rs754691182

chr19-10829241-C-Achr19-10829241-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 5P and 2B. PM1 PM2 PP2 BP4_Moderate

The NM_001005361.3(DNM2):c.2264C>A(p.Thr755Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T755I) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: DNM2 NM_001005361.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.56

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM1: In a modified_residue Phosphothreonine (size 0) in uniprot entity DYN2_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, DNM2
• BP4: Computational evidence support a benign effect (MetaRNN=0.20644867).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DNM2	NM_001005361.3	c.2264C>A	p.Thr755Asn	missense_variant	19/21	ENST00000389253.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DNM2	ENST00000389253.9	c.2264C>A	p.Thr755Asn	missense_variant	19/21	5	NM_001005361.3	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Charcot-Marie-Tooth disease dominant intermediate B Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Apr 29, 2018

This sequence change replaces threonine with asparagine at codon 755 of the DNM2 protein (p.Thr755Asn). The threonine residue is moderately conserved and there is a small physicochemical difference between threonine and asparagine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with DNM2-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. 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	Benign	0.079
BayesDel_addAF	Uncertain	0.054	T
BayesDel_noAF	Benign	-0.16
Cadd	Benign	23
Dann	Uncertain	0.98
Eigen	Benign	-0.39
Eigen_PC	Benign	-0.32
FATHMM_MKL	Uncertain	0.77	D
LIST_S2	Uncertain	0.88	D;D;D;D;D
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.21	T;T;T;T;T
MetaSVM	Uncertain	0.42	D
MutationAssessor	Uncertain	2.0	M;.;M;M;.
MutationTaster	Benign	0.76	D;D;D;D;D;D
PrimateAI	Uncertain	0.50	T
Sift4G	Benign	0.12	T;T;T;T;T
Polyphen		0.84, 0.0010	.;P;.;B;.
Vest4		0.23
MutPred		0.28		Gain of relative solvent accessibility (P = 0.0215);.;Gain of relative solvent accessibility (P = 0.0215);Gain of relative solvent accessibility (P = 0.0215);.;
MVP		0.77
MPC		0.35
ClinPred		0.43	T
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.16
gMVP		0.23

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

Other links and lift over

dbSNP: rs754691182; hg19: chr19-10939917;