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Developmental and epileptic encephalopathy 92(IECEE2; DEE92)

MedGen UID:
1638319
Concept ID:
C4693362
Disease or Syndrome
Synonym: Epileptic encephalopathy, infantile or early childhood, 2
 
Gene (location): GABRB2 (5q34)
 
Monarch Initiative: MONDO:0020631
OMIM®: 617829

Definition

Developmental and epileptic encephalopathy-92 (DEE92) is characterized in most patients by onset of seizures in infancy or childhood and associated with global developmental delay and variable impairment of intellectual development. The seizure type and severity varies, and seizures may be intractable in some patients. Some patients are severely affected, unable to walk or speak, whereas others show some development. Additional neurologic features, including cortical blindness, dystonia, and spasticity, may occur. Mutations occur de novo (summary by Hamdan et al., 2017). For a discussion of genetic heterogeneity of DEE, see 308350. [from OMIM]

Clinical features

From HPO
Feeding difficulties
MedGen UID:
65429
Concept ID:
C0232466
Finding
Impaired ability to eat related to problems gathering food and getting ready to suck, chew, or swallow it.
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).
Dyskinesia
MedGen UID:
8514
Concept ID:
C0013384
Disease or Syndrome
A movement disorder which consists of effects including diminished voluntary movements and the presence of involuntary movements.
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.
Lethargy
MedGen UID:
7310
Concept ID:
C0023380
Sign or Symptom
A state of fatigue, either physical or mental slowness and sluggishness, with difficulties in initiating or performing simple tasks. Distinguished from apathy which implies indifference and a lack of desire or interest in the task. A person with lethargy may have the desire, but not the energy to engage in personal or socially relevant tasks.
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.
Myoclonus
MedGen UID:
10234
Concept ID:
C0027066
Finding
Very brief, involuntary random muscular contractions occurring at rest, in response to sensory stimuli, or accompanying voluntary movements.
Seizure
MedGen UID:
20693
Concept ID:
C0036572
Sign or Symptom
A seizure is an intermittent abnormality of nervous system physiology characterized by a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain.
EEG abnormality
MedGen UID:
56235
Concept ID:
C0151611
Finding
Abnormality observed by electroencephalogram (EEG), which is used to record of the brain's spontaneous electrical activity from multiple electrodes placed on the scalp.
Epileptic encephalopathy
MedGen UID:
452596
Concept ID:
C0543888
Disease or Syndrome
A condition in which epileptiform abnormalities are believed to contribute to the progressive disturbance in cerebral function. Epileptic encephalaopathy is characterized by (1) electrographic EEG paroxysmal activity that is often aggressive, (2) seizures that are usually multiform and intractable, (3) cognitive, behavioral and neurological deficits that may be relentless, and (4) sometimes early death.
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.
Inability to walk
MedGen UID:
107860
Concept ID:
C0560046
Finding
Incapability to ambulate.
Gait disturbance
MedGen UID:
107895
Concept ID:
C0575081
Finding
The term gait disturbance can refer to any disruption of the ability to walk.
Absent speech
MedGen UID:
340737
Concept ID:
C1854882
Finding
Complete lack of development of speech and language abilities.
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.
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.
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.

Professional guidelines

PubMed

Liu W, Cheng M, Zhu Y, Chen Y, Yang Y, Chen H, Niu X, Tian X, Yang X, Zhang Y
Dev Med Child Neurol 2023 Apr;65(4):534-543. Epub 2022 Sep 29 doi: 10.1111/dmcn.15414. PMID: 36175372
Pop-Jordanova N
Pril (Makedon Akad Nauk Umet Odd Med Nauki) 2019 May 1;40(1):5-40. doi: 10.2478/prilozi-2019-0001. PMID: 31152643
Strehlow V, Heyne HO, Vlaskamp DRM, Marwick KFM, Rudolf G, de Bellescize J, Biskup S, Brilstra EH, Brouwer OF, Callenbach PMC, Hentschel J, Hirsch E, Kind PC, Mignot C, Platzer K, Rump P, Skehel PA, Wyllie DJA, Hardingham GE, van Ravenswaaij-Arts CMA, Lesca G, Lemke JR; GRIN2A study group
Brain 2019 Jan 1;142(1):80-92. doi: 10.1093/brain/awy304. PMID: 30544257Free PMC Article

