chr2-74369194-T-C

Position:

• chr2-74369194-T-C

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BA1

The NM_004082.5(DCTN1):​c.1605A>G​(p.Thr535Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0071 in 1,614,190 control chromosomes in the GnomAD database, including 728 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.038 (381 hom., cov: 32)
  • Exomes 𝑓: 0.0039 (347 hom.)
• Consequence: DCTN1 NM_004082.5 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:9
• Conservation: PhyloP100: -0.200

Genes affected

DCTN1 (HGNC:2711): (dynactin subunit 1) This gene encodes the largest subunit of dynactin, a macromolecular complex consisting of 10 subunits ranging in size from 22 to 150 kD. Dynactin binds to both microtubules and cytoplasmic dynein. Dynactin is involved in a diverse array of cellular functions, including ER-to-Golgi transport, the centripetal movement of lysosomes and endosomes, spindle formation, chromosome movement, nuclear positioning, and axonogenesis. This subunit interacts with dynein intermediate chain by its domains directly binding to dynein and binds to microtubules via a highly conserved glycine-rich cytoskeleton-associated protein (CAP-Gly) domain in its N-terminus. Alternative splicing of this gene results in multiple transcript variants encoding distinct isoforms. Mutations in this gene cause distal hereditary motor neuronopathy type VIIB (HMN7B) which is also known as distal spinal and bulbar muscular atrophy (dSBMA). [provided by RefSeq, Oct 2008]

DCTN1 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.55).
• BP6: Variant 2-74369194-T-C is Benign according to our data. Variant chr2-74369194-T-C is described in ClinVar as [Benign]. Clinvar id is 259233.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-74369194-T-C is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=-0.2 with no splicing effect.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.129 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DCTN1	NM_004082.5	c.1605A>G	p.Thr535Thr	synonymous_variant	15/32	ENST00000628224.3	NP_004073.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DCTN1	ENST00000628224.3	c.1605A>G	p.Thr535Thr	synonymous_variant	15/32	5	NM_004082.5	ENSP00000487279.2

Frequencies

GnomAD3 genomes AF: 0.0379 AC: 5775 AN: 152184 Hom.: 379 Cov.: 32

Gnomad AFR AF: 0.132

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0149

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.000192

Gnomad SAS AF: 0.000827

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.000514

Gnomad OTH AF: 0.0272

GnomAD3 exomes AF: 0.00975 AC: 2452 AN: 251478 Hom.: 162 AF XY: 0.00681 AC XY: 926 AN XY: 135912

Gnomad AFR exome AF: 0.135

Gnomad AMR exome AF: 0.00512

Gnomad ASJ exome AF: 0.000397

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000980

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000457

Gnomad OTH exome AF: 0.00456

GnomAD4 exome AF: 0.00388 AC: 5669 AN: 1461888 Hom.: 347 Cov.: 32 AF XY: 0.00328 AC XY: 2384 AN XY: 727246

Gnomad4 AFR exome AF: 0.135

Gnomad4 AMR exome AF: 0.00666

Gnomad4 ASJ exome AF: 0.000536

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000301

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000272

Gnomad4 OTH exome AF: 0.00813

GnomAD4 genome AF: 0.0381 AC: 5798 AN: 152302 Hom.: 381 Cov.: 32 AF XY: 0.0359 AC XY: 2673 AN XY: 74470

Gnomad4 AFR AF: 0.132

Gnomad4 AMR AF: 0.0149

Gnomad4 ASJ AF: 0.000288

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.000828

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000514

Gnomad4 OTH AF: 0.0270

Alfa AF: 0.0102 Hom.: 136

Bravo AF: 0.0431

Asia WGS AF: 0.00895 AC: 31 AN: 3478

EpiCase AF: 0.000327

EpiControl AF: 0.000533

ClinVar

Significance: Benign

Submissions summary: Benign:9

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:4

Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	May 21, 2020	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -

not provided Benign:2

Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 03, 2015	- -

Neuronopathy, distal hereditary motor, type 7B Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Neuronopathy, distal hereditary motor, type 7B;C1862939:Amyotrophic lateral sclerosis type 1;C1868594:Perry syndrome Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 31, 2024

- -

Perry syndrome Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.55
CADD	Benign	3.7
DANN	Benign	0.72
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs13429423; hg19: chr2-74596321;