2-71553148-G-A

Position:

• chr2-71553148-G-A

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6 BP7 BS1 BS2

The NM_001130987.2(DYSF):​c.1944G>A​(p.Pro648=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00166 in 1,614,074 control chromosomes in the GnomAD database, including 29 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. P648P) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0075 (13 hom., cov: 33)
  • Exomes 𝑓: 0.0011 (16 hom.)
• Consequence: DYSF NM_001130987.2 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:6
• Conservation: PhyloP100: -4.24

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]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.58).
• BP6: Variant 2-71553148-G-A is Benign according to our data. Variant chr2-71553148-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 94283.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=3, Benign=4}. Variant chr2-71553148-G-A is described in Lovd as [Benign]. Variant chr2-71553148-G-A is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=-4.24 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00747 (1137/152268) while in subpopulation AFR AF= 0.0246 (1021/41548). AF 95% confidence interval is 0.0233. There are 13 homozygotes in gnomad4. There are 548 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 13 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DYSF	NM_001130987.2	c.1944G>A	p.Pro648=	synonymous_variant	20/56	ENST00000410020.8
DYSF	NM_003494.4	c.1890G>A	p.Pro630=	synonymous_variant	20/55	ENST00000258104.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DYSF	ENST00000410020.8	c.1944G>A	p.Pro648=	synonymous_variant	20/56	1	NM_001130987.2	A1
DYSF	ENST00000258104.8	c.1890G>A	p.Pro630=	synonymous_variant	20/55	1	NM_003494.4	A1

Frequencies

GnomAD3 genomes AF: 0.00745 AC: 1133 AN: 152150 Hom.: 13 Cov.: 33

Gnomad AFR AF: 0.0245

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00491

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00949

Gnomad NFE AF: 0.000382

Gnomad OTH AF: 0.00574

GnomAD3 exomes AF: 0.00234 AC: 587 AN: 251314 Hom.: 6 AF XY: 0.00200 AC XY: 272 AN XY: 135862

Gnomad AFR exome AF: 0.0262

Gnomad AMR exome AF: 0.00280

Gnomad ASJ exome AF: 0.000198

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000653

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000440

Gnomad OTH exome AF: 0.00179

GnomAD4 exome AF: 0.00105 AC: 1539 AN: 1461806 Hom.: 16 Cov.: 34 AF XY: 0.000990 AC XY: 720 AN XY: 727196

Gnomad4 AFR exome AF: 0.0243

Gnomad4 AMR exome AF: 0.00273

Gnomad4 ASJ exome AF: 0.0000383

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000696

Gnomad4 FIN exome AF: 0.0000375

Gnomad4 NFE exome AF: 0.000393

Gnomad4 OTH exome AF: 0.00195

GnomAD4 genome AF: 0.00747 AC: 1137 AN: 152268 Hom.: 13 Cov.: 33 AF XY: 0.00736 AC XY: 548 AN XY: 74462

Gnomad4 AFR AF: 0.0246

Gnomad4 AMR AF: 0.00491

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000382

Gnomad4 OTH AF: 0.00568

Alfa AF: 0.00399 Hom.: 3

Bravo AF: 0.00878

Asia WGS AF: 0.00231 AC: 8 AN: 3478

EpiCase AF: 0.000600

EpiControl AF: 0.00101

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3 Benign:6

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Benign:4

Benign, criteria provided, single submitter	clinical testing	GeneDx	Dec 07, 2016	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Likely benign, no assertion criteria provided	clinical testing	Genetic Services Laboratory, University of Chicago	-	Likely benign based on allele frequency in 1000 Genomes Project or ESP global frequency and its presence in a patient with a rare or unrelated disease phenotype. NOT Sanger confirmed. -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jul 15, 2013	- -

Qualitative or quantitative defects of dysferlin Uncertain:1 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -

Limb-girdle muscular dystrophy, recessive Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Miyoshi myopathy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Autosomal recessive limb-girdle muscular dystrophy type 2B Benign:1

Benign, no assertion criteria provided

clinical testing

Natera, Inc.

Sep 16, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.58
CADD	Benign	0.77
DANN	Benign	0.65

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs115849497; hg19: chr2-71780278;