9-137163642-C-T

Variant names:

• chr9-137163642-C-T
• rs1554770589
• NM_007327.4:c.2417C>T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 7P and 1B. PM1 PM2 PM5 PP5 BP4

The NM_007327.4(GRIN1):​c.2417C>T​(p.Ala806Val) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A806E) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: GRIN1 NM_007327.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3 U:1
• Conservation: PhyloP100: 5.47
• Publications: 0 publications found

Genes affected

GRIN1 (HGNC:4584): (glutamate ionotropic receptor NMDA type subunit 1) The protein encoded by this gene is a critical subunit of N-methyl-D-aspartate receptors, members of the glutamate receptor channel superfamily which are heteromeric protein complexes with multiple subunits arranged to form a ligand-gated ion channel. These subunits play a key role in the plasticity of synapses, which is believed to underlie memory and learning. Cell-specific factors are thought to control expression of different isoforms, possibly contributing to the functional diversity of the subunits. Alternatively spliced transcript variants have been described. [provided by RefSeq, Jul 2008]

GRIN1 Gene-Disease associations (from GenCC):

• neurodevelopmental disorder with or without hyperkinetic movements and seizures, autosomal dominant

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• complex neurodevelopmental disorder

  Inheritance: AR, AD Classification: DEFINITIVE Submitted by: ClinGen
• neurodevelopmental disorder with or without hyperkinetic movements and seizures, autosomal recessive

  Inheritance: AR Classification: DEFINITIVE, MODERATE Submitted by: G2P, Ambry Genetics
• developmental and epileptic encephalopathy 101

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• autosomal dominant non-syndromic intellectual disability

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_007327.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-137163642-C-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 522682.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP5: Variant 9-137163642-C-T is Pathogenic according to our data. Variant chr9-137163642-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 810481.
• BP4: Computational evidence support a benign effect (MetaRNN=0.3340088). . Strength limited to SUPPORTING due to the PP5.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_007327.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GRIN1	NM_007327.4	MANE Select	c.2417C>T	p.Ala806Val	missense	Exon 17 of 20	NP_015566.1
	GRIN1	NM_001437330.1		c.2480C>T	p.Ala827Val	missense	Exon 18 of 21	NP_001424259.1
	GRIN1	NM_001185090.2		c.2480C>T	p.Ala827Val	missense	Exon 18 of 21	NP_001172019.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GRIN1	ENST00000371561.8	TSL:1 MANE Select	c.2417C>T	p.Ala806Val	missense	Exon 17 of 20	ENSP00000360616.3
	GRIN1	ENST00000371553.8	TSL:1	c.2480C>T	p.Ala827Val	missense	Exon 18 of 21	ENSP00000360608.3
	GRIN1	ENST00000371560.5	TSL:1	c.2480C>T	p.Ala827Val	missense	Exon 18 of 20	ENSP00000360615.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Neurodevelopmental disorder with or without hyperkinetic movements and seizures, autosomal dominant Pathogenic:2

Apr 20, 2023

Baylor Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Feb 02, 2021

Genetics and Molecular Pathology, SA Pathology

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PS2, PM2, PM1

GRIN1-related disorder Pathogenic:1

Apr 19, 2023

PreventionGenetics, part of Exact Sciences

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The GRIN1 c.2417C>T variant is predicted to result in the amino acid substitution p.Ala806Val. To our knowledge, this variant has not been reported in the literature or in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. This variant is interpreted as likely pathogenic.

not provided Uncertain:1

Jun 01, 2019

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Benign	-0.019	T
BayesDel_noAF	Benign	-0.26
CADD	Pathogenic	32
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.66	D
Eigen	Uncertain	0.46
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.95	D
M_CAP	Uncertain	0.24	D
MetaRNN	Benign	0.33	T
MetaSVM	Benign	-0.40	T
MutationAssessor	Uncertain	2.1	M
PhyloP100		5.5
PrimateAI	Uncertain	0.78	T
PROVEAN	Uncertain	-3.0	D
REVEL	Benign	0.21
Sift	Uncertain	0.020	D
Sift4G	Benign	0.061	T
Polyphen		0.99	D
Vest4		0.31
MutPred		0.39		Loss of disorder (P = 0.0517)
MVP		0.68
MPC		3.2
ClinPred		0.99	D
GERP RS		4.0
Varity_R		0.60
gMVP		0.96
Mutation Taster		=31/69	disease causing

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: rs1554770589; hg19: chr9-140058094;