Recent clinical studies

Etiology

Beck VC, Isom LL, Berg AT
J Pediatr 2021 Oct;237:41-49.e1. Epub 2021 Jun 26 doi: 10.1016/j.jpeds.2021.06.034. PMID: 34181986Free PMC Article
Pop-Jordanova N
Pril (Makedon Akad Nauk Umet Odd Med Nauki) 2019 May 1;40(1):5-40. doi: 10.2478/prilozi-2019-0001. PMID: 31152643
Strehlow V, Heyne HO, Vlaskamp DRM, Marwick KFM, Rudolf G, de Bellescize J, Biskup S, Brilstra EH, Brouwer OF, Callenbach PMC, Hentschel J, Hirsch E, Kind PC, Mignot C, Platzer K, Rump P, Skehel PA, Wyllie DJA, Hardingham GE, van Ravenswaaij-Arts CMA, Lesca G, Lemke JR; GRIN2A study group
Brain 2019 Jan 1;142(1):80-92. doi: 10.1093/brain/awy304. PMID: 30544257Free PMC Article
Vlaskamp DRM, Shaw BJ, Burgess R, Mei D, Montomoli M, Xie H, Myers CT, Bennett MF, XiangWei W, Williams D, Maas SM, Brooks AS, Mancini GMS, van de Laar IMBH, van Hagen JM, Ware TL, Webster RI, Malone S, Berkovic SF, Kalnins RM, Sicca F, Korenke GC, van Ravenswaaij-Arts CMA, Hildebrand MS, Mefford HC, Jiang Y, Guerrini R, Scheffer IE
Neurology 2019 Jan 8;92(2):e96-e107. Epub 2018 Dec 12 doi: 10.1212/WNL.0000000000006729. PMID: 30541864Free PMC Article
Muhle R, Trentacoste SV, Rapin I
Pediatrics 2004 May;113(5):e472-86. doi: 10.1542/peds.113.5.e472. PMID: 15121991

Diagnosis

Sullivan J, Benítez A, Roth J, Andrews JS, Shah D, Butcher E, Jones A, Cross JH
Epilepsia 2024 May;65(5):1240-1263. Epub 2024 Jan 22 doi: 10.1111/epi.17866. PMID: 38252068
Liu W, Cheng M, Zhu Y, Chen Y, Yang Y, Chen H, Niu X, Tian X, Yang X, Zhang Y
Dev Med Child Neurol 2023 Apr;65(4):534-543. Epub 2022 Sep 29 doi: 10.1111/dmcn.15414. PMID: 36175372
Pop-Jordanova N
Pril (Makedon Akad Nauk Umet Odd Med Nauki) 2019 May 1;40(1):5-40. doi: 10.2478/prilozi-2019-0001. PMID: 31152643
Sands TT, McDonough TL
Curr Neurol Neurosci Rep 2016 Oct;16(10):92. doi: 10.1007/s11910-016-0694-x. PMID: 27595805
Muhle R, Trentacoste SV, Rapin I
Pediatrics 2004 May;113(5):e472-86. doi: 10.1542/peds.113.5.e472. PMID: 15121991

