chr19-10793832-C-T

Variant names:

• chr19-10793832-C-T
• rs121909090
• NM_001005361.3:c.1105C>T

Variant summary

Our verdict is Pathogenic. The variant received 15 ACMG points: 15P and 0B. PM2_Supporting PS4 PP1_Strong PP2 PM5 PS3_Supporting PM6

This summary comes from the ClinGen Evidence Repository: The c.1105C>T variant in DNM2 is a missense variant predicted to cause substitution of arginine by tryptophan at amino acid 369 (p.Arg369Trp). The highest population minor allele frequency in gnomAD v4.1 is 0.00001335 (1/74912 alleles) in the African/African American population, which is lower than the ClinGen Congenital Myopathies VCEP threshold for PM2_Supporting, meeting this criterion (PM2_Supporting). DNM2, in which the variant was identified, is defined by the ClinGen Congenital Myopathies VCEP as a gene that has a low rate of benign missense variation and where pathogenic missense variants are a common mechanism of disease (PP2). The computational predictor REVEL gives a score of 0.683, which is neither above nor below the thresholds predicting a damaging or benign impact on RYR1 function. This variant has been reported in at least 11 probands from 6 families meeting phenotypic criteria distal muscular weakness and ptosis, which is highly specific for centronuclear myopathy (PS4; PMIDs: 16227997, 20817456, 22613877, 25492887, 25501959, 28676641). The variant has been reported to segregate with centronuclear myopathy in 5 affected family members from 2 families (PP1_Strong; PMIDs: 16227997, 22613877). Two different missense variants (c.1106G>T, p.Arg369Leu; p.Arg369Gln, c.1106G>A) in the same codon have been classified as likely pathogenic and pathogenic, respectively, for autosomal dominant centronuclear myopathy by the ClinGen Congenital Myopathies VCEP (and autosomal dominant Charcot-Marie-Tooth disease by the ClinGen Charcot-Marie-Tooth disease VCEP) (PM5). This variant has been identified as a de novo occurrence with unconfirmed parental relationships in 1 individual with centronuclear myopathy (PM6; PMIDs: 16227997). A cell culture of human myoblasts from quadriceps showed impaired actin development, indicating that this variant impacts protein function (PMID:28676641; PS3_Supporting). In summary, this variant meets the criteria to be classified as pathogenic for autosomal dominant centronuclear myopathy based on the ACMG/AMP criteria applied, as specified by the ClinGen Congenital Myopathies VCEP: PS4, PP1_Strong, PM5, PM6, PM2_Supporting, PP2, PS3_Supporting. (ClinGen Congenital Myopathies VCEP specifications version 1; 8/7/24) LINK:https://erepo.genome.network/evrepo/ui/classification/CA118658/MONDO:0018947/148

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: DNM2 NM_001005361.3 missense
• Clinical Significance: Pathogenic reviewed by expert panel P:10 U:1
• Conservation: PhyloP100: 0.554
• Publications: 27 publications found

Genes affected

DNM2 (HGNC:2974): (dynamin 2) Dynamins represent one of the subfamilies of GTP-binding proteins. These proteins share considerable sequence similarity over the N-terminal portion of the molecule, which contains the GTPase domain. Dynamins are associated with microtubules. They have been implicated in cell processes such as endocytosis and cell motility, and in alterations of the membrane that accompany certain activities such as bone resorption by osteoclasts. Dynamins bind many proteins that bind actin and other cytoskeletal proteins. Dynamins can also self-assemble, a process that stimulates GTPase activity. Five alternatively spliced transcripts encoding different proteins have been described. Additional alternatively spliced transcripts may exist, but their full-length nature has not been determined. [provided by RefSeq, Jun 2010]

DNM2 Gene-Disease associations (from GenCC):

• autosomal dominant centronuclear myopathy

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Ambry Genetics, Orphanet
• Charcot-Marie-Tooth disease

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• Charcot-Marie-Tooth disease dominant intermediate B

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics
• autosomal dominant Charcot-Marie-Tooth disease type 2M

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• fetal akinesia-cerebral and retinal hemorrhage syndrome

  Inheritance: AR Classification: SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet
• hereditary spastic paraplegia

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Specifications for DNM2 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Pathogenic. The variant received 15 ACMG points.

• PS3: For more information check the summary or visit ClinGen Evidence Repository.
• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM5: For more information check the summary or visit ClinGen Evidence Repository.
• PM6: For more information check the summary or visit ClinGen Evidence Repository.
• PP1: For more information check the summary or visit ClinGen Evidence Repository.
• PP2: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001005361.3. 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
	DNM2	NM_001005361.3	MANE Select	c.1105C>T	p.Arg369Trp	missense	Exon 8 of 21	NP_001005361.1	P50570-4
	DNM2	NM_001005360.3		c.1105C>T	p.Arg369Trp	missense	Exon 8 of 21	NP_001005360.1	P50570-1
	DNM2	NM_001190716.2		c.1105C>T	p.Arg369Trp	missense	Exon 8 of 21	NP_001177645.1	P50570-5

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DNM2	ENST00000389253.9	TSL:5 MANE Select	c.1105C>T	p.Arg369Trp	missense	Exon 8 of 21	ENSP00000373905.4	P50570-4
	DNM2	ENST00000355667.11	TSL:1	c.1105C>T	p.Arg369Trp	missense	Exon 8 of 21	ENSP00000347890.6	P50570-1
	DNM2	ENST00000585892.5	TSL:1	c.1105C>T	p.Arg369Trp	missense	Exon 8 of 21	ENSP00000468734.1	P50570-5

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152170 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461892 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727246

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

American (AMR) AF: 0.00 AC: 0 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: 8.99e-7 AC: 1 AN: 1112010

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152170 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74338

African (AFR) AF: 0.0000241 AC: 1 AN: 41432

American (AMR) AF: 0.00 AC: 0 AN: 15280

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 5184

South Asian (SAS) AF: 0.00 AC: 0 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10610

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68044

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

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
2	1	-	Charcot-Marie-Tooth disease dominant intermediate B (3)
2	-	-	Autosomal dominant centronuclear myopathy (2)
2	-	-	Centronuclear myopathy (2)
2	-	-	not provided (2)
1	-	-	Charcot-Marie-Tooth disease (1)
1	-	-	Limb-girdle muscular dystrophy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.22
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.91	D
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.49
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Uncertain	0.092	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Uncertain	0.19	D
MutationAssessor	Uncertain	2.6	M
PhyloP100		0.55
PrimateAI	Pathogenic	0.92	D
PROVEAN	Pathogenic	-7.3	D
REVEL	Pathogenic	0.68
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.0080	D
Polyphen		1.0	D
Vest4		0.90
MutPred		0.91		Loss of methylation at R369 (P = 0.0439)
MVP		0.94
MPC		2.2
ClinPred		0.99	D
GERP RS		3.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.72
gMVP		0.89
Mutation Taster		=0/100	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: rs121909090; hg19: chr19-10904508;