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Intellectual disability v8.220 TFG Sarah Leigh Classified gene: TFG as Amber List (moderate evidence)
Intellectual disability v8.220 TFG Sarah Leigh Gene: tfg has been classified as Amber List (Moderate Evidence).
Intellectual disability v8.219 TFG Sarah Leigh edited their review of gene: TFG: Added comment: Biallelic TFG variants have been associated with Spastic paraplegia 57, autosomal recessive (OMIM:615658). Five biallelic TFG variants have been associated with OMIM:615658 in nine families from various ethnicities (PMID: 23479643; 27601211; 27492651; 28124177; 29971521; 30467354; 33767317). A range of phenotypic features were reported (table 2 in PMID: 33767317), with spasticity apparent in 8/8 families examined and intellectual disability in 5/9 families.; Changed rating: GREEN
Intellectual disability v8.219 TFG Sarah Leigh Tag Q1_25_ promote_green tag was added to gene: TFG.
Intellectual disability v8.219 TFG Sarah Leigh Publications for gene: TFG were set to 23479643; 33767317
Intellectual disability v8.218 TFG Sarah Leigh Publications for gene: TFG were set to 33767317
Intellectual disability v8.217 TFG Sarah Leigh Added comment: Comment on publications: PMID: 33767317 was identified by the Genomics England Applied Machine Learning (ML) team in a Biocuration-ML project for identifying new gene-disease associations using Natural Language Processing (NLP) and Generative AI techniques.
Intellectual disability v8.217 TFG Sarah Leigh Publications for gene: TFG were set to 33767317
Intellectual disability v8.206 TFG Sarah Leigh Publications for gene: TFG were set to
Intellectual disability v3.1239 TFG Arina Puzriakova Phenotypes for gene: TFG were changed from Hereditary motor and sensory neuropathy, proximal type, 604484; ?Spastic paraplegia 57, autosomal recessive, 615658 to Spastic paraplegia 57, autosomal recessive, OMIM:615658
Intellectual disability v3.933 TFG Arina Puzriakova Source: Expert Review Amber was removed from gene: TFG
Intellectual disability v3.663 ITFG2 Arina Puzriakova Publications for gene: ITFG2 were set to 28397838; https://doi.org/10.1038/s41525-020-00150-z
Intellectual disability v3.662 ITFG2 Arina Puzriakova Classified gene: ITFG2 as Amber List (moderate evidence)
Intellectual disability v3.662 ITFG2 Arina Puzriakova Added comment: Comment on list classification: New gene added by Konstantinos Varvagiannis. Rating Amber as ITFG2 can only be classified as a possible candidate gene based present evidence. Clinical and pedigree details are limited and there is no supporting functional data. Additional cases required to corroborate this gene-disease association.
Intellectual disability v3.662 ITFG2 Arina Puzriakova Gene: itfg2 has been classified as Amber List (Moderate Evidence).
Intellectual disability v3.420 ITFG2 Konstantinos Varvagiannis gene: ITFG2 was added
gene: ITFG2 was added to Intellectual disability. Sources: Literature
Mode of inheritance for gene: ITFG2 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: ITFG2 were set to 28397838; https://doi.org/10.1038/s41525-020-00150-z
Phenotypes for gene: ITFG2 were set to Neurodevelopmental abnormality; Intellectual disability; Developmental regression; Ataxia
Penetrance for gene: ITFG2 were set to Complete
Review for gene: ITFG2 was set to AMBER
Added comment: ITFG2 was suggested to be a candidate gene for autosomal recessive ID in the study by Harripaul et al (2018 - PMID: 28397838). The authors performed microarray and exome sequencing in 192 consanguineous families and identified a homozygous ITGF2 stopgain variant (NM_018463.3:c.472G>T / p.Glu158*) along with 3 additional variants segregating with ID within an investigated family (PK51).

Cheema et al (2020 - https://doi.org/10.1038/s41525-020-00150-z) report briefly on a male, born to consanguineous parents presenting with NDD, seizures, regression and ataxia. There was a similarly affected female sibling. Evaluation of ROH revealed a homozygous ITFG2 nonsense variant [NM_018463.3:c.361C>T / p.(Gln121*)]. Families in this study were investigated by trio WES or WGS.

Evaluation of data of the same lab revealed 3 additional unrelated subjects with overlapping phenotypes, notably NDD and ataxia. These individuals were - each - homozygous for pLoF variants [NM_018463.3:c.848-1G>A; NM_018463.3:c.704dupC, p.(Ala236fs), NM_018463.3:c.1000_1001delAT, p.(Ile334fs)].

As discussed in OMIM, ITFG2 encodes a subunit of the KICSTOR protein complex, having a role in regulating nutrient sensing by MTOR complex-1 (Wolfson et al 2017 - PMID : 28199306).

Please consider inclusion in the ID panel with amber rating, pending further details.
Sources: Literature
Intellectual disability TFG BRIDGE consortium edited their review of TFG
Intellectual disability TFG BRIDGE consortium edited their review of TFG
Intellectual disability TFG Louise Daugherty classified TFG as amber
Intellectual disability TFG Louise Daugherty commented on TFG
Intellectual disability TFG BRIDGE consortium reviewed TFG