chr3-51709413-T-C

Variant names:

• chr3-51709413-T-C
• rs149255850
• NM_000839.5:c.430T>C

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_000839.5(GRM2):​c.430T>C​(p.Tyr144His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000071 in 1,408,074 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y144D) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: GRM2 NM_000839.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 8.02
• Publications: 0 publications found

Genes affected

GRM2 (HGNC:4594): (glutamate metabotropic receptor 2) L-glutamate is the major excitatory neurotransmitter in the central nervous system and activates both ionotropic and metabotropic glutamate receptors. Glutamatergic neurotransmission is involved in most aspects of normal brain function and can be perturbed in many neuropathologic conditions. The metabotropic glutamate receptors are a family of G protein-coupled receptors, that have been divided into 3 groups on the basis of sequence homology, putative signal transduction mechanisms, and pharmacologic properties. Group I includes GRM1 and GRM5 and these receptors have been shown to activate phospholipase C. Group II includes GRM2 and GRM3 while Group III includes GRM4, GRM6, GRM7 and GRM8. Group II and III receptors are linked to the inhibition of the cyclic AMP cascade but differ in their agonist selectivities. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2017]

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.843

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000839.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GRM2	NM_000839.5	MANE Select	c.430T>C	p.Tyr144His	missense	Exon 2 of 6	NP_000830.2	Q14416
	GRM2	NM_001349117.2		c.-920T>C		5_prime_UTR	Exon 2 of 7	NP_001336046.1
	GRM2	NM_001349116.2		c.-139+2246T>C		intron	N/A	NP_001336045.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GRM2	ENST00000395052.8	TSL:2 MANE Select	c.430T>C	p.Tyr144His	missense	Exon 2 of 6	ENSP00000378492.3	Q14416
	GRM2	ENST00000296479.9	TSL:1	n.430T>C		non_coding_transcript_exon	Exon 2 of 7	ENSP00000296479.5	H7BXL3
	GRM2	ENST00000464585.1	TSL:1	n.2109T>C		non_coding_transcript_exon	Exon 1 of 4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.10e-7 AC: 1 AN: 1408074 Hom.: 0 Cov.: 31 AF XY: 0.00000145 AC XY: 1 AN XY: 690608

African (AFR) AF: 0.0000305 AC: 1 AN: 32762

American (AMR) AF: 0.00 AC: 0 AN: 42372

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24030

East Asian (EAS) AF: 0.00 AC: 0 AN: 38482

South Asian (SAS) AF: 0.00 AC: 0 AN: 80728

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50816

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5586

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1075228

Other (OTH) AF: 0.00 AC: 0 AN: 58070

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.81
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.13
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.50	D
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	D
M_CAP	Benign	0.062	D
MetaRNN	Pathogenic	0.84	D
MetaSVM	Uncertain	0.46	D
MutationAssessor	Uncertain	2.8	M
PhyloP100		8.0
PrimateAI	Pathogenic	0.87	D
PROVEAN	Uncertain	-2.7	D
REVEL	Pathogenic	0.75
Sift	Benign	0.18	T
Sift4G	Benign	0.56	T
Polyphen		1.0	D
Vest4		0.83
MutPred		0.66		Gain of disorder (P = 0.0418)
MVP		0.71
MPC		1.7
ClinPred		0.98	D
GERP RS		5.4
Varity_R		0.65
gMVP		0.77
Mutation Taster		=44/56	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: rs149255850; hg19: chr3-51743429;