Therapy

Tzadok M, Gur-Pollack R, Florh H, Michaeli Y, Gilboa T, Lezinger M, Heyman E, Chernuha V, Gudis I, Nissenkorn A, Lerman-Sagie T, Ben Zeev B, Uliel-Sibony S
Pediatr Neurol 2024 Jan;150:91-96. Epub 2023 Oct 20 doi: 10.1016/j.pediatrneurol.2023.10.012. PMID: 37995414
Goel K, Phillips HW, Chen JS, Ngo J, Edmonds B, Ha PX, Wang A, Weil A, Russell BE, Salamon N, Nariai H, Fallah A
Epilepsia 2024 Jan;65(1):57-72. Epub 2023 Nov 11 doi: 10.1111/epi.17807. PMID: 37873610
Kuersten M, Tacke M, Gerstl L, Hoelz H, Stülpnagel CV, Borggraefe I
Eur J Med Genet 2020 Jan;63(1):103628. Epub 2019 Feb 14 doi: 10.1016/j.ejmg.2019.02.001. PMID: 30771507
Pop-Jordanova N
Pril (Makedon Akad Nauk Umet Odd Med Nauki) 2019 May 1;40(1):5-40. doi: 10.2478/prilozi-2019-0001. PMID: 31152643
Vlaskamp DRM, Shaw BJ, Burgess R, Mei D, Montomoli M, Xie H, Myers CT, Bennett MF, XiangWei W, Williams D, Maas SM, Brooks AS, Mancini GMS, van de Laar IMBH, van Hagen JM, Ware TL, Webster RI, Malone S, Berkovic SF, Kalnins RM, Sicca F, Korenke GC, van Ravenswaaij-Arts CMA, Hildebrand MS, Mefford HC, Jiang Y, Guerrini R, Scheffer IE
Neurology 2019 Jan 8;92(2):e96-e107. Epub 2018 Dec 12 doi: 10.1212/WNL.0000000000006729. PMID: 30541864Free PMC Article

Prognosis

Mohammadi NA, Ahring PK, Yu Liao VW, Chua HC, Ortiz de la Rosa S, Johannesen KM, Michaeli-Yossef Y, Vincent-Devulder A, Meridda C, Bruel AL, Rossi A, Patel C, Klepper J, Bonanni P, Minghetti S, Trivisano M, Specchio N, Amor D, Auvin S, Baer S, Meyer P, Milh M, Salpietro V, Maroofian R, Lemke JR, Weckhuysen S, Christophersen P, Rubboli G, Chebib M, Jensen AA, Absalom NL, Møller RS
EBioMedicine 2024 Aug;106:105236. Epub 2024 Jul 11 doi: 10.1016/j.ebiom.2024.105236. PMID: 38996765Free PMC Article
Sullivan J, Benítez A, Roth J, Andrews JS, Shah D, Butcher E, Jones A, Cross JH
Epilepsia 2024 May;65(5):1240-1263. Epub 2024 Jan 22 doi: 10.1111/epi.17866. PMID: 38252068
Goel K, Phillips HW, Chen JS, Ngo J, Edmonds B, Ha PX, Wang A, Weil A, Russell BE, Salamon N, Nariai H, Fallah A
Epilepsia 2024 Jan;65(1):57-72. Epub 2023 Nov 11 doi: 10.1111/epi.17807. PMID: 37873610
Pop-Jordanova N
Pril (Makedon Akad Nauk Umet Odd Med Nauki) 2019 May 1;40(1):5-40. doi: 10.2478/prilozi-2019-0001. PMID: 31152643
Strehlow V, Heyne HO, Vlaskamp DRM, Marwick KFM, Rudolf G, de Bellescize J, Biskup S, Brilstra EH, Brouwer OF, Callenbach PMC, Hentschel J, Hirsch E, Kind PC, Mignot C, Platzer K, Rump P, Skehel PA, Wyllie DJA, Hardingham GE, van Ravenswaaij-Arts CMA, Lesca G, Lemke JR; GRIN2A study group
Brain 2019 Jan 1;142(1):80-92. doi: 10.1093/brain/awy304. PMID: 30544257Free PMC Article

