Genetic Variant MAMDC2:p.Ala9Glu (chr9-70044223-C-A) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_153267.5(MAMDC2):c.26C>A(p.Ala9Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000548 in 1,461,082 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000055 ( 0 hom. )

Consequence

MAMDC2
NM_153267.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.519

Publications

0 publications found

Variant links:

Genes affected

MAMDC2 (HGNC:23673): (MAM domain containing 2) Predicted to enable glycosaminoglycan binding activity. Predicted to act upstream of or within peptide cross-linking via chondroitin 4-sulfate glycosaminoglycan. Located in endoplasmic reticulum. [provided by Alliance of Genome Resources, Apr 2022]

MAMDC2 links:

MAMDC2-AS1 (HGNC:48719): (MAMDC2 antisense RNA 1)

MAMDC2-AS1 links:

LOC124902179 (HGNC:):

LOC124902179 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.16719276).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
MAMDC2	NM_153267.5 link	c.26C>A	p.Ala9Glu	missense_variant	Exon 1 of 14	ENST00000377182.5	NP_694999.3
MAMDC2	NM_001347990.2 link	c.26C>A	p.Ala9Glu	missense_variant	Exon 1 of 12		NP_001334919.1
MAMDC2	NR_125850.1 link	n.643C>A		non_coding_transcript_exon_variant	Exon 1 of 14
LOC124902179	XR_007061571.1 link	n.-182G>T		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MAMDC2	ENST00000377182.5 link	c.26C>A	p.Ala9Glu	missense_variant	Exon 1 of 14	1	NM_153267.5	ENSP00000366387.4		Q7Z304-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000399

AC:

AN:

250508

AF XY:

0.00000738

show subpopulations

Gnomad AFR exome

AF:

0.0000617

Gnomad AMR exome

AF:

0.00

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

AF:

0.00000548

AC:

AN:

1461082

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

726936

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33476

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26130

East Asian (EAS)

AF:

0.00

AC:

AN:

39694

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52716

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000630

AC:

AN:

1111936

Other (OTH)

AF:

0.00

AC:

AN:

60380

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.456

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000378

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 05, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.26C>A (p.A9E) alteration is located in exon 1 (coding exon 1) of the MAMDC2 gene. This alteration results from a C to A substitution at nucleotide position 26, causing the alanine (A) at amino acid position 9 to be replaced by a glutamic acid (E). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.35

BayesDel_addAF

Benign

-0.31

BayesDel_noAF

Benign

-0.50

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.010

Eigen

Benign

-0.46

Eigen_PC

Benign

-0.37

FATHMM_MKL

Benign

0.24

LIST_S2

Benign

0.60

M_CAP

Benign

0.011

MetaRNN

Benign

0.17

MetaSVM

Benign

-0.77

MutationAssessor

Benign

0.0

PhyloP100

0.52

PrimateAI

Benign

0.43

PROVEAN

Benign

-0.65

REVEL

Benign

0.096

Sift

Benign

0.032

Sift4G

Benign

0.65

Polyphen

0.31

Vest4

0.29

MutPred

0.72

Gain of relative solvent accessibility (P = 0.09);

MVP

0.32

MPC

0.13

ClinPred

0.10

GERP RS

1.9

PromoterAI

-0.0049

Neutral

(source)

Varity_R

0.11

gMVP

0.59

Mutation Taster

=91/9

polymorphism

(source)

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

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

9-70044223-C-A

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