rs879255626

Variant names:

• chr5-14394102-G-A
• rs879255626
• NM_007118.4:c.4283G>A

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_007118.4(TRIO):​c.4283G>A​(p.Arg1428Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 13/22 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TRIO NM_007118.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:12 O:1
• Conservation: PhyloP100: 10.0
• Publications: 12 publications found

Genes affected

TRIO (HGNC:12303): (trio Rho guanine nucleotide exchange factor) This gene encodes a large protein that functions as a GDP to GTP exchange factor. This protein promotes the reorganization of the actin cytoskeleton, thereby playing a role in cell migration and growth. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2015]

TRIO Gene-Disease associations (from GenCC):

• syndromic intellectual disability

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen, Illumina
• intellectual developmental disorder, autosomal dominant 63, with macrocephaly

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: G2P, Ambry Genetics
• micrognathia-recurrent infections-behavioral abnormalities-mild intellectual disability syndrome

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 16 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in NM_007118.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.947
• PP5: Variant 5-14394102-G-A is Pathogenic according to our data. Variant chr5-14394102-G-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 253084.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRIO	NM_007118.4	c.4283G>A	p.Arg1428Gln	missense_variant	Exon 28 of 57	ENST00000344204.9	NP_009049.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TRIO	ENST00000344204.9	c.4283G>A	p.Arg1428Gln	missense_variant	Exon 28 of 57	1	NM_007118.4	ENSP00000339299.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:12 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Micrognathia-recurrent infections-behavioral abnormalities-mild intellectual disability syndrome Pathogenic:9 Other:1

Sep 10, 2020

SIB Swiss Institute of Bioinformatics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: curation

This variant is interpreted as pathogenic for Intellectual developmental disorder, autosomal dominant 44, with microcephaly. The following ACMG Tag(s) were applied: Absent from controls (or at extremely low frequency if recessive) in Exome Sequencing Project, 1000 Genomes Project, or Exome Aggregation Consortium (PM2); De novo (paternity and maternity confirmed) (PS2); Missense variant in a gene that has a low rate of benign missense variation and in which missense variants are a common mechanism of disease (PP2); Multiple lines of computational evidence support a deleterious effect on the gene or gene product (PP3); Located in a mutational hot spot and/or critical and well-established functional domain (e.g., active site of an enzyme) without benign variation (PM1); Well-established functional studies show a deleterious effect (PS3 downgraded to moderate). -

May 30, 2018

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was determined to be pathogenic according to ACMG Guidelines, 2015 [PMID:25741868]. This variant has been previously reported as de novo in one patient with global developmental delay [PMID 27418539] -

Mar 31, 2020

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Jun 01, 2022

Solve-RD Consortium

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: provider interpretation

Variant confirmed as disease-causing by referring clinical team -

-

GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Oct 06, 2021

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was identified as de novo (maternity and paternity confirmed)._x000D_ Criteria applied: PS2, PS4_MOD, PS3_SUP, PM1_SUP, PM2_SUP, PP2, PP3 -

Apr 19, 2022

MGZ Medical Genetics Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 14, 2025

Department of Human Genetics, Hannover Medical School

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG: PS3_Supporting, PS4_Moderate, PM1_Supporting, PM2_Supporting, PM6, PP2, PP3 -

May 22, 2022

3billion

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The variant is not observed in the gnomAD v2.1.1 dataset. Missense changes are a common disease-causing mechanism. Functional studies provide strong evidence of the variant having a damaging effect on the gene or gene product (PMID:32109419). In silico tool predictions suggest damaging effect of the variant on gene or gene product (REVEL: 0.73; 3Cnet: 0.84). Same nucleotide change resulting in same amino acid change has been previously reported as pathogenic/likely pathogenic with strong evidence (ClinVar ID: VCV000253084). The variant has been previously reported as de novo in a similarly affected individual (PMID: 32109419). Therefore, this variant is classified as pathogenic according to the recommendation of ACMG/AMP guideline. -

Sep 28, 2017

Molecular Genetics Laboratory, BC Children's and BC Women's Hospitals

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided Pathogenic:2

May 27, 2022

Clinical Genetics Laboratory, Skane University Hospital Lund

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 07, 2023

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Published functional studies demonstrate a damaging effect (reduced ability to activate Rac1 as compared to wild-type) (Pengelly et al., 2016); Not observed in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 28928363, 24782526, 27418539, 32109419, 31785789, 33038108, 35599849, 34697084, 36717740) -

TRIO-related disorder Pathogenic:1

Apr 27, 2023

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The TRIO c.4283G>A variant is predicted to result in the amino acid substitution p.Arg1428Gln. This variant has been reported to occur de novo in individuals with TRIO-related autosomal dominant intellectual developmental disorder (Patient 4; Pengelly et al. 2016. PubMed ID: 27418539; Barbosa et al. 2020. PubMed ID: 32109419). Functional studies suggest this variant impairs Trio-mediated Rac1 activation (Pengelly et al. 2016. PubMed ID: 27418539). This variant occurs in the Dbl homology domain (DH1), which is considered a mutation hotspot in the TRIO protein (Sadybekov. 2017. PubMed ID: 28928363). This variant has not been reported in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. This variant is interpreted as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.33
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.38	T;T;T
Eigen	Pathogenic	0.99
Eigen_PC	Pathogenic	0.92
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	D;D;D
M_CAP	Pathogenic	0.37	D
MetaRNN	Pathogenic	0.95	D;D;D
MetaSVM	Uncertain	0.51	D
MutationAssessor	Pathogenic	4.1	H;.;.
PhyloP100		10
PrimateAI	Pathogenic	0.90	D
PROVEAN	Uncertain	-3.4	D;D;.
REVEL	Pathogenic	0.73
Sift	Pathogenic	0.0	D;D;.
Sift4G	Pathogenic	0.0	D;D;D
Polyphen		1.0	D;D;.
Vest4		0.97
MutPred		0.82		Loss of MoRF binding (P = 0.0256);.;.;
MVP		0.72
MPC		2.1
ClinPred		1.0	D
GERP RS		5.1
Varity_R		0.93
gMVP		0.92
Mutation Taster		=11/89	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs879255626; hg19: chr5-14394211; COSMIC: COSV60078769; COSMIC: COSV60078769;