7-17299271-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001621.5(AHR):c.7A>G(p.Ser3Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S3T) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: AHR NM_001621.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.990

Genes affected

AHR (HGNC:348): (aryl hydrocarbon receptor) The protein encoded by this gene is a ligand-activated helix-loop-helix transcription factor involved in the regulation of biological responses to planar aromatic hydrocarbons. This receptor has been shown to regulate xenobiotic-metabolizing enzymes such as cytochrome P450. Before ligand binding, the encoded protein is sequestered in the cytoplasm; upon ligand binding, this protein moves to the nucleus and stimulates transcription of target genes. [provided by RefSeq, Sep 2015]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.076226145).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AHR	NM_001621.5	c.7A>G	p.Ser3Gly	missense_variant	1/11	ENST00000242057.9
LOC101927609	XR_007060234.1	n.50T>C		non_coding_transcript_exon_variant	1/12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AHR	ENST00000242057.9	c.7A>G	p.Ser3Gly	missense_variant	1/11	1	NM_001621.5	P2
	ENST00000643090.1	n.18T>C		non_coding_transcript_exon_variant	1/3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Apr 24, 2021

Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The glycine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This variant has not been reported in the literature in individuals with AHR-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces serine with glycine at codon 3 of the AHR protein (p.Ser3Gly). The serine residue is weakly conserved and there is a small physicochemical difference between serine and glycine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.071
BayesDel_addAF	Benign	-0.29	T
BayesDel_noAF	Benign	-0.66
Cadd	Benign	19
Dann	Uncertain	0.98
DEOGEN2	Benign	0.16	T
Eigen	Benign	-0.56
Eigen_PC	Benign	-0.42
FATHMM_MKL	Benign	0.10	N
M_CAP	Benign	0.073	D
MetaRNN	Benign	0.076	T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	0.20	N
MutationTaster	Benign	1.0	N
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-1.2	N
REVEL	Benign	0.038
Sift	Benign	0.061	T
Sift4G	Benign	0.28	T
Polyphen		0.0	B
Vest4		0.11
MutPred		0.18		Loss of phosphorylation at S3 (P = 0.0241);
MVP		0.20
MPC		0.10
ClinPred		0.13	T
GERP RS		0.45
Varity_R		0.15
gMVP		0.50

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

LitVar

Other links and lift over

dbSNP: rs1781928345; hg19: chr7-17338895;