chr2-74378237-G-A

Variant names:

• chr2-74378237-G-A
• rs535554555
• NM_004082.5:c.42C>T

Variant summary

Our verdict is Benign. The variant received -19 ACMG points: 0P and 19B. BP4_Moderate BP6_Very_Strong BP7 BS1 BS2

The ENST00000628224.3(DCTN1):​c.42C>T​(p.Ser14Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000404 in 1,607,932 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000043 (0 hom.)
• Consequence: DCTN1 ENST00000628224.3 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 0.00400
• Publications: 1 publications found

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 Gene-Disease associations (from GenCC):

• amyotrophic lateral sclerosis type 1

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• neuronopathy, distal hereditary motor, type 7B

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• Perry syndrome

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Ambry Genetics
• amyotrophic lateral sclerosis

  Inheritance: AD Classification: MODERATE Submitted by: ClinGen
• distal hereditary motor neuropathy type 7

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -19 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.43).
• BP6: Variant 2-74378237-G-A is Benign according to our data. Variant chr2-74378237-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 536182.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=0.004 with no splicing effect.
• BS1: Variant frequency is greater than expected in population nfe. GnomAdExome4 allele frequency = 0.0000426 (62/1455562) while in subpopulation NFE AF = 0.0000504 (56/1111968). AF 95% confidence interval is 0.0000398. There are 0 homozygotes in GnomAdExome4. There are 35 alleles in the male GnomAdExome4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High AC in GnomAdExome4 at 62 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000628224.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DCTN1	NM_004082.5	MANE Select	c.42C>T	p.Ser14Ser	synonymous	Exon 2 of 32	NP_004073.2
	DCTN1	NM_001190837.2		c.42C>T	p.Ser14Ser	synonymous	Exon 2 of 31	NP_001177766.1
	DCTN1	NM_001135040.3		c.42C>T	p.Ser14Ser	synonymous	Exon 2 of 28	NP_001128512.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DCTN1	ENST00000628224.3	TSL:5 MANE Select	c.42C>T	p.Ser14Ser	synonymous	Exon 2 of 32	ENSP00000487279.2
	DCTN1	ENST00000361874.8	TSL:1	c.42C>T	p.Ser14Ser	synonymous	Exon 2 of 31	ENSP00000354791.4
	DCTN1	ENST00000409567.7	TSL:1	c.42C>T	p.Ser14Ser	synonymous	Exon 2 of 28	ENSP00000386843.3

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152252 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: 0.0000294

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000326 AC: 8 AN: 245038 AF XY: 0.0000375

Gnomad AFR exome AF: 0.0000630

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000445

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000426 AC: 62 AN: 1455562 Hom.: 0 Cov.: 32 AF XY: 0.0000483 AC XY: 35 AN XY: 724434

African (AFR) AF: 0.0000299 AC: 1 AN: 33470

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: 39698

South Asian (SAS) AF: 0.0000348 AC: 3 AN: 86240

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 47462

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5524

European-Non Finnish (NFE) AF: 0.0000504 AC: 56 AN: 1111968

Other (OTH) AF: 0.0000166 AC: 1 AN: 60340

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152370 Hom.: 0 Cov.: 32 AF XY: 0.0000268 AC XY: 2 AN XY: 74508

African (AFR) AF: 0.0000240 AC: 1 AN: 41594

American (AMR) AF: 0.00 AC: 0 AN: 15310

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

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

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10622

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000294 AC: 2 AN: 68036

Other (OTH) AF: 0.00 AC: 0 AN: 2114

Alfa AF: 0.000108 Hom.: 0

Bravo AF: 0.0000302

EpiCase AF: 0.0000545

EpiControl AF: 0.0000593

ClinVar

ClinVar submissions as Germline

Significance: Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	1	Inborn genetic diseases (1)
-	-	1	Neuronopathy, distal hereditary motor, type 7B;C1862939:Amyotrophic lateral sclerosis type 1;C1868594:Perry syndrome (1)
-	-	1	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.43
CADD	Benign	1.8
DANN	Benign	0.83
PhyloP100		0.0040
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Mutation Taster		=300/0	polymorphism

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: rs535554555; hg19: chr2-74605364;