20-46009006-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_004994.3(MMP9):c.80C>T(p.Thr27Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000018 in 1,614,014 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. T27T) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 31)
  • Exomes 𝑓: 0.000017 (0 hom.)
• Consequence: MMP9 NM_004994.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.79

Genes affected

MMP9 (HGNC:7176): (matrix metallopeptidase 9) Proteins of the matrix metalloproteinase (MMP) family are involved in the breakdown of extracellular matrix in normal physiological processes, such as embryonic development, reproduction, and tissue remodeling, as well as in disease processes, such as arthritis and metastasis. Most MMP's are secreted as inactive proproteins which are activated when cleaved by extracellular proteinases. The enzyme encoded by this gene degrades type IV and V collagens. Studies in rhesus monkeys suggest that the enzyme is involved in IL-8-induced mobilization of hematopoietic progenitor cells from bone marrow, and murine studies suggest a role in tumor-associated tissue remodeling. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.066007435).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MMP9	NM_004994.3	c.80C>T	p.Thr27Ile	missense_variant	1/13	ENST00000372330.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MMP9	ENST00000372330.3	c.80C>T	p.Thr27Ile	missense_variant	1/13	1	NM_004994.3	P1

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152158 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.0000239 AC: 6 AN: 250778 Hom.: 0 AF XY: 0.0000148 AC XY: 2 AN XY: 135590

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000655

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000265

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.0000171 AC: 25 AN: 1461738 Hom.: 0 Cov.: 33 AF XY: 0.0000220 AC XY: 16 AN XY: 727150

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000104

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000899

Gnomad4 OTH exome AF: 0.0000662

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152276 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 74454

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.0000434 Hom.: 0

Bravo AF: 0.00000378

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Metaphyseal anadysplasia 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Al Jalila Children's Genomics Center, Al Jalila Childrens Speciality Hospital

Mar 19, 2020

- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Nov 28, 2022

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt MMP9 protein function. ClinVar contains an entry for this variant (Variation ID: 1301672). This variant has not been reported in the literature in individuals affected with MMP9-related conditions. This variant is present in population databases (rs201841087, gnomAD 0.007%). This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 27 of the MMP9 protein (p.Thr27Ile). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.29	T
BayesDel_noAF	Benign	-0.48
Cadd	Benign	13
Dann	Uncertain	0.99
DEOGEN2	Benign	0.077	T
Eigen	Benign	-0.47
Eigen_PC	Benign	-0.42
FATHMM_MKL	Benign	0.29	N
LIST_S2	Benign	0.48	T
M_CAP	Benign	0.0084	T
MetaRNN	Benign	0.066	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.0	M
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.44	T
PROVEAN	Benign	-0.060	N
REVEL	Benign	0.12
Sift	Benign	0.14	T
Sift4G	Benign	0.30	T
Polyphen		0.085	B
Vest4		0.18
MVP		0.57
ClinPred		0.14	T
GERP RS		3.6
Varity_R		0.091
gMVP		0.38

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: rs201841087; hg19: chr20-44637645;