Genetic Variant MBNL2:p.Asp204Gly (chr13-97346874-A-G) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3

The NM_001382683.1(MBNL2):c.611A>G(p.Asp204Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,744 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: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

MBNL2
NM_001382683.1 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 9.32

Variant links:

Genes affected

MBNL2 (HGNC:16746): (muscleblind like splicing regulator 2) This gene is a member of the muscleblind protein family which was initially described in Drosophila melanogaster. This gene encodes a C3H-type zinc finger protein that modulates alternative splicing of pre-mRNAs. Muscleblind proteins bind specifically to expanded dsCUG RNA but not to normal size CUG repeats and may thereby play a role in the pathophysiology of myotonic dystrophy. Several alternatively spliced transcript variants have been described but the full-length natures of only some have been determined. [provided by RefSeq, Mar 2012]

MBNL2 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.788

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MBNL2	NM_001382683.1 link	c.611A>G	p.Asp204Gly	missense_variant	Exon 5 of 9	ENST00000679496.1	NP_001369612.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MBNL2	ENST00000679496.1 link	c.611A>G	p.Asp204Gly	missense_variant	Exon 5 of 9		NM_001382683.1	ENSP00000505596.1		A0A7P0T9I3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461744

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727212

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Sep 10, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.611A>G (p.D204G) alteration is located in exon 5 (coding exon 4) of the MBNL2 gene. This alteration results from a A to G substitution at nucleotide position 611, causing the aspartic acid (D) at amino acid position 204 to be replaced by a glycine (G). 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

Pathogenic

0.72

BayesDel_addAF

Pathogenic

0.27

BayesDel_noAF

Pathogenic

0.14

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.60

.;D;.;.

Eigen

Pathogenic

0.72

Eigen_PC

Pathogenic

0.76

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Pathogenic

0.98

D;D;.;D

M_CAP

Benign

0.058

MetaRNN

Pathogenic

0.79

D;D;D;D

MetaSVM

Benign

-0.69

MutationAssessor

Uncertain

2.5

M;M;M;M

PrimateAI

Pathogenic

0.86

PROVEAN

Pathogenic

-4.8

D;D;D;D

REVEL

Uncertain

0.46

Sift

Uncertain

0.010

D;D;D;D

Sift4G

Uncertain

0.023

D;D;D;D

Polyphen

0.95, 0.97

.;P;.;D

Vest4

0.90

MutPred

0.51

Gain of catalytic residue at A203 (P = 0.001);Gain of catalytic residue at A203 (P = 0.001);Gain of catalytic residue at A203 (P = 0.001);Gain of catalytic residue at A203 (P = 0.001);

MVP

0.41

MPC

2.1

ClinPred

0.98

GERP RS

6.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.58

gMVP

0.92

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over