16-55479499-G-T

Variant names:

• chr16-55479499-G-T
• rs746268212
• NM_004530.6:c.20G>T

Variant summary

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

The NM_004530.6(MMP2):​c.20G>T​(p.Arg7Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000696 in 1,436,982 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R7Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: MMP2 NM_004530.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0160
• Publications: 0 publications found

Genes affected

MMP2 (HGNC:7166): (matrix metallopeptidase 2) This gene is a member of the matrix metalloproteinase (MMP) gene family, that are zinc-dependent enzymes capable of cleaving components of the extracellular matrix and molecules involved in signal transduction. The protein encoded by this gene is a gelatinase A, type IV collagenase, that contains three fibronectin type II repeats in its catalytic site that allow binding of denatured type IV and V collagen and elastin. Unlike most MMP family members, activation of this protein can occur on the cell membrane. This enzyme can be activated extracellularly by proteases, or, intracellulary by its S-glutathiolation with no requirement for proteolytical removal of the pro-domain. This protein is thought to be involved in multiple pathways including roles in the nervous system, endometrial menstrual breakdown, regulation of vascularization, and metastasis. Mutations in this gene have been associated with Winchester syndrome and Nodulosis-Arthropathy-Osteolysis (NAO) syndrome. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Oct 2014]

MMP2 Gene-Disease associations (from GenCC):

• multicentric osteolysis, nodulosis, and arthropathy

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• multicentric osteolysis-nodulosis-arthropathy spectrum

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

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=0.10190499).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MMP2	NM_004530.6	c.20G>T	p.Arg7Leu	missense_variant	Exon 1 of 13	ENST00000219070.9	NP_004521.1
MMP2	NM_001302508.1	c.-76+534G>T		intron_variant	Intron 1 of 12		NP_001289437.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MMP2	ENST00000219070.9	c.20G>T	p.Arg7Leu	missense_variant	Exon 1 of 13	1	NM_004530.6	ENSP00000219070.4
MMP2	ENST00000570308.5	c.-75-3410G>T		intron_variant	Intron 2 of 13	1		ENSP00000461421.1
MMP2	ENST00000568715.5	c.-76+534G>T		intron_variant	Intron 1 of 3	4		ENSP00000457949.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.96e-7 AC: 1 AN: 1436982 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 712696

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 32864

American (AMR) AF: 0.00 AC: 0 AN: 41542

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25604

East Asian (EAS) AF: 0.00 AC: 0 AN: 38162

South Asian (SAS) AF: 0.00 AC: 0 AN: 83598

European-Finnish (FIN) AF: 0.0000201 AC: 1 AN: 49820

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5652

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1100424

Other (OTH) AF: 0.00 AC: 0 AN: 59316

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.62
CADD	Benign	14
DANN	Benign	0.88
DEOGEN2	Benign	0.12	T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.24	N
LIST_S2	Benign	0.42	T
M_CAP	Pathogenic	0.33	D
MetaRNN	Benign	0.10	T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.2	L
PhyloP100		-0.016
PrimateAI	Uncertain	0.62	T
PROVEAN	Benign	0.26	N
REVEL	Benign	0.040
Sift	Benign	0.10	T
Sift4G	Benign	0.10	T
Polyphen		0.0	B
Vest4		0.13
MutPred		0.59		Loss of methylation at R7 (P = 0.0087);
MVP		0.13
MPC		0.39
ClinPred		0.097	T
GERP RS		0.87
PromoterAI		0.071	Neutral
Varity_R		0.048
gMVP		0.53

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

dbSNP: rs746268212; hg19: chr16-55513411;