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Intellectual disability, autosomal recessive 18(MRT18)

MedGen UID:
481895
Concept ID:
C3280265
Mental or Behavioral Dysfunction
Synonyms: INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL RECESSIVE 18, WITH OR WITHOUT EPILEPSY; MRT18
 
Gene (location): MED23 (6q23.2)
 
Monarch Initiative: MONDO:0013651
OMIM®: 614249

Definition

MRT18 is an autosomal recessive disorder characterized by impaired intellectual development with or without epilepsy. Other features may include spasticity, congenital heart disease, brain abnormalities, and atypical electroencephalography (summary by Trehan et al., 2015). [from OMIM]

Clinical features

From HPO
Atrial septal defect
MedGen UID:
6753
Concept ID:
C0018817
Congenital Abnormality
Atrial septal defect (ASD) is a congenital abnormality of the interatrial septum that enables blood flow between the left and right atria via the interatrial septum.
Ventricular septal defect
MedGen UID:
42366
Concept ID:
C0018818
Congenital Abnormality
A hole between the two bottom chambers (ventricles) of the heart. The defect is centered around the most superior aspect of the ventricular septum.
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.
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.
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.
Sleep abnormality
MedGen UID:
52372
Concept ID:
C0037317
Sign or Symptom
An abnormal pattern in the quality, quantity, or characteristics of sleep.
Choreoathetosis
MedGen UID:
39313
Concept ID:
C0085583
Disease or Syndrome
Involuntary movements characterized by both athetosis (inability to sustain muscles in a fixed position) and chorea (widespread jerky arrhythmic movements).
Expressive language delay
MedGen UID:
141568
Concept ID:
C0454641
Disease or Syndrome
A delay in the acquisition of the ability to use language to communicate needs, wishes, or thoughts.
Hypoplasia of the pons
MedGen UID:
341246
Concept ID:
C1848529
Finding
Underdevelopment of the pons.
Irritability
MedGen UID:
397841
Concept ID:
C2700617
Mental Process
A proneness to anger, i.e., a tendency to become easily bothered or annoyed.
Intellectual disability, profound
MedGen UID:
892508
Concept ID:
C3161330
Mental or Behavioral Dysfunction
Profound mental retardation is defined as an intelligence quotient (IQ) below 20.
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.
Thin corpus callosum
MedGen UID:
1785336
Concept ID:
C5441562
Anatomical Abnormality
An abnormally thin corpus callous, due to atrophy, hypoplasia or agenesis. This term is intended to be used in situations where it is not known if thinning of the corpus callosum (for instance, as visualized by magnetic resonance tomography) is due to abnormal development (e.g. a leukodystrophy) or atrophy following normal development (e.g. neurodegeneration).
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.

Professional guidelines

PubMed

Xie MJ, Cromie GA, Owens K, Timour MS, Tang M, Kutz JN, El-Hattab AW, McLaughlin RN Jr, Dudley AM
PLoS Genet 2023 Oct;19(10):e1010972. Epub 2023 Oct 9 doi: 10.1371/journal.pgen.1010972. PMID: 37812589Free PMC Article
Prasad A, Sdano MA, Vanzo RJ, Mowery-Rushton PA, Serrano MA, Hensel CH, Wassman ER
BMC Med Genet 2018 Mar 20;19(1):46. doi: 10.1186/s12881-018-0555-3. PMID: 29554876Free PMC Article
Moser AE, Singh I, Brown FR 3rd, Solish GI, Kelley RI, Benke PJ, Moser HW
N Engl J Med 1984 May 3;310(18):1141-6. doi: 10.1056/NEJM198405033101802. PMID: 6709009

Recent clinical studies

Etiology

Zhang Y, Peng C, Wang L, Chen S, Wang J, Tian Z, Wang C, Chen X, Zhu S, Zhang GF, Wang Y
Orphanet J Rare Dis 2023 Sep 9;18(1):281. doi: 10.1186/s13023-023-02898-w. PMID: 37689673Free PMC Article
Tong S, Ventola P, Frater CH, Klotz J, Phillips JM, Muppidi S, Dwight SS, Mueller WF, Beahm BJ, Wilsey M, Lee KJ
Hum Mol Genet 2023 Sep 5;32(18):2787-2796. doi: 10.1093/hmg/ddad106. PMID: 37379343Free PMC Article
Ilyas M, Efthymiou S, Salpietro V, Noureen N, Zafar F, Rauf S, Mir A, Houlden H
BMC Med Genet 2020 Mar 24;21(1):59. doi: 10.1186/s12881-020-00998-z. PMID: 32209057Free PMC Article
Pekeles H, Accogli A, Boudrahem-Addour N, Russell L, Parente F, Srour M
Pediatr Neurol 2019 Mar;92:32-36. Epub 2018 Nov 22 doi: 10.1016/j.pediatrneurol.2018.11.005. PMID: 30581057
Ebrahimi-Fakhari D
Neuropediatrics 2018 Feb;49(1):18-25. Epub 2017 Nov 7 doi: 10.1055/s-0037-1608652. PMID: 29112993

