chr9-137162209-C-T

Variant names:

• chr9-137162209-C-T
• rs878853143
• NM_007327.4:c.1670C>T

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2 PM5 PP2 PP3_Strong PP5_Moderate

The NM_007327.4(GRIN1):​c.1670C>T​(p.Pro557Leu) 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. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P557R) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: GRIN1 NM_007327.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.26

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]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-137162209-C-G is described in Lovd as [Pathogenic].
• PP2: Missense variant in the GRIN1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 75 curated pathogenic missense variants (we use a threshold of 10). The gene has 49 curated benign missense variants. Gene score misZ: 6.2157 (above the threshold of 3.09). Trascript score misZ: 6.6419 (above the threshold of 3.09). GenCC associations: The gene is linked to developmental and epileptic encephalopathy 101, neurodevelopmental disorder with or without hyperkinetic movements and seizures, autosomal recessive, autosomal dominant non-syndromic intellectual disability, complex neurodevelopmental disorder, intellectual disability, autosomal dominant 8.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.951
• PP5: Variant 9-137162209-C-T is Pathogenic according to our data. Variant chr9-137162209-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 372881.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GRIN1	NM_007327.4	c.1670C>T	p.Pro557Leu	missense_variant	Exon 12 of 20	ENST00000371561.8	NP_015566.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GRIN1	ENST00000371561.8	c.1670C>T	p.Pro557Leu	missense_variant	Exon 12 of 20	1	NM_007327.4	ENSP00000360616.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1392036 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 687590

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Jan 25, 2016

GeneDx

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The P557L variant in the GRIN1 gene has not been reported previously as a pathogenic variant, noras a benign variant, to our knowledge. The P557L variant was not observed in approximately 6300individuals of European and African American ancestry in the NHLBI Exome Sequencing Project,indicating it is not a common benign variant in these populations. The P557L variant is asemi-conservative amino acid substitution, which may impact secondary protein structure as theseresidues differ in some properties. This substitution occurs at a position that is conserved acrossspecies and in silico analysis predicts this variant is probably damaging to the proteinstructure/function. Missense variants in the same and a nearby residue (D552G, P557R) have beenreported in the Human Gene Mutation Database in association with early-onset epilepticencephalopathy, intellectual disability, and developmental delay (Stenson et al., 2014), supporting thefunctional importance of this region of the protein. The P557L variant is a strong candidate for apathogenic variant, however the possibility is may be a rare benign variant cannot be excluded. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Uncertain	0.13
CADD	Pathogenic	33
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.86	D;.;.;T;.;.;.
Eigen	Pathogenic	0.76
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	1.0	D;D;D;D;D;D;D
M_CAP	Pathogenic	0.47	D
MetaRNN	Pathogenic	0.95	D;D;D;D;D;D;D
MetaSVM	Benign	-0.53	T
MutationAssessor	Pathogenic	3.1	M;M;.;.;.;M;.
PrimateAI	Pathogenic	0.93	D
PROVEAN	Pathogenic	-8.7	D;D;D;D;D;D;D
REVEL	Pathogenic	0.78
Sift	Uncertain	0.0010	D;D;D;D;D;D;D
Sift4G	Uncertain	0.0020	D;D;D;D;D;D;D
Polyphen		1.0	D;D;.;.;.;D;.
Vest4		0.94
MutPred		0.80		Loss of disorder (P = 0.0534);Loss of disorder (P = 0.0534);.;.;.;Loss of disorder (P = 0.0534);.;
MVP		0.93
MPC		3.4
ClinPred		1.0	D
GERP RS		3.8
Varity_R		0.95
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs878853143; hg19: chr9-140056661;