2-71590280-CTT-CTTT

Variant names:

• chr2-71590280-C-CT
• rs766341386
• NM_001130987.2:c.3571dupT

Variant summary

Our verdict is Pathogenic. The variant received 17 ACMG points: 17P and 0B. PM2_Supporting PM3_Strong PP4_Strong PVS1

This summary comes from the ClinGen Evidence Repository: The NM_003494.4: c.3517dup p.(Ser1173PhefsTer2) variant in DYSF, which is also known as NM_001130987.2: c.3571dup p.(Ser1191PhefsTer2), is a frameshift variant predicted to cause a premature stop codon in biologically relevant exon 32/55, leading to nonsense mediated decay in a gene in which loss of function is an established disease mechanism (PVS1). This variant has been reported in at least six patients with dysferlinopathy (PMID:19528035, 18853459, 27447704, 36983702), including in a homozygous state in two individuals without reported familial consanguinity (1.0 pts, PMID:19528035, 27447704), confirmed in trans with a likely pathogenic or pathogenic variant (NM_003494.4: c.3113G>A p.(Arg1038Gln), 1.0 pt, PMID:36983702), and in unknown phase with a pathogenic variant (NM_003494.4: c.5836_5839del p.(Gln1946TrpfsTer19), 0.5 pts, PMID:36983702) (PM3_Strong). At least one of the patients with this variant and a second presumed diagnostic DYSF variant displayed progressive proximal muscle weakness and absent dysferlin protein expression in skeletal muscle, which is highly specific for DYSF-related LGMD (PP4_Strong; PMID:18853459, 36983702). The filtering allele frequency of this variant is 0.000053899 in gnomAD v4.1.0 exomes (the upper threshold of the 95% CI of 47/1111990 European (non-Finnish) chromosomes), which is less than the ClinGen LGMD VCEP threshold (≤0.0001) (PM2_Supporting). In summary, this variant meets the criteria to be classified as Pathogenic for autosomal recessive limb girdle muscular dystrophy based on the ACMG/AMP criteria applied, as specified by the ClinGen LGMD VCEP (LGMD VCEP specifications version 1.0.0; 05/14/2025): PVS1, PM3_Strong, PP4_Strong, PM2_Supporting. LINK:https://erepo.genome.network/evrepo/ui/classification/CA1706625/MONDO:0015152/180

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000034 (0 hom.)
• Consequence: DYSF NM_001130987.2 frameshift, splice_region
• Clinical Significance: Pathogenic reviewed by expert panel P:7
• Conservation: PhyloP100: -0.115
• Publications: 2 publications found

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 Gene-Disease associations (from GenCC):

• autosomal recessive limb-girdle muscular dystrophy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• neuromuscular disease caused by qualitative or quantitative defects of dysferlin

  Inheritance: AR Classification: DEFINITIVE Submitted by: Myriad Women’s Health
• autosomal recessive limb-girdle muscular dystrophy type 2B

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
• distal myopathy with anterior tibial onset

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• congenital myopathy, Paradas type

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Miyoshi myopathy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 17 ACMG points.

• PVS1: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM3: For more information check the summary or visit ClinGen Evidence Repository.
• PP4: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001130987.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DYSF	NM_001130987.2	MANE Select	c.3571dupT	p.Ser1191PhefsTer2	frameshift splice_region	Exon 32 of 56	NP_001124459.1	O75923-13
	DYSF	NM_003494.4	MANE Plus Clinical	c.3517dupT	p.Ser1173PhefsTer2	frameshift splice_region	Exon 32 of 55	NP_003485.1	O75923-1
	DYSF	NM_001130981.2		c.3568dupT	p.Ser1190PhefsTer2	frameshift splice_region	Exon 32 of 56	NP_001124453.1	O75923-7

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DYSF	ENST00000410020.8	TSL:1 MANE Select	c.3571dupT	p.Ser1191PhefsTer2	frameshift splice_region	Exon 32 of 56	ENSP00000386881.3	O75923-13
	DYSF	ENST00000258104.8	TSL:1 MANE Plus Clinical	c.3517dupT	p.Ser1173PhefsTer2	frameshift splice_region	Exon 32 of 55	ENSP00000258104.3	O75923-1
	DYSF	ENST00000409582.7	TSL:1	c.3568dupT	p.Ser1190PhefsTer2	frameshift splice_region	Exon 32 of 56	ENSP00000386547.3	O75923-7

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152190 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000159 AC: 4 AN: 251460 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: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000264

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.0000342 AC: 50 AN: 1461872 Hom.: 0 Cov.: 31 AF XY: 0.0000261 AC XY: 19 AN XY: 727234

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

American (AMR) AF: 0.0000224 AC: 1 AN: 44724

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

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: 0.0000423 AC: 47 AN: 1111990

Other (OTH) AF: 0.0000331 AC: 2 AN: 60396

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152190 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74338

African (AFR) AF: 0.00 AC: 0 AN: 41452

American (AMR) AF: 0.00 AC: 0 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5190

South Asian (SAS) AF: 0.00 AC: 0 AN: 4832

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10624

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 314

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68030

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.0000434 Hom.: 0

Bravo AF: 0.00000378

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
2	-	-	Autosomal recessive limb-girdle muscular dystrophy type 2B (2)
2	-	-	not provided (2)
1	-	-	Autosomal recessive limb-girdle muscular dystrophy (1)
1	-	-	Miyoshi muscular dystrophy 1 (1)
1	-	-	Neuromuscular disease caused by qualitative or quantitative defects of dysferlin (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.12
Mutation Taster		=0/200	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs766341386; hg19: chr2-71817410;