3-155084193-A-G

Variant names:

• chr3-155084193-A-G
• rs762748390
• NM_007289.4:c.26A>G

Variant summary

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

The NM_007289.4(MME):​c.26A>G​(p.Asp9Gly) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,461,844 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D9N) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: MME NM_007289.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.97
• Publications: 4 publications found

Genes affected

MME (HGNC:7154): (membrane metalloendopeptidase) The protein encoded by this gene is a type II transmembrane glycoprotein and a common acute lymphocytic leukemia antigen that is an important cell surface marker in the diagnosis of human acute lymphocytic leukemia (ALL). The encoded protein is present on leukemic cells of pre-B phenotype, which represent 85% of cases of ALL. This protein is not restricted to leukemic cells, however, and is found on a variety of normal tissues. The protein is a neutral endopeptidase that cleaves peptides at the amino side of hydrophobic residues and inactivates several peptide hormones including glucagon, enkephalins, substance P, neurotensin, oxytocin, and bradykinin. [provided by RefSeq, Aug 2017]

MME Gene-Disease associations (from GenCC):

• Charcot-Marie-Tooth disease axonal type 2T

  Inheritance: SD, AR, AD Classification: DEFINITIVE, STRONG, MODERATE, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen
• MME-related autosomal dominant Charcot Marie Tooth disease type 2

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• spinocerebellar ataxia 43

  Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), Orphanet
• Charcot-Marie-Tooth disease type 2T

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• congenital membranous nephropathy due to maternal anti-neutral endopeptidase alloimmunization

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MME	NM_007289.4	c.26A>G	p.Asp9Gly	missense_variant	Exon 2 of 23	ENST00000360490.7	NP_009220.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MME	ENST00000360490.7	c.26A>G	p.Asp9Gly	missense_variant	Exon 2 of 23	1	NM_007289.4	ENSP00000353679.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251444 AF XY: 0.00000736

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461844 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 727228

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

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

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111968

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Mar 14, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces aspartic acid, which is acidic and polar, with glycine, which is neutral and non-polar, at codon 9 of the MME protein (p.Asp9Gly). This variant is present in population databases (rs762748390, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with MME-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.43
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.35
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.37	T;T;T;T;.;T;T;T;T;.;T;.;T;T
Eigen	Uncertain	0.42
Eigen_PC	Uncertain	0.46
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Benign	0.83	.;T;.;T;T;.;.;.;.;T;T;.;T;T
M_CAP	Uncertain	0.12	D
MetaRNN	Uncertain	0.63	D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.52	D
MutationAssessor	Benign	0.90	L;.;L;.;.;.;L;L;L;.;.;.;.;L
PhyloP100		4.0
PrimateAI	Uncertain	0.76	T
PROVEAN	Benign	-1.5	N;.;N;N;.;D;N;N;N;N;N;D;N;.
REVEL	Pathogenic	0.70
Sift	Benign	0.056	T;.;T;D;.;D;T;T;T;D;T;.;D;.
Sift4G	Benign	0.48	T;D;T;T;D;D;T;T;T;T;D;.;T;T
Polyphen		0.95	P;.;P;.;.;.;P;P;P;.;.;.;.;P
Vest4		0.55
MutPred		0.38		Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);Loss of stability (P = 0.0178);
MVP		0.96
MPC		0.22
ClinPred		0.74	D
GERP RS		5.3
PromoterAI		-0.011	Neutral
Varity_R		0.15
gMVP		0.67
Mutation Taster		=58/42	polymorphism

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

Other links and lift over

dbSNP: rs762748390; hg19: chr3-154801982; COSMIC: COSV64705828;