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Intellectual disability

Gene: ADAT3

Green List (high evidence)

ADAT3 (adenosine deaminase, tRNA specific 3)
EnsemblGeneIds (GRCh38): ENSG00000213638
EnsemblGeneIds (GRCh37): ENSG00000213638
OMIM: 615302, Gene2Phenotype
ADAT3 is in 3 panels

2 reviews

Louise Daugherty (Genomics England Curator)

Comment on list classification: New gene added by external expert and reviewed by curation team, enough evidence to support gene-disease association and relevance to this panel to rate this gene Green
Created: 20 Feb 2019, 4:38 p.m.

Konstantinos Varvagiannis (Other)

Green List (high evidence)

Initially reported in PMID 23620220, the findings in several individuals with biallelic ADAT3 pathogenic variants (including also those from the first report) are summarized in PMID 26842963.

A total of 39 individuals from 19 consanguineous families are described in the two studies. These individuals were homozygous for a specific missense variant (probably a Saudi Arabian founder mutation).

The common phenotype consists of intellectual disability (39/39 patients) and strabismus (32/39). Additional features included failure to thrive (33/39), microcephaly (22/39), short stature (11 of 15 individuals for whom this was information was available).

Epilepsy was observed in some of these individuals (6/39).

A few facial features were more common, although there was no distinct facial gestalt. //

PMID 30296593 reports on 2 additional subjects born to consanguineous parents and found to be homozygous for the same missense variant. These individuals presented with features similar to the previous reports (although none of them was reported to have seizures). //

Of note, the variant is either referred to as V144M (using NM_138422.2 or NM_138422.3) or as V128M (using NM_138422.1 as a reference / c.382G>A) as in the initial report. [ClinVar :] //

PMID 29796286 describes a 6-year-old female, born to consanguineous Iranian parents, investigated for developmental delay,intellectual disability, behavioral difficulties as well as microcephaly. A homozygous 8-basepair duplication in ADAT3 was identified by exome and was further confirmed by Sanger sequencing. This individual did not have seizures. //

This gene is included in DD/ID (but not epilepsy) panels offered by different diagnostic labs. //

As a result this gene can be considered for inclusion in the intellectual disability panel as green.
Sources: Expert Review, Literature
Created: 16 Oct 2018, 12:46 p.m.

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal



Variants in this GENE are reported as part of current diagnostic practice


Mode of Inheritance
BIALLELIC, autosomal or pseudoautosomal
  • Expert Review Green
  • Mental retardation, autosomal recessive 36, 615286
  • MRT36
Clinvar variants
Variants in ADAT3
Panels with this gene

History Filter Activity

20 Feb 2019, Gel status: 3

Entity classified by Genomics England curator

Louise Daugherty (Genomics England Curator)

Gene: adat3 has been classified as Green List (High Evidence).

20 Feb 2019, Gel status: 0

Set Phenotypes

Louise Daugherty (Genomics England Curator)

Phenotypes for gene: ADAT3 were changed from # 615286. MENTAL RETARDATION, AUTOSOMAL RECESSIVE 36; MRT36 to Mental retardation, autosomal recessive 36, 615286; MRT36

16 Oct 2018, Gel status: 0

Created, Added New Source, Set mode of inheritance, Set publications, Set Phenotypes, Set penetrance

Konstantinos Varvagiannis (Other)

gene: ADAT3 was added gene: ADAT3 was added to Intellectual disability. Sources: Expert Review,Literature Mode of inheritance for gene: ADAT3 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: ADAT3 were set to 23620220; 26842963; 30296593; 29796286 Phenotypes for gene: ADAT3 were set to # 615286. MENTAL RETARDATION, AUTOSOMAL RECESSIVE 36; MRT36 Penetrance for gene: ADAT3 were set to Complete Review for gene: ADAT3 was set to GREEN gene: ADAT3 was marked as current diagnostic