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Intellectual developmental disorder, autosomal dominant 69(MRD69)

MedGen UID:
1808299
Concept ID:
C5676896
Mental or Behavioral Dysfunction
Synonyms: MENTAL RETARDATION, AUTOSOMAL DOMINANT 69; MRD69
 
Gene (location): LMAN2L (2q11.2)
 
Monarch Initiative: MONDO:0029465
OMIM®: 617863

Definition

Autosomal dominant intellectual developmental disorder-69 (MRD69) is characterized by developmental delay with variably impaired intellectual development. Additional features may include intention tremor in infancy and seizures in childhood, with remission of these in adolescence (Alkhater et al., 2019). [from OMIM]

Clinical features

From HPO
Delayed speech and language development
MedGen UID:
105318
Concept ID:
C0454644
Finding
A degree of language development that is significantly below the norm for a child of a specified age.
Bilateral tonic-clonic seizure
MedGen UID:
141670
Concept ID:
C0494475
Sign or Symptom
A bilateral tonic-clonic seizure is a seizure defined by a tonic (bilateral increased tone, lasting seconds to minutes) and then a clonic (bilateral sustained rhythmic jerking) phase.
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.
Attention deficit hyperactivity disorder
MedGen UID:
220387
Concept ID:
C1263846
Mental or Behavioral Dysfunction
Attention-deficit/hyperactivity disorder (ADHD) is a behavioral disorder that typically begins in childhood and is characterized by a short attention span (inattention), an inability to be calm and stay still (hyperactivity), and poor impulse control (impulsivity). Some people with ADHD have problems with only inattention or with hyperactivity and impulsivity, but most have problems related to all three features.\n\nIn people with ADHD, the characteristic behaviors are frequent and severe enough to interfere with the activities of daily living such as school, work, and relationships with others. Because of an inability to stay focused on tasks, people with inattention may be easily distracted, forgetful, avoid tasks that require sustained attention, have difficulty organizing tasks, or frequently lose items.\n\nHyperactivity is usually shown by frequent movement. Individuals with this feature often fidget or tap their foot when seated, leave their seat when it is inappropriate to do so (such as in the classroom), or talk a lot and interrupt others.\n\nImpulsivity can result in hasty actions without thought for the consequences. Individuals with poor impulse control may have difficulty waiting for their turn, deferring to others, or considering their actions before acting.\n\nMore than two-thirds of all individuals with ADHD have additional conditions, including insomnia, mood or anxiety disorders, learning disorders, or substance use disorders. Affected individuals may also have autism spectrum disorder, which is characterized by impaired communication and social interaction, or Tourette syndrome, which is a disorder characterized by repetitive and involuntary movements or noises called tics.\n\nIn most affected individuals, ADHD continues throughout life, but in about one-third of individuals, signs and symptoms of ADHD go away by adulthood.
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.
Intention tremor
MedGen UID:
1642960
Concept ID:
C4551520
Sign or Symptom
A type of kinetic tremor that occurs during target directed movement is called intention tremor. That is, an oscillatory cerebellar ataxia that tends to be absent when the limbs are inactive and during the first part of voluntary movement but worsening as the movement continues and greater precision is required (e.g., in touching a target such as the patient's nose or a physician's finger).

Professional guidelines

PubMed

Sheth H, Pancholi D, Bhavsar R, Mannan AU, Ganapathy A, Chowdhury M, Shah S, Solanki D, Sheth F, Sheth J
Neurol India 2021 Nov-Dec;69(6):1729-1736. doi: 10.4103/0028-3886.333475. PMID: 34979677

Recent clinical studies

Prognosis

van der Steld LP, Rocha MS, Ladeia AMT, Livramento HL, Campos GB, Darrieux FCDC, Campuzano O, Brugada R
Einstein (Sao Paulo) 2024;22:eAO0549. Epub 2024 Jul 26 doi: 10.31744/einstein_journal/2024AO0549. PMID: 39082507Free PMC Article
Ye XC, Roslin NM, Paterson AD, Lyons CJ, Pegado V, Richmond P, Shyr C, Fornes O, Han X, Higginson M, Ross CJ, Giaschi D, Gregory-Evans C, Patel MS, Wasserman WW
J Med Genet 2022 Jan;59(1):46-55. Epub 2020 Nov 30 doi: 10.1136/jmedgenet-2020-107226. PMID: 33257509Free PMC Article
Morlino S, Nardella G, Castellana S, Micale L, Copetti M, Fusco C, Castori M
Am J Med Genet A 2021 Mar;185(3):955-965. Epub 2020 Dec 27 doi: 10.1002/ajmg.a.62047. PMID: 33369135
Moog U, van Mierlo I, van Schrojenstein Lantman-de Valk HM, Spaapen L, Maaskant MA, Curfs LM
Am J Med Genet C Semin Med Genet 2007 Aug 15;145C(3):293-301. doi: 10.1002/ajmg.c.30142. PMID: 17640047

Clinical prediction guides

van der Steld LP, Rocha MS, Ladeia AMT, Livramento HL, Campos GB, Darrieux FCDC, Campuzano O, Brugada R
Einstein (Sao Paulo) 2024;22:eAO0549. Epub 2024 Jul 26 doi: 10.31744/einstein_journal/2024AO0549. PMID: 39082507Free PMC Article
Leduc F, Smol T, Catteau B, Boute O, Petit F
Eur J Med Genet 2024 Jun;69:104942. Epub 2024 Apr 25 doi: 10.1016/j.ejmg.2024.104942. PMID: 38677542
Ye XC, Roslin NM, Paterson AD, Lyons CJ, Pegado V, Richmond P, Shyr C, Fornes O, Han X, Higginson M, Ross CJ, Giaschi D, Gregory-Evans C, Patel MS, Wasserman WW
J Med Genet 2022 Jan;59(1):46-55. Epub 2020 Nov 30 doi: 10.1136/jmedgenet-2020-107226. PMID: 33257509Free PMC Article
Parenti I, Lehalle D, Nava C, Torti E, Leitão E, Person R, Mizuguchi T, Matsumoto N, Kato M, Nakamura K, de Man SA, Cope H, Shashi V; Undiagnosed Diseases Network, Friedman J, Joset P, Steindl K, Rauch A, Muffels I, van Hasselt PM, Petit F, Smol T, Le Guyader G, Bilan F, Sorlin A, Vitobello A, Philippe C, van de Laar IMBH, van Slegtenhorst MA, Campeau PM, Au PYB, Nakashima M, Saitsu H, Yamamoto T, Nomura Y, Louie RJ, Lyons MJ, Dobson A, Plomp AS, Motazacker MM, Kaiser FJ, Timberlake AT, Fuchs SA, Depienne C, Mignot C
Hum Genet 2021 Jul;140(7):1109-1120. Epub 2021 May 4 doi: 10.1007/s00439-021-02283-2. PMID: 33944996Free PMC Article
Morlino S, Nardella G, Castellana S, Micale L, Copetti M, Fusco C, Castori M
Am J Med Genet A 2021 Mar;185(3):955-965. Epub 2020 Dec 27 doi: 10.1002/ajmg.a.62047. PMID: 33369135

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