2-118942319-C-A

Variant summary

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

The NM_006770.4(MARCO):c.19C>A(p.Leu7Ile) 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. 16/21 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)
• Consequence: MARCO NM_006770.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.122

Genes affected

MARCO (HGNC:6895): (macrophage receptor with collagenous structure) The protein encoded by this gene is a member of the class A scavenger receptor family and is part of the innate antimicrobial immune system. The protein may bind both Gram-negative and Gram-positive bacteria via an extracellular, C-terminal, scavenger receptor cysteine-rich (SRCR) domain. In addition to short cytoplasmic and transmembrane domains, there is an extracellular spacer domain and a long, extracellular collagenous domain. The protein may form a trimeric molecule by the association of the collagenous domains of three identical polypeptide chains. [provided by RefSeq, Jul 2008]

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=0.20330536).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MARCO	NM_006770.4	c.19C>A	p.Leu7Ile	missense_variant	1/17	ENST00000327097.5
MARCO	XM_011512082.3	c.19C>A	p.Leu7Ile	missense_variant	1/17
MARCO	XM_011512083.4	c.19C>A	p.Leu7Ile	missense_variant	1/14
MARCO	XM_017005171.3	c.19C>A	p.Leu7Ile	missense_variant	1/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MARCO	ENST00000327097.5	c.19C>A	p.Leu7Ile	missense_variant	1/17	1	NM_006770.4	P1
MARCO	ENST00000412481.1	c.-349C>A		5_prime_UTR_variant	1/4	4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

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

Feb 10, 2022

The c.19C>A (p.L7I) alteration is located in exon 1 (coding exon 1) of the MARCO gene. This alteration results from a C to A substitution at nucleotide position 19, causing the leucine (L) at amino acid position 7 to be replaced by an isoleucine (I). 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	0.10
BayesDel_addAF	Benign	-0.066	T
BayesDel_noAF	Benign	-0.33
Cadd	Benign	16
Dann	Benign	0.87
DEOGEN2	Benign	0.25	T
Eigen	Benign	-0.37
Eigen_PC	Benign	-0.48
FATHMM_MKL	Benign	0.057	N
LIST_S2	Benign	0.48	T
M_CAP	Benign	0.042	D
MetaRNN	Benign	0.20	T
MetaSVM	Uncertain	-0.13	T
MutationAssessor	Benign	1.5	L
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-0.66	N
REVEL	Benign	0.24
Sift	Uncertain	0.025	D
Sift4G	Uncertain	0.026	D
Polyphen		0.96	P
Vest4		0.20
MutPred		0.22		Gain of catalytic residue at L12 (P = 0.0391);
MVP		0.88
MPC		0.20
ClinPred		0.30	T
GERP RS		1.2
Varity_R		0.086
gMVP		0.21

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: chr2-119699895;