chr12-6935675-C-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -10 ACMG points: 0P and 10B. BP4_StrongBP6BP7BS2

The NM_001940.4(ATN1):c.408C>T(p.Tyr136Tyr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00738 in 1,614,012 control chromosomes in the GnomAD database, including 64 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0048 ( 4 hom., cov: 31)

Exomes 𝑓: 0.0076 ( 60 hom. )

Consequence

ATN1
NM_001940.4 synonymous

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:2

Conservation

PhyloP100: 0.987

Publications

2 publications found

Variant links:

Genes affected

ATN1 (HGNC:3033): (atrophin 1) Dentatorubral pallidoluysian atrophy (DRPLA) is a rare neurodegenerative disorder characterized by cerebellar ataxia, myoclonic epilepsy, choreoathetosis, and dementia. The disorder is related to the expansion from 7-35 copies to 49-93 copies of a trinucleotide repeat (CAG/CAA) within this gene. The encoded protein includes a serine repeat and a region of alternating acidic and basic amino acids, as well as the variable glutamine repeat. Alternative splicing results in two transcripts variants that encode the same protein. [provided by RefSeq, Jul 2016]

ATN1 Gene-Disease associations (from GenCC):

congenital hypotonia, epilepsy, developmental delay, and digital anomalies
Inheritance: AD Classification: STRONG, MODERATE Submitted by: G2P, Illumina, Ambry Genetics, Labcorp Genetics (formerly Invitae)
dentatorubral-pallidoluysian atrophy
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)

ATN1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -10 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.65).

BP6

Variant 12-6935675-C-T is Benign according to our data. Variant chr12-6935675-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 210378.

BP7

Synonymous conserved (PhyloP=0.987 with no splicing effect.

BS2

High AC in GnomAd4 at 738 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001940.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
ATN1	NM_001940.4	MANE Select	c.408C>T	p.Tyr136Tyr	synonymous	Exon 5 of 10	NP_001931.2
ATN1	NM_001007026.2		c.408C>T	p.Tyr136Tyr	synonymous	Exon 5 of 10	NP_001007027.1
ATN1	NM_001424176.1		c.408C>T	p.Tyr136Tyr	synonymous	Exon 5 of 10	NP_001411105.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ATN1	ENST00000396684.3	TSL:1 MANE Select	c.408C>T	p.Tyr136Tyr	synonymous	Exon 5 of 10	ENSP00000379915.2
	ATN1	ENST00000356654.8	TSL:1	c.408C>T	p.Tyr136Tyr	synonymous	Exon 5 of 10	ENSP00000349076.3

Frequencies

GnomAD3 genomes

AF:

0.00485

AC:

738

AN:

152110

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00184

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00445

Gnomad ASJ

AF:

0.00144

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00132

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00828

Gnomad OTH

AF:

0.00527

GnomAD2 exomes

AF:

0.00436

AC:

1095

AN:

251382

AF XY:

0.00414

show subpopulations

Gnomad AFR exome

AF:

0.00154

Gnomad AMR exome

AF:

0.00344

Gnomad ASJ exome

AF:

0.00218

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00180

Gnomad NFE exome

AF:

0.00754

Gnomad OTH exome

AF:

0.00538

GnomAD4 exome

AF:

0.00764

AC:

11166

AN:

1461784

Hom.:

Cov.:

AF XY:

0.00737

AC XY:

5363

AN XY:

727214

show subpopulations

African (AFR)

AF:

0.00152

AC:

AN:

33480

American (AMR)

AF:

0.00333

AC:

149

AN:

44710

Ashkenazi Jewish (ASJ)

AF:

0.00253

AC:

AN:

26128

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00172

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.000694

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.00935

AC:

10396

AN:

1111942

Other (OTH)

AF:

0.00674

AC:

407

AN:

60384

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.477

Heterozygous variant carriers

663

1326

1988

2651

3314

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

402

804

1206

1608

2010

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00485

AC:

738

AN:

152228

Hom.:

Cov.:

AF XY:

0.00458

AC XY:

341

AN XY:

74450

show subpopulations

African (AFR)

AF:

0.00183

AC:

AN:

41524

American (AMR)

AF:

0.00444

AC:

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.00144

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5166

South Asian (SAS)

AF:

0.000207

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00132

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00828

AC:

563

AN:

67994

Other (OTH)

AF:

0.00521

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.504

Heterozygous variant carriers

112

149

186

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00669

Hom.:

Bravo

AF:

0.00480

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00812

EpiControl

AF:

0.00872

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:2

Breakthrough Genomics, Breakthrough Genomics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:not provided

Aug 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

ATN1: BP4, BP7, BS2

Dec 22, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

not specified

Uncertain:1

Jun 27, 2014

Genetic Services Laboratory, University of Chicago

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.65

CADD

Benign

9.3

(source)

DANN

Benign

0.86

PhyloP100

0.99

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over