9-128239465-C-G

Variant names:

• chr9-128239465-C-G
• rs778321233
• NM_004408.4:c.1443C>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_004408.4(DNM1):​c.1443C>G​(p.Ile481Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,690 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. I481I) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: DNM1 NM_004408.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.553
• Publications: 1 publications found

Genes affected

DNM1 (HGNC:2972): (dynamin 1) This gene encodes a member of the dynamin subfamily of GTP-binding proteins. The encoded protein possesses unique mechanochemical properties used to tubulate and sever membranes, and is involved in clathrin-mediated endocytosis and other vesicular trafficking processes. Actin and other cytoskeletal proteins act as binding partners for the encoded protein, which can also self-assemble leading to stimulation of GTPase activity. More than sixty highly conserved copies of the 3' region of this gene are found elsewhere in the genome, particularly on chromosomes Y and 15. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

DNM1 Gene-Disease associations (from GenCC):

• genetic developmental and epileptic encephalopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• developmental and epileptic encephalopathy, 31A

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• developmental and epileptic encephalopathy, 31B

  Inheritance: AR, AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• Lennox-Gastaut syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• undetermined early-onset epileptic encephalopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DNM1	NM_004408.4	c.1443C>G	p.Ile481Met	missense_variant	Exon 12 of 22	ENST00000372923.8	NP_004399.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DNM1	ENST00000372923.8	c.1443C>G	p.Ile481Met	missense_variant	Exon 12 of 22	1	NM_004408.4	ENSP00000362014.4
DNM1	ENST00000634267.2	c.1443C>G	p.Ile481Met	missense_variant	Exon 12 of 22	5		ENSP00000489096.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461690 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727120

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

American (AMR) AF: 0.00 AC: 0 AN: 44720

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 39692

South Asian (SAS) AF: 0.0000232 AC: 2 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111828

Other (OTH) AF: 0.00 AC: 0 AN: 60392

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Developmental and epileptic encephalopathy, 31A Uncertain:1

-

Neuberg Centre For Genomic Medicine, NCGM

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The observed missense c.1443C>Gp.Ile481Met variant in DNM1 gene has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. The p.Ile481Met variant is absent in gnomAD Exomes database. This variant has not been submitted to the ClinVar database. Multiple lines of computational evidence Polyphen - Probably Damaging, SIFT - Damaging and MutationTaster - Disease causing predict damaging effect on protein structure and function for this variant. The amino acid Ile at position 481 is changed to a Met changing protein sequence and it might alter its composition and physico-chemical properties. For these reasons, this variant has been classified as Uncertain Significance VUS -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.34
BayesDel_addAF	Uncertain	0.096	D
BayesDel_noAF	Benign	-0.10
CADD	Benign	17
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.58	D;.;.;.;.;.;T;.;.
Eigen	Benign	-0.24
Eigen_PC	Benign	-0.34
FATHMM_MKL	Benign	0.48	N
LIST_S2	Uncertain	0.97	D;.;.;D;D;D;D;D;D
M_CAP	Uncertain	0.092	D
MetaRNN	Uncertain	0.66	D;D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.59	T
MutationAssessor	Benign	1.5	L;L;L;L;.;L;.;L;.
PhyloP100		-0.55
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-1.4	N;N;N;N;.;N;.;.;.
REVEL	Uncertain	0.48
Sift	Benign	0.063	T;T;T;T;.;T;.;.;.
Sift4G	Uncertain	0.039	D;D;D;D;D;D;D;D;D
Polyphen		1.0	D;.;D;.;.;D;.;D;.
Vest4		0.68
MutPred		0.59		Gain of phosphorylation at Y485 (P = 0.0824);Gain of phosphorylation at Y485 (P = 0.0824);Gain of phosphorylation at Y485 (P = 0.0824);Gain of phosphorylation at Y485 (P = 0.0824);Gain of phosphorylation at Y485 (P = 0.0824);Gain of phosphorylation at Y485 (P = 0.0824);.;Gain of phosphorylation at Y485 (P = 0.0824);Gain of phosphorylation at Y485 (P = 0.0824);
MVP		0.74
MPC		2.1
ClinPred		0.88	D
GERP RS		-0.61
Varity_R		0.39
gMVP		0.91
Mutation Taster		=64/36	polymorphism

Splicing

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

Other links and lift over

dbSNP: rs778321233; hg19: chr9-131001744;