Diagnosis

Zhang Y, Peng C, Wang L, Chen S, Wang J, Tian Z, Wang C, Chen X, Zhu S, Zhang GF, Wang Y
Orphanet J Rare Dis 2023 Sep 9;18(1):281. doi: 10.1186/s13023-023-02898-w. PMID: 37689673Free PMC Article
Maroofian R, Kaiyrzhanov R, Cali E, Zamani M, Zaki MS, Ferla M, Tortora D, Sadeghian S, Saadi SM, Abdullah U, Karimiani EG, Efthymiou S, Yeşil G, Alavi S, Al Shamsi AM, Tajsharghi H, Abdel-Hamid MS, Saadi NW, Al Mutairi F, Alabdi L, Beetz C, Ali Z, Toosi MB, Rudnik-Schöneborn S, Babaei M, Isohanni P, Muhammad J, Khan S, Al Shalan M, Hickey SE, Marom D, Elhanan E, Kurian MA, Marafi D, Saberi A, Hamid M, Spaull R, Meng L, Lalani S, Maqbool S, Rahman F, Seeger J, Palculict TB, Lau T, Murphy D, Mencacci NE, Steindl K, Begemann A, Rauch A, Akbas S, Aslanger AD, Salpietro V, Yousaf H, Ben-Shachar S, Ejeskär K, Al Aqeel AI, High FA, Armstrong-Javors AE, Zahraei SM, Seifi T, Zeighami J, Shariati G, Sedaghat A, Asl SN, Shahrooei M, Zifarelli G, Burglen L, Ravelli C, Zschocke J, Schatz UA, Ghavideldarestani M, Kamel WA, Van Esch H, Hackenberg A, Taylor JC, Al-Gazali L, Bauer P, Gleeson JJ, Alkuraya FS, Lupski JR, Galehdari H, Azizimalamiri R, Chung WK, Baig SM, Houlden H, Severino M
Brain 2023 Dec 1;146(12):5031-5043. doi: 10.1093/brain/awad257. PMID: 37517035Free PMC Article
Saffari A, Kellner M, Jordan C, Rosengarten H, Mo A, Zhang B, Strelko O, Neuser S, Davis MY, Yoshikura N, Futamura N, Takeuchi T, Nabatame S, Ishiura H, Tsuji S, Aldeen HS, Cali E, Rocca C, Houlden H, Efthymiou S, Assmann B, Yoon G, Trombetta BA, Kivisäkk P, Eichler F, Nan H, Takiyama Y, Tessa A, Santorelli FM, Sahin M, Blackstone C, Yang E, Schüle R, Ebrahimi-Fakhari D
Brain 2023 May 2;146(5):2003-2015. doi: 10.1093/brain/awac391. PMID: 36315648Free PMC Article
Pekeles H, Accogli A, Boudrahem-Addour N, Russell L, Parente F, Srour M
Pediatr Neurol 2019 Mar;92:32-36. Epub 2018 Nov 22 doi: 10.1016/j.pediatrneurol.2018.11.005. PMID: 30581057
Cheung SW, Bi W
Expert Rev Mol Diagn 2018 Jun;18(6):531-542. Epub 2018 May 31 doi: 10.1080/14737159.2018.1479253. PMID: 29848116

Therapy

Saffari A, Kellner M, Jordan C, Rosengarten H, Mo A, Zhang B, Strelko O, Neuser S, Davis MY, Yoshikura N, Futamura N, Takeuchi T, Nabatame S, Ishiura H, Tsuji S, Aldeen HS, Cali E, Rocca C, Houlden H, Efthymiou S, Assmann B, Yoon G, Trombetta BA, Kivisäkk P, Eichler F, Nan H, Takiyama Y, Tessa A, Santorelli FM, Sahin M, Blackstone C, Yang E, Schüle R, Ebrahimi-Fakhari D
Brain 2023 May 2;146(5):2003-2015. doi: 10.1093/brain/awac391. PMID: 36315648Free PMC Article
Shields LBE, Peppas DS, Rosenberg E
BMC Pediatr 2018 Jul 12;18(1):231. doi: 10.1186/s12887-018-1197-5. PMID: 30001695Free PMC Article
Mercimek-Mahmutoglu S, Salomons GS, Chan A
Pediatr Neurol 2014 Jul;51(1):133-7. Epub 2014 Feb 21 doi: 10.1016/j.pediatrneurol.2014.02.011. PMID: 24766785
Darrigo LG Jr, Rodrigues MC, Pieroni F, Stracieri AB, Moraes DA, Grecco CE, Dias JB, Sobral AC, Simões BP
Pediatr Transplant 2014 May;18(3):E93-5. Epub 2014 Feb 1 doi: 10.1111/petr.12230. PMID: 24483323
Bosley TM, Salih MA, Alorainy IA, Islam MZ, Oystreck DT, Suliman OS, al Malki S, Suhaibani AH, Khiari H, Beckers S, van Wesenbeeck L, Perdu B, AlDrees A, Elmalik SA, Van Hul W, Abu-Amero KK
Brain 2011 Dec;134(Pt 12):3502-15. Epub 2011 Nov 26 doi: 10.1093/brain/awr302. PMID: 22120147

