rs1784410

chr11-102582265-A-Cchr11-102582265-A-Gchr11-102582265-A-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_004771.4(MMP20):c.1248-3123T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.52 in 151,910 control chromosomes in the GnomAD database, including 20,910 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.52 (20910 hom., cov: 31)
• Consequence: MMP20 NM_004771.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0970

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]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BA1: GnomAd4 highest subpopulation (SAS) allele frequency at 95% confidence interval = 0.642 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MMP20	NM_004771.4	c.1248-3123T>G		intron_variant		ENST00000260228.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MMP20	ENST00000260228.3	c.1248-3123T>G		intron_variant		1	NM_004771.4	P1
MMP20	ENST00000542305.1	n.145+1198T>G		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes AF: 0.520 AC: 78897 AN: 151792 Hom.: 20896 Cov.: 31

Gnomad AFR AF: 0.453

Gnomad AMI AF: 0.504

Gnomad AMR AF: 0.514

Gnomad ASJ AF: 0.518

Gnomad EAS AF: 0.392

Gnomad SAS AF: 0.661

Gnomad FIN AF: 0.508

Gnomad MID AF: 0.598

Gnomad NFE AF: 0.562

Gnomad OTH AF: 0.537

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.520 AC: 78935 AN: 151910 Hom.: 20910 Cov.: 31 AF XY: 0.518 AC XY: 38429 AN XY: 74236

Gnomad4 AFR AF: 0.453

Gnomad4 AMR AF: 0.514

Gnomad4 ASJ AF: 0.518

Gnomad4 EAS AF: 0.392

Gnomad4 SAS AF: 0.661

Gnomad4 FIN AF: 0.508

Gnomad4 NFE AF: 0.562

Gnomad4 OTH AF: 0.543

Alfa AF: 0.540 Hom.: 9257

Bravo AF: 0.518

Asia WGS AF: 0.565 AC: 1965 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
Cadd	Benign	1.2
Dann	Benign	0.72

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: rs1784410; hg19: chr11-102452996;