Genetic Variant ATXN8OS:n.966T>C (chr13-70139247-T-C) – ACMG Classification: Benign (-9 pts)

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NR_002717.3(ATXN8OS):n.758T>C variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000373 in 456,054 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 (no stars).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000039 ( 0 hom. )

Consequence

ATXN8OS
NR_002717.3 non_coding_transcript_exon

Scores

Clinical Significance

Likely benign no assertion criteria provided B:1

Conservation

PhyloP100: 1.64

Publications

0 publications found

Variant links:

Genes affected

ATXN8OS (HGNC:10561): (ATXN8 opposite strand lncRNA) This gene is an antisense transcript to the KLHL1 gene (homolog to the Drosophila KELCH gene); it does not itself appear to be protein coding. A TAC/TGC trinucleotide repeat expansion that is incorporated into this gene transcript, but not the KLHL1 transcript, causes spinocerebellar ataxia type 8. Presumably the expansion interferes with normal antisense function of this transcript. [provided by RefSeq, Oct 2008]

ATXN8OS Gene-Disease associations (from GenCC):

spinocerebellar ataxia type 8
Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics

ATXN8OS links:

ATXN8 (HGNC:32925):

ATXN8 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.88).

BP6

Variant 13-70139247-T-C is Benign according to our data. Variant chr13-70139247-T-C is described in ClinVar as Likely_benign. ClinVar VariationId is 3036411.Status of the report is no_assertion_criteria_provided, 0 stars.

BS2

High AC in GnomAd4 at 5 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NR_002717.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	HGVSc	Effect	Exon Rank
ATXN8OS	NR_002717.3	n.758T>C	non_coding_transcript_exon	Exon 5 of 5
ATXN8OS	NR_185834.1	n.454-8108T>C	intron	N/A
ATXN8OS	NR_185835.1	n.454-8108T>C	intron	N/A

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank
ATXN8OS	ENST00000414504.6	TSL:5	n.966T>C	non_coding_transcript_exon	Exon 5 of 5
ATXN8	ENST00000673087.1		n.185A>G	non_coding_transcript_exon	Exon 1 of 1
ATXN8OS	ENST00000756272.1		n.631T>C	non_coding_transcript_exon	Exon 5 of 5

Frequencies

GnomAD3 genomes

AF:

0.0000329

AC:

AN:

152018

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000395

AC:

AN:

304036

Hom.:

Cov.:

AF XY:

0.0000446

AC XY:

AN XY:

157122

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

8882

American (AMR)

AF:

0.00

AC:

AN:

11756

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

10712

East Asian (EAS)

AF:

0.00

AC:

AN:

26366

South Asian (SAS)

AF:

0.00

AC:

AN:

12616

European-Finnish (FIN)

AF:

0.00

AC:

AN:

23280

Middle Eastern (MID)

AF:

0.00

AC:

AN:

1490

European-Non Finnish (NFE)

AF:

0.0000632

AC:

AN:

189910

Other (OTH)

AF:

0.00

AC:

AN:

19024

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000329

AC:

AN:

152018

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74240

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41404

American (AMR)

AF:

0.00

AC:

AN:

15232

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5168

South Asian (SAS)

AF:

0.00

AC:

AN:

4808

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000735

AC:

AN:

68018

Other (OTH)

AF:

0.00

AC:

AN:

2088

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.545

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<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:

0.000142

Hom.:

Bravo

AF:

0.0000113

ClinVar

ClinVar submissions as Germline

Significance:Likely benign

Revision:no assertion criteria provided

View on ClinVar

Pathogenic

VUS

Benign

Condition

ATXN8OS-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.88

CADD

Benign

3.9

(source)

DANN

Benign

0.73

PhyloP100

1.6

Splicing

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over