NM_004771.4:c.723A>G

Variant names:

• chr11-102609025-T-C
• rs139717539
• NM_004771.4:c.723A>G

Variant summary

Our verdict is Benign. The variant received -10 ACMG points: 0P and 10B. BP4_Strong BP7 BS1_Supporting BS2

The NM_004771.4(MMP20):​c.723A>G​(p.Ser241Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00109 in 1,614,038 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00081 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0011 (3 hom.)
• Consequence: MMP20 NM_004771.4 synonymous
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -2.06
• Publications: 0 publications found

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

ACMG classification

Our verdict: Benign. The variant received -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.81).
• BP7: Synonymous conserved (PhyloP=-2.06 with no splicing effect.
• BS1: Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.000807 (123/152322) while in subpopulation NFE AF = 0.00137 (93/68032). AF 95% confidence interval is 0.00114. There are 0 homozygotes in GnomAd4. There are 61 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High Homozygotes in GnomAdExome4 at 3 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004771.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MMP20	NM_004771.4	MANE Select	c.723A>G	p.Ser241Ser	synonymous	Exon 5 of 10	NP_004762.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MMP20	ENST00000260228.3	TSL:1 MANE Select	c.723A>G	p.Ser241Ser	synonymous	Exon 5 of 10	ENSP00000260228.2	O60882
	MMP20-AS1	ENST00000542119.2	TSL:3	n.233+1573T>C		intron	N/A
	MMP20-AS1	ENST00000782665.1		n.233+1573T>C		intron	N/A

Frequencies

GnomAD3 genomes AF: 0.000802 AC: 122 AN: 152204 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000193

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00111

Gnomad ASJ AF: 0.000577

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00137

Gnomad OTH AF: 0.000958

GnomAD2 exomes AF: 0.000664 AC: 167 AN: 251462 AF XY: 0.000648

Gnomad AFR exome AF: 0.0000615

Gnomad AMR exome AF: 0.000925

Gnomad ASJ exome AF: 0.000298

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00113

Gnomad OTH exome AF: 0.000489

GnomAD4 exome AF: 0.00112 AC: 1641 AN: 1461716 Hom.: 3 Cov.: 32 AF XY: 0.00106 AC XY: 774 AN XY: 727172

African (AFR) AF: 0.0000896 AC: 3 AN: 33478

American (AMR) AF: 0.00107 AC: 48 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.000536 AC: 14 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.0000187 AC: 1 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00137 AC: 1523 AN: 1111848

Other (OTH) AF: 0.000861 AC: 52 AN: 60394

GnomAD4 genome AF: 0.000807 AC: 123 AN: 152322 Hom.: 0 Cov.: 32 AF XY: 0.000819 AC XY: 61 AN XY: 74494

African (AFR) AF: 0.000192 AC: 8 AN: 41566

American (AMR) AF: 0.00118 AC: 18 AN: 15308

Ashkenazi Jewish (ASJ) AF: 0.000577 AC: 2 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5190

South Asian (SAS) AF: 0.00 AC: 0 AN: 4822

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00137 AC: 93 AN: 68032

Other (OTH) AF: 0.000948 AC: 2 AN: 2110

Alfa AF: 0.00101 Hom.: 1

Bravo AF: 0.000994

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Amelogenesis imperfecta hypomaturation type 2A2 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.81
CADD	Benign	2.5
DANN	Benign	0.70
PhyloP100		-2.1
Mutation Taster		=99/1	polymorphism

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: rs139717539; hg19: chr11-102479756;