NM_004771.4:c.690T>G

Variant names:

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1PM2PP3_Strong

The NM_004771.4(MMP20):c.690T>G(p.His230Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000658 in 151,932 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00033 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

MMP20
NM_004771.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.234

Publications

0 publications found

Variant links:

Genes affected

MMP20 (HGNC:7167): (matrix metallopeptidase 20) 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 protein encoded by this gene degrades amelogenin, the major protein component of dental enamel matrix, and thus thought to play a role in tooth enamel formation. A mutation in this gene, which alters the normal splice pattern and results in premature termination of the encoded protein, has been associated with amelogenesis imperfecta. This gene is part of a cluster of MMP genes located on chromosome 11q22.3. [provided by RefSeq, Aug 2011]

MMP20 links:

MMP20-AS1 (HGNC:56362): (MMP20 antisense RNA 1)

MMP20-AS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_004771.4

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.982

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MMP20	NM_004771.4 link	c.690T>G	p.His230Gln	missense_variant	Exon 5 of 10	ENST00000260228.3	NP_004762.2	O60882

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MMP20	ENST00000260228.3 link	c.690T>G	p.His230Gln	missense_variant	Exon 5 of 10	1	NM_004771.4	ENSP00000260228.2	O60882
MMP20-AS1	ENST00000542119.2 link	n.233+1606A>C		intron_variant	Intron 1 of 3	3
MMP20-AS1	ENST00000782665.1 link	n.233+1606A>C		intron_variant	Intron 1 of 5

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

151932

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000795

AC:

AN:

251436

AF XY:

0.00000736

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.000330

AC:

464

AN:

1405362

Hom.:

Cov.:

AF XY:

0.000278

AC XY:

195

AN XY:

701722

show subpopulations

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

African (AFR)

AF:

0.000402

AC:

AN:

32354

American (AMR)

AF:

0.0000448

AC:

AN:

44642

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25764

East Asian (EAS)

AF:

0.0000508

AC:

AN:

39372

South Asian (SAS)

AF:

0.000117

AC:

AN:

85116

European-Finnish (FIN)

AF:

0.0000187

AC:

AN:

53346

Middle Eastern (MID)

AF:

0.000176

AC:

AN:

5674

European-Non Finnish (NFE)

AF:

0.000400

AC:

424

AN:

1060514

Other (OTH)

AF:

0.000188

AC:

AN:

58580

⚠️ 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.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.241

Heterozygous variant carriers

151

226

302

377

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.00000658

AC:

AN:

151932

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74238

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41432

American (AMR)

AF:

0.00

AC:

AN:

15272

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.00

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10534

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67908

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Amelogenesis imperfecta hypomaturation type 2A2

Uncertain:1

Feb 23, 2023

3billion

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The variant is observed at an extremely low frequency in the gnomAD v2.1.1 dataset (total allele frequency: <0.001%). Missense changes are a common disease-causing mechanism. In silico tool predictions suggest damaging effect of the variant on gene or gene product (REVEL: 0.91; 3Cnet: 0.97). Therefore, this variant is classified as VUS according to the recommendation of ACMG/AMP guideline. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

1.0

BayesDel_addAF

Pathogenic

0.40

BayesDel_noAF

Pathogenic

0.51

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.38

Eigen

Benign

-0.0099

Eigen_PC

Benign

-0.31

FATHMM_MKL

Benign

0.37

LIST_S2

Pathogenic

0.98

M_CAP

Pathogenic

0.51

MetaRNN

Pathogenic

0.98

MetaSVM

Pathogenic

1.0

MutationAssessor

Pathogenic

4.1

PhyloP100

-0.23

PrimateAI

Uncertain

0.75

PROVEAN

Pathogenic

-7.8

REVEL

Pathogenic

0.91

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.97

MutPred

0.90

Gain of sheet (P = 0.0101);

MVP

0.95

MPC

0.27

ClinPred

1.0

GERP RS

-4.7

Varity_R

0.98

gMVP

0.89

Mutation Taster

=41/59

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

NM_004771.4:c.690T>G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over