1-220797998-G-C

Position:

• chr1-220797998-G-C

Variant summary

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

The NM_022746.4(MTARC1):​c.737G>C​(p.Cys246Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely benignin UniProt.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MTARC1 NM_022746.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.81

Genes affected

MTARC1 (HGNC:26189): (mitochondrial amidoxime reducing component 1) Enables molybdenum ion binding activity; molybdopterin cofactor binding activity; and oxidoreductase activity, acting on other nitrogenous compounds as donors. Contributes to nitrite reductase (NO-forming) activity. Involved in cellular detoxification of nitrogen compound; nitrate metabolic process; and nitric oxide biosynthetic process. Located in mitochondrion. Part of nitric-oxide synthase complex. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MTARC1	NM_022746.4	c.737G>C	p.Cys246Ser	missense_variant	4/7	ENST00000366910.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MTARC1	ENST00000366910.10	c.737G>C	p.Cys246Ser	missense_variant	4/7	1	NM_022746.4	P1

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 specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 05, 2024

The c.737G>C (p.C246S) alteration is located in exon 4 (coding exon 4) of the MARC1 gene. This alteration results from a G to C substitution at nucleotide position 737, causing the cysteine (C) at amino acid position 246 to be replaced by a serine (S). 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	0.31
BayesDel_addAF	Uncertain	0.057	T
BayesDel_noAF	Benign	-0.16
CADD	Uncertain	24
DANN	Uncertain	0.98
DEOGEN2	Benign	0.056	T;T
Eigen	Benign	0.15
Eigen_PC	Benign	0.13
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.73	T;D
M_CAP	Benign	0.065	D
MetaRNN	Uncertain	0.59	D;D
MetaSVM	Benign	-0.54	T
MutationAssessor	Benign	1.9	M;.
MutationTaster	Benign	1.0	D
PrimateAI	Benign	0.37	T
PROVEAN	Pathogenic	-9.7	D;D
REVEL	Benign	0.28
Sift	Uncertain	0.0020	D;T
Sift4G	Uncertain	0.044	D;T
Polyphen		0.99	D;.
Vest4		0.31
MutPred		0.25		Loss of stability (P = 0.0223);.;
MVP		0.52
MPC		0.26
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.85
gMVP		0.66

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-220971340;