NM_001001656.3:c.276A>G

Variant names:

• chr7-141919151-A-G
• NM_001001656.3:c.276A>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001001656.3(OR9A4):​c.276A>G​(p.Ile92Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000479 in 1,461,882 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: OR9A4 NM_001001656.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.826
• Publications: 0 publications found

Genes affected

OR9A4 (HGNC:15095): (olfactory receptor family 9 subfamily A member 4) Olfactory receptors interact with odorant molecules in the nose, to initiate a neuronal response that triggers the perception of a smell. The olfactory receptor proteins are members of a large family of G-protein-coupled receptors (GPCR) arising from single coding-exon genes. Olfactory receptors share a 7-transmembrane domain structure with many neurotransmitter and hormone receptors and are responsible for the recognition and G protein-mediated transduction of odorant signals. The olfactory receptor gene family is the largest in the genome. The nomenclature assigned to the olfactory receptor genes and proteins for this organism is independent of other organisms. [provided by RefSeq, Jul 2008]

MGAM (HGNC:7043): (maltase-glucoamylase) This gene encodes maltase-glucoamylase, which is a brush border membrane enzyme that plays a role in the final steps of digestion of starch. The protein has two catalytic sites identical to those of sucrase-isomaltase, but the proteins are only 59% homologous. Both are members of glycosyl hydrolase family 31, which has a variety of substrate specificities. [provided by RefSeq, Jul 2008]

MGAM Gene-Disease associations (from GenCC):

• Tourette syndrome

  Inheritance: Unknown Classification: NO_KNOWN Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.12774402).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OR9A4	NM_001001656.3	c.276A>G	p.Ile92Met	missense_variant	Exon 2 of 2	ENST00000641559.1	NP_001001656.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OR9A4	ENST00000641559.1	c.276A>G	p.Ile92Met	missense_variant	Exon 2 of 2		NM_001001656.3	ENSP00000493151.1
OR9A4	ENST00000548136.1	c.276A>G	p.Ile92Met	missense_variant	Exon 1 of 1	6		ENSP00000448789.1
MGAM	ENST00000465654.5	c.-180+11283A>G		intron_variant	Intron 1 of 5	3		ENSP00000419372.1
MGAM	ENST00000497554.1	n.37-10626A>G		intron_variant	Intron 1 of 2	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461882 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727244

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.00000629 AC: 7 AN: 1112004

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Sep 20, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.276A>G (p.I92M) alteration is located in exon 1 (coding exon 1) of the OR9A4 gene. This alteration results from a A to G substitution at nucleotide position 276, causing the isoleucine (I) at amino acid position 92 to be replaced by a methionine (M). 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	0.16
BayesDel_addAF	Benign	-0.29	T
BayesDel_noAF	Benign	-0.65
CADD	Benign	2.2
DANN	Benign	0.47
DEOGEN2	Benign	0.021	T;T
Eigen	Benign	-0.71
Eigen_PC	Benign	-0.90
FATHMM_MKL	Benign	0.077	N
LIST_S2	Benign	0.48	.;T
M_CAP	Benign	0.00079	T
MetaRNN	Benign	0.13	T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Uncertain	2.2	M;M
PhyloP100		-0.83
PrimateAI	Benign	0.23	T
PROVEAN	Benign	-2.1	.;N
REVEL	Benign	0.040
Sift	Benign	0.091	.;T
Sift4G	Benign	0.10	.;T
Polyphen		0.66	P;P
Vest4		0.21
MutPred		0.37		Loss of catalytic residue at I92 (P = 0.0088);Loss of catalytic residue at I92 (P = 0.0088);
MVP		0.26
MPC		0.038
ClinPred		0.15	T
GERP RS		0.017
PromoterAI		0.0084	Neutral
Varity_R		0.057
gMVP		0.079
Mutation Taster		=98/2	polymorphism

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

hg19: chr7-141618951;