Prognosis

Zhang Y, Peng C, Wang L, Chen S, Wang J, Tian Z, Wang C, Chen X, Zhu S, Zhang GF, Wang Y
Orphanet J Rare Dis 2023 Sep 9;18(1):281. doi: 10.1186/s13023-023-02898-w. PMID: 37689673Free PMC Article
Tong S, Ventola P, Frater CH, Klotz J, Phillips JM, Muppidi S, Dwight SS, Mueller WF, Beahm BJ, Wilsey M, Lee KJ
Hum Mol Genet 2023 Sep 5;32(18):2787-2796. doi: 10.1093/hmg/ddad106. PMID: 37379343Free PMC Article
Bohlega S, Abusrair AH, Al-Ajlan FS, Alharbi N, Al-Semari A, Bohlega B, Abualsaud D, Alkuraya F
Parkinsonism Relat Disord 2019 Dec;69:99-103. Epub 2019 Oct 13 doi: 10.1016/j.parkreldis.2019.10.007. PMID: 31726291
Donoghue SE, Pitt JJ, Boneh A, White SM
J Pediatr Endocrinol Metab 2018 Mar 28;31(4):451-459. doi: 10.1515/jpem-2017-0501. PMID: 29455191
Salih MA, Tzschach A, Oystreck DT, Hassan HH, AlDrees A, Elmalik SA, El Khashab HY, Wienker TF, Abu-Amero KK, Bosley TM
Am J Med Genet A 2013 Jun;161A(6):1207-13. Epub 2013 Apr 30 doi: 10.1002/ajmg.a.35850. PMID: 23633300

Clinical prediction guides

Maroofian R, Kaiyrzhanov R, Cali E, Zamani M, Zaki MS, Ferla M, Tortora D, Sadeghian S, Saadi SM, Abdullah U, Karimiani EG, Efthymiou S, Yeşil G, Alavi S, Al Shamsi AM, Tajsharghi H, Abdel-Hamid MS, Saadi NW, Al Mutairi F, Alabdi L, Beetz C, Ali Z, Toosi MB, Rudnik-Schöneborn S, Babaei M, Isohanni P, Muhammad J, Khan S, Al Shalan M, Hickey SE, Marom D, Elhanan E, Kurian MA, Marafi D, Saberi A, Hamid M, Spaull R, Meng L, Lalani S, Maqbool S, Rahman F, Seeger J, Palculict TB, Lau T, Murphy D, Mencacci NE, Steindl K, Begemann A, Rauch A, Akbas S, Aslanger AD, Salpietro V, Yousaf H, Ben-Shachar S, Ejeskär K, Al Aqeel AI, High FA, Armstrong-Javors AE, Zahraei SM, Seifi T, Zeighami J, Shariati G, Sedaghat A, Asl SN, Shahrooei M, Zifarelli G, Burglen L, Ravelli C, Zschocke J, Schatz UA, Ghavideldarestani M, Kamel WA, Van Esch H, Hackenberg A, Taylor JC, Al-Gazali L, Bauer P, Gleeson JJ, Alkuraya FS, Lupski JR, Galehdari H, Azizimalamiri R, Chung WK, Baig SM, Houlden H, Severino M
Brain 2023 Dec 1;146(12):5031-5043. doi: 10.1093/brain/awad257. PMID: 37517035Free PMC Article
Tong S, Ventola P, Frater CH, Klotz J, Phillips JM, Muppidi S, Dwight SS, Mueller WF, Beahm BJ, Wilsey M, Lee KJ
Hum Mol Genet 2023 Sep 5;32(18):2787-2796. doi: 10.1093/hmg/ddad106. PMID: 37379343Free PMC Article
Saffari A, Kellner M, Jordan C, Rosengarten H, Mo A, Zhang B, Strelko O, Neuser S, Davis MY, Yoshikura N, Futamura N, Takeuchi T, Nabatame S, Ishiura H, Tsuji S, Aldeen HS, Cali E, Rocca C, Houlden H, Efthymiou S, Assmann B, Yoon G, Trombetta BA, Kivisäkk P, Eichler F, Nan H, Takiyama Y, Tessa A, Santorelli FM, Sahin M, Blackstone C, Yang E, Schüle R, Ebrahimi-Fakhari D
Brain 2023 May 2;146(5):2003-2015. doi: 10.1093/brain/awac391. PMID: 36315648Free PMC Article
Dolgin V, Straussberg R, Xu R, Mileva I, Yogev Y, Khoury R, Konen O, Barhum Y, Zvulunov A, Mao C, Birk OS
Eur J Hum Genet 2019 Nov;27(11):1668-1676. Epub 2019 Jun 11 doi: 10.1038/s41431-019-0444-z. PMID: 31186544Free PMC Article
Willemsen MA, IJlst L, Steijlen PM, Rotteveel JJ, de Jong JG, van Domburg PH, Mayatepek E, Gabreëls FJ, Wanders RJ
Brain 2001 Jul;124(Pt 7):1426-37. doi: 10.1093/brain/124.7.1426. PMID: 11408337

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