale optic nerve on fundoscopy.
Reduced visual acuity
MedGen UID:
65889
Concept ID:
C0234632
Finding
Diminished clarity of vision.
Cerebral visual impairment
MedGen UID:
890568
Concept ID:
C4048268
Pathologic Function
A form of loss of vision caused by damage to the visual cortex rather than a defect in the eye.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVHypomyelinating leukodystrophy 12

Recent clinical studies

Etiology

Salter CG, Cai Y, Lo B, Helman G, Taylor H, McCartney A, Leslie JS, Accogli A, Zara F, Traverso M, Fasham J, Lees JA, Ferla MP, Chioza BA, Wenger O, Scott E, Cross HE, Crawford J, Warshawsky I, Keisling M, Agamanolis D, Ward Melver C, Cox H, Elawad M, Marton T, Wakeling MN, Holzinger D, Tippelt S, Munteanu M, Valcheva D, Deal C, Van Meerbeke S, Walsh Vockley C, Butte MJ, Acar U, van der Knaap MS, Korenke GC, Kotzaeridou U, Balla T, Simons C, Uhlig HH, Crosby AH, De Camilli P, Wolf NI, Baple EL
Brain 2021 Dec 31;144(12):3597-3610. doi: 10.1093/brain/awab313. PMID: 34415310Free PMC Article
Sarret C
Rev Neurol (Paris) 2020 Jan-Feb;176(1-2):10-19. Epub 2019 Jun 4 doi: 10.1016/j.neurol.2019.04.003. PMID: 31174885
Harting I, Karch S, Moog U, Seitz A, Pouwels PJW, Wolf NI
AJNR Am J Neuroradiol 2019 May;40(5):903-907. Epub 2019 May 2 doi: 10.3174/ajnr.A6051. PMID: 31048294Free PMC Article
Simons C, Dyment D, Bent SJ, Crawford J, D'Hooghe M, Kohlschütter A, Venkateswaran S, Helman G, Poll-The BT, Makowski CC, Ito Y, Kernohan K, Hartley T, Waisfisz Q, Taft RJ; Care4Rare Consortium, van der Knaap MS, Wolf NI
Brain 2017 Dec 1;140(12):3105-3111. doi: 10.1093/brain/awx314. PMID: 29186371Free PMC Article
Tonduti D, Aiello C, Renaldo F, Dorboz I, Saaman S, Rodriguez D, Fettah H, Elmaleh M, Biancheri R, Barresi S, Boccone L, Orcesi S, Pichiecchio A, Zangaglia R, Maurey H, Rossi A, Boespflug-Tanguy O, Bertini E
Eur J Paediatr Neurol 2016 Mar;20(2):323-330. Epub 2015 Nov 28 doi: 10.1016/j.ejpn.2015.11.006. PMID: 26643067

Diagnosis

Moore KM, Wolf NI, Hobson G, Bowyer K, McSherry J, Hartin G, Wilde C, Shapiro S, Frank J, Manley D, Junge C
J Child Neurol 2023 Feb;38(1-2):78-84. Epub 2023 Feb 6 doi: 10.1177/08830738231152658. PMID: 36744386
Sarret C
Rev Neurol (Paris) 2020 Jan-Feb;176(1-2):10-19. Epub 2019 Jun 4 doi: 10.1016/j.neurol.2019.04.003. PMID: 31174885
Cayami FK, Bugiani M, Pouwels PJW, Bernard G, van der Knaap MS, Wolf NI
Neuropediatrics 2018 Apr;49(2):112-117. Epub 2017 Nov 27 doi: 10.1055/s-0037-1608780. PMID: 29179231
Tonduti D, Aiello C, Renaldo F, Dorboz I, Saaman S, Rodriguez D, Fettah H, Elmaleh M, Biancheri R, Barresi S, Boccone L, Orcesi S, Pichiecchio A, Zangaglia R, Maurey H, Rossi A, Boespflug-Tanguy O, Bertini E
Eur J Paediatr Neurol 2016 Mar;20(2):323-330. Epub 2015 Nov 28 doi: 10.1016/j.ejpn.2015.11.006. PMID: 26643067
Hobson GM, Garbern JY
Semin Neurol 2012 Feb;32(1):62-7. Epub 2012 Mar 15 doi: 10.1055/s-0032-1306388. PMID: 22422208

Therapy

Yamamoto A, Shimizu-Motohashi Y, Ishiyama A, Kurosawa K, Sasaki M, Sato N, Osaka H, Takanashi JI, Inoue K
Pediatr Neurol 2024 Feb;151:80-83. Epub 2023 Dec 1 doi: 10.1016/j.pediatrneurol.2023.11.014. PMID: 38134864
Tonduti D, Aiello C, Renaldo F, Dorboz I, Saaman S, Rodriguez D, Fettah H, Elmaleh M, Biancheri R, Barresi S, Boccone L, Orcesi S, Pichiecchio A, Zangaglia R, Maurey H, Rossi A, Boespflug-Tanguy O, Bertini E
Eur J Paediatr Neurol 2016 Mar;20(2):323-330. Epub 2015 Nov 28 doi: 10.1016/j.ejpn.2015.11.006. PMID: 26643067

