6-88144146-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_016083.6(CNR1):c.1129A>G(p.Thr377Ala) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. T377T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CNR1 NM_016083.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.17

Genes affected

CNR1 (HGNC:2159): (cannabinoid receptor 1) This gene encodes one of two cannabinoid receptors. The cannabinoids, principally delta-9-tetrahydrocannabinol and synthetic analogs, are psychoactive ingredients of marijuana. The cannabinoid receptors are members of the guanine-nucleotide-binding protein (G-protein) coupled receptor family, which inhibit adenylate cyclase activity in a dose-dependent, stereoselective and pertussis toxin-sensitive manner. The two receptors have been found to be involved in the cannabinoid-induced CNS effects (including alterations in mood and cognition) experienced by users of marijuana. Multiple transcript variants encoding two different protein isoforms have been described for this gene. [provided by RefSeq, May 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, CNR1

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CNR1	NM_016083.6	c.1129A>G	p.Thr377Ala	missense_variant	2/2	ENST00000369501.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CNR1	ENST00000369501.3	c.1129A>G	p.Thr377Ala	missense_variant	2/2	1	NM_016083.6	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 13, 2021

The c.1129A>G (p.T377A) alteration is located in exon 2 (coding exon 1) of the CNR1 gene. This alteration results from a A to G substitution at nucleotide position 1129, causing the threonine (T) at amino acid position 377 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Uncertain	0.059	T
BayesDel_noAF	Benign	-0.15
Cadd	Uncertain	24
Dann	Uncertain	1.0
DEOGEN2	Benign	0.12	T;T;T;.;T
Eigen	Uncertain	0.50
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Uncertain	0.96	D
M_CAP	Benign	0.023	T
MetaRNN	Uncertain	0.66	D;D;D;D;D
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.2	L;L;L;.;L
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.84	D
PROVEAN	Benign	-0.25	N;N;N;N;N
REVEL	Benign	0.19
Sift	Benign	0.049	D;D;D;T;D
Sift4G	Benign	0.71	T;T;T;T;T
Polyphen		0.97	D;D;D;D;D
Vest4		0.61
MutPred		0.73		Gain of catalytic residue at T377 (P = 0.0436);Gain of catalytic residue at T377 (P = 0.0436);Gain of catalytic residue at T377 (P = 0.0436);.;Gain of catalytic residue at T377 (P = 0.0436);
MVP		0.76
ClinPred		0.89	D
GERP RS		6.0
Varity_R		0.29
gMVP		0.80

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-88853865;