2-71656237-C-T

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1PM2PP3_Moderate

The NM_001130987.2(DYSF):c.4702C>T(p.Arg1568Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000341 in 1,614,172 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: 𝑓 0.000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000031 ( 0 hom. )

Consequence

DYSF
NM_001130987.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:7

Conservation

PhyloP100: 2.53

Variant links:

Genes affected

DYSF (HGNC:3097): (dysferlin) The protein encoded by this gene belongs to the ferlin family and is a skeletal muscle protein found associated with the sarcolemma. It is involved in muscle contraction and contains C2 domains that play a role in calcium-mediated membrane fusion events, suggesting that it may be involved in membrane regeneration and repair. In addition, the protein encoded by this gene binds caveolin-3, a skeletal muscle membrane protein which is important in the formation of caveolae. Specific mutations in this gene have been shown to cause autosomal recessive limb girdle muscular dystrophy type 2B (LGMD2B) as well as Miyoshi myopathy. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2008]

DYSF links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM1

In a domain C2 6 (size 118) in uniprot entity DYSF_HUMAN there are 26 pathogenic changes around while only 4 benign (87%) in NM_001130987.2

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.894

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DYSF	NM_001130987.2 link	c.4702C>T	p.Arg1568Trp	missense_variant	Exon 43 of 56	ENST00000410020.8	NP_001124459.1	O75923-13
DYSF	NM_003494.4 link	c.4585C>T	p.Arg1529Trp	missense_variant	Exon 42 of 55	ENST00000258104.8	NP_003485.1	O75923-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DYSF	ENST00000410020.8 link	c.4702C>T	p.Arg1568Trp	missense_variant	Exon 43 of 56	1	NM_001130987.2	ENSP00000386881.3		O75923-13
DYSF	ENST00000258104.8 link	c.4585C>T	p.Arg1529Trp	missense_variant	Exon 42 of 55	1	NM_003494.4	ENSP00000258104.3		O75923-1

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152170

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000358

AC:

AN:

251482

Hom.:

AF XY:

0.0000294

AC XY:

AN XY:

135912

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000217

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000308

AC:

AN:

1461884

Hom.:

Cov.:

AF XY:

0.0000358

AC XY:

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.0000896

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000756

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000315

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152288

Hom.:

Cov.:

AF XY:

0.0000671

AC XY:

AN XY:

74468

show subpopulations

Gnomad4 AFR

AF:

0.0000963

Gnomad4 AMR

AF:

0.0000653

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000529

Hom.:

Bravo

AF:

0.0000642

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000412

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Oct 01, 2022

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

DYSF: PM2, PP3 -

May 20, 2021

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Reported in a patient with LGMD in published literature (Guglieri et al., 2008); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 17994539) -

Autosomal recessive limb-girdle muscular dystrophy type 2B

Uncertain:2

Sep 16, 2020

Natera, Inc.

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Sep 08, 2017

Counsyl

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified

Uncertain:1

Dec 15, 2023

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: DYSF c.4585C>T (p.Arg1529Trp) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 3.6e-05 in 251482 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.4585C>T has been reported as a single change in DYSF in one individual affected with Limb-Girdle Muscular Dystrophy,2B, without strong evidence for causality (example, Guglieri_2008). These report(s) do not provide unequivocal conclusions about association of the variant with Limb-Girdle Muscular Dystrophy, Autosomal Recessive. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 17994539). Six submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. All submitters classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

See cases

Uncertain:1

Apr 14, 2021

Laboratorio de Genetica e Diagnostico Molecular, Hospital Israelita Albert Einstein

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG classification criteria: PP3 -

Qualitative or quantitative defects of dysferlin

Uncertain:1

Sep 01, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 1529 of the DYSF protein (p.Arg1529Trp). This variant is present in population databases (rs375698433, gnomAD 0.02%). This missense change has been observed in individual(s) with autosomal recessive limb girdle muscular dystrophy, type 2B (PMID: 17994539). ClinVar contains an entry for this variant (Variation ID: 538620). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt DYSF protein function. 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

Pathogenic

0.82

BayesDel_addAF

Pathogenic

0.24

BayesDel_noAF

Pathogenic

0.37

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.92

.;.;.;.;D;.;.;.;.;.;.

Eigen

Pathogenic

0.84

Eigen_PC

Pathogenic

0.78

FATHMM_MKL

Uncertain

0.93

LIST_S2

Pathogenic

1.0

D;D;D;D;D;D;D;D;D;D;D

M_CAP

Benign

0.079

MetaRNN

Pathogenic

0.89

D;D;D;D;D;D;D;D;D;D;D

MetaSVM

Uncertain

0.75

MutationAssessor

Pathogenic

3.4

.;.;.;.;M;.;.;.;.;.;.

PrimateAI

Uncertain

0.71

PROVEAN

Pathogenic

-6.5

D;D;D;D;D;D;D;D;D;D;D

REVEL

Pathogenic

0.82

Sift

Pathogenic

0.0

D;D;D;D;D;D;D;D;D;D;D

Sift4G

Pathogenic

0.0010

D;D;D;D;D;D;D;D;D;D;D

Polyphen

1.0

D;D;D;D;D;D;D;D;D;D;D

Vest4

0.90

MVP

0.95

MPC

0.66

ClinPred

0.98

GERP RS

5.4

Varity_R

0.68

gMVP

0.86

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over