Prognosis

Hülsmeier AJ, Toelle SP, Bellstedt P, Wentzel C, Bahr A, Kolokotronis K, Hornemann T
J Lipid Res 2023 Dec;64(12):100464. Epub 2023 Oct 27 doi: 10.1016/j.jlr.2023.100464. PMID: 37890668Free PMC Article
Llaci L, Ramsey K, Belnap N, Claasen AM, Balak CD, Szelinger S, Jepsen WM, Siniard AL, Richholt R, Izat T, Naymik M, De Both M, Piras IS, Craig DW, Huentelman MJ, Narayanan V, Schrauwen I, Rangasamy S
Hum Genet 2019 Dec;138(11-12):1409-1417. Epub 2019 Nov 20 doi: 10.1007/s00439-019-02077-7. PMID: 31748968
Remerand G, Boespflug-Tanguy O, Tonduti D, Touraine R, Rodriguez D, Curie A, Perreton N, Des Portes V, Sarret C; RMLX/AHDS Study Group
Dev Med Child Neurol 2019 Dec;61(12):1439-1447. Epub 2019 Aug 13 doi: 10.1111/dmcn.14332. PMID: 31410843
Miyake N, Wolf NI, Cayami FK, Crawford J, Bley A, Bulas D, Conant A, Bent SJ, Gripp KW, Hahn A, Humphray S, Kimura-Ohba S, Kingsbury Z, Lajoie BR, Lal D, Micha D, Pizzino A, Sinke RJ, Sival D, Stolte-Dijkstra I, Superti-Furga A, Ulrick N, Taft RJ, Ogata T, Ozono K, Matsumoto N, Neubauer BA, Simons C, Vanderver A
Neurogenetics 2017 Dec;18(4):185-194. Epub 2017 Aug 26 doi: 10.1007/s10048-017-0520-x. PMID: 28842795Free PMC Article
Zaki MS, Bhat G, Sultan T, Issa M, Jung HJ, Dikoglu E, Selim L, G Mahmoud I, Abdel-Hamid MS, Abdel-Salam G, Marin-Valencia I, Gleeson JG
Ann Neurol 2016 Jul;80(1):59-70. Epub 2016 Jun 1 doi: 10.1002/ana.24678. PMID: 27130255Free PMC Article

Clinical prediction guides

Hülsmeier AJ, Toelle SP, Bellstedt P, Wentzel C, Bahr A, Kolokotronis K, Hornemann T
J Lipid Res 2023 Dec;64(12):100464. Epub 2023 Oct 27 doi: 10.1016/j.jlr.2023.100464. PMID: 37890668Free PMC Article
Choquet K, Pinard M, Yang S, Moir RD, Poitras C, Dicaire MJ, Sgarioto N, Larivière R, Kleinman CL, Willis IM, Gauthier MS, Coulombe B, Brais B
Mol Brain 2019 Jun 20;12(1):59. doi: 10.1186/s13041-019-0479-7. PMID: 31221184Free PMC Article
Miyake N, Wolf NI, Cayami FK, Crawford J, Bley A, Bulas D, Conant A, Bent SJ, Gripp KW, Hahn A, Humphray S, Kimura-Ohba S, Kingsbury Z, Lajoie BR, Lal D, Micha D, Pizzino A, Sinke RJ, Sival D, Stolte-Dijkstra I, Superti-Furga A, Ulrick N, Taft RJ, Ogata T, Ozono K, Matsumoto N, Neubauer BA, Simons C, Vanderver A
Neurogenetics 2017 Dec;18(4):185-194. Epub 2017 Aug 26 doi: 10.1007/s10048-017-0520-x. PMID: 28842795Free PMC Article
Zaki MS, Bhat G, Sultan T, Issa M, Jung HJ, Dikoglu E, Selim L, G Mahmoud I, Abdel-Hamid MS, Abdel-Salam G, Marin-Valencia I, Gleeson JG
Ann Neurol 2016 Jul;80(1):59-70. Epub 2016 Jun 1 doi: 10.1002/ana.24678. PMID: 27130255Free PMC Article
Tonduti D, Aiello C, Renaldo F, Dorboz I, Saaman S, Rodriguez D, Fettah H, Elmaleh M, Biancheri R, Barresi S, Boccone L, Orcesi S, Pichiecchio A, Zangaglia R, Maurey H, Rossi A, Boespflug-Tanguy O, Bertini E
Eur J Paediatr Neurol 2016 Mar;20(2):323-330. Epub 2015 Nov 28 doi: 10.1016/j.ejpn.2015.11.006. PMID: 26643067

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