2-174749988-G-T

Position:

• chr2-174749988-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_000079.4(CHRNA1):​c.960C>A​(p.His320Gln) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. H320H) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CHRNA1 NM_000079.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.79

Genes affected

CHRNA1 (HGNC:1955): (cholinergic receptor nicotinic alpha 1 subunit) The muscle acetylcholine receptor consiststs of 5 subunits of 4 different types: 2 alpha subunits and 1 each of the beta, gamma, and delta subunits. This gene encodes an alpha subunit that plays a role in acetlycholine binding/channel gating. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Nov 2012]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.932

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHRNA1	NM_000079.4	c.960C>A	p.His320Gln	missense_variant	7/9	ENST00000348749.9	NP_000070.1
CHRNA1	NM_001039523.3	c.1035C>A	p.His345Gln	missense_variant	8/10		NP_001034612.1
CHRNA1	XM_017003256.2	c.1056C>A	p.His352Gln	missense_variant	7/9		XP_016858745.1
CHRNA1	XM_017003257.2	c.981C>A	p.His327Gln	missense_variant	6/8		XP_016858746.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHRNA1	ENST00000348749.9	c.960C>A	p.His320Gln	missense_variant	7/9	1	NM_000079.4	ENSP00000261008	P1
	ENST00000442996.1	n.321+20164G>T		intron_variant, non_coding_transcript_variant		1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Pathogenic	0.14
CADD	Pathogenic	26
DANN	Uncertain	0.98
DEOGEN2	Pathogenic	0.86	.;D;D;D;T
Eigen	Pathogenic	0.88
Eigen_PC	Pathogenic	0.81
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.95	D;D;D;D;D
M_CAP	Pathogenic	0.35	D
MetaRNN	Pathogenic	0.93	D;D;D;D;D
MetaSVM	Pathogenic	0.86	D
MutationAssessor	Pathogenic	3.3	.;M;.;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.78	T
PROVEAN	Pathogenic	-5.2	D;D;D;D;.
REVEL	Pathogenic	0.81
Sift	Uncertain	0.0040	D;D;D;D;.
Sift4G	Uncertain	0.024	D;D;D;D;.
Polyphen		1.0	.;D;.;.;.
Vest4		0.82
MutPred		0.82		.;Loss of sheet (P = 0.0817);.;.;.;
MVP		0.96
MPC		0.91
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.87
gMVP		0.88

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs2229957; hg19: chr2-175614716; COSMIC: COSV105029909; COSMIC: COSV105029909;