Clinical prediction guides

Mohammadi NA, Ahring PK, Yu Liao VW, Chua HC, Ortiz de la Rosa S, Johannesen KM, Michaeli-Yossef Y, Vincent-Devulder A, Meridda C, Bruel AL, Rossi A, Patel C, Klepper J, Bonanni P, Minghetti S, Trivisano M, Specchio N, Amor D, Auvin S, Baer S, Meyer P, Milh M, Salpietro V, Maroofian R, Lemke JR, Weckhuysen S, Christophersen P, Rubboli G, Chebib M, Jensen AA, Absalom NL, Møller RS
EBioMedicine 2024 Aug;106:105236. Epub 2024 Jul 11 doi: 10.1016/j.ebiom.2024.105236. PMID: 38996765Free PMC Article
Goel K, Phillips HW, Chen JS, Ngo J, Edmonds B, Ha PX, Wang A, Weil A, Russell BE, Salamon N, Nariai H, Fallah A
Epilepsia 2024 Jan;65(1):57-72. Epub 2023 Nov 11 doi: 10.1111/epi.17807. PMID: 37873610
Nagarajan B, Gowda VK, Yoganathan S, Sharawat IK, Srivastava K, Vora N, Badheka R, Danda S, Kalane U, Kaur A, Madaan P, Mehta S, Negi S, Panda PK, Rajadhyaksha S, Saini AG, Saini L, Shah S, Srinivasan VM, Suthar R, Thomas M, Vyas S, Sankhyan N, Sahu JK
Epilepsia Open 2023 Dec;8(4):1383-1404. Epub 2023 Aug 25 doi: 10.1002/epi4.12811. PMID: 37583270Free PMC Article
Pop-Jordanova N
Pril (Makedon Akad Nauk Umet Odd Med Nauki) 2019 May 1;40(1):5-40. doi: 10.2478/prilozi-2019-0001. PMID: 31152643
Strehlow V, Heyne HO, Vlaskamp DRM, Marwick KFM, Rudolf G, de Bellescize J, Biskup S, Brilstra EH, Brouwer OF, Callenbach PMC, Hentschel J, Hirsch E, Kind PC, Mignot C, Platzer K, Rump P, Skehel PA, Wyllie DJA, Hardingham GE, van Ravenswaaij-Arts CMA, Lesca G, Lemke JR; GRIN2A study group
Brain 2019 Jan 1;142(1):80-92. doi: 10.1093/brain/awy304. PMID: 30544257Free PMC Article

Recent systematic reviews

Sullivan J, Benítez A, Roth J, Andrews JS, Shah D, Butcher E, Jones A, Cross JH
Epilepsia 2024 May;65(5):1240-1263. Epub 2024 Jan 22 doi: 10.1111/epi.17866. PMID: 38252068
Schmidlechner T, Zaddach M, Heinen F, Cornell S, Ramantani G, Rémi J, Vollmar C, Kunz M, Borggraefe I
J Neurol 2024 Jan;271(1):177-187. Epub 2023 Sep 28 doi: 10.1007/s00415-023-12002-8. PMID: 37770569Free PMC Article
Sullivan AW, Johnson MK, Boes AD, Tranel D
Cortex 2023 Jun;163:92-122. Epub 2023 Mar 30 doi: 10.1016/j.cortex.2023.03.002. PMID: 37086580Free PMC Article
Kuersten M, Tacke M, Gerstl L, Hoelz H, Stülpnagel CV, Borggraefe I
Eur J Med Genet 2020 Jan;63(1):103628. Epub 2019 Feb 14 doi: 10.1016/j.ejmg.2019.02.001. PMID: 30771507
Nevalainen O, Ansakorpi H, Simola M, Raitanen J, Isojärvi J, Artama M, Auvinen A
Neurology 2014 Nov 18;83(21):1968-77. Epub 2014 Oct 22 doi: 10.1212/WNL.0000000000001005. PMID: 25339211

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