14-92071010-CCTGCTGCTGCTG-CCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTG

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP3

The NM_004993.6(ATXN3):c.915_916insCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAG(p.Gln305_Gly306insGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGln) variant causes a conservative inframe insertion change involving the alteration of a non-conserved nucleotide. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. There is a variant allele frequency bias in the population database for this variant (GnomAd4), which may indicate mosaicism or somatic mutations in the reference population data. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.00030 ( 1 hom., cov: 20)

Exomes 𝑓: 0.000045 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

ATXN3
NM_004993.6 conservative_inframe_insertion

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.168

Publications

1 publications found

Variant links:

Genes affected

ATXN3 (HGNC:7106): (ataxin 3) Machado-Joseph disease, also known as spinocerebellar ataxia-3, is an autosomal dominant neurologic disorder. The protein encoded by this gene contains (CAG)n repeats in the coding region, and the expansion of these repeats from the normal 12-44 to 52-86 is one cause of Machado-Joseph disease. There is a negative correlation between the age of onset and CAG repeat numbers. Alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Jul 2016]

ATXN3 Gene-Disease associations (from GenCC):

Machado-Joseph disease
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae)
Machado-Joseph disease type 1
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Machado-Joseph disease type 2
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Machado-Joseph disease type 3
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ATXN3 links:

ENSG00000303901 (HGNC:):

ENSG00000303901 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

BP3

Nonframeshift variant in repetitive region in NM_004993.6

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004993.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
ATXN3	NM_004993.6	MANE Select	c.915_916insCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAG	p.Gln305_Gly306insGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGln	conservative_inframe_insertion	Exon 10 of 11	NP_004984.2
ATXN3	NM_001127696.2		c.870_871insCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAG	p.Gln290_Gly291insGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGln	conservative_inframe_insertion	Exon 9 of 10	NP_001121168.1
ATXN3	NM_001127697.3		c.762_763insCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAG	p.Gln254_Gly255insGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGln	conservative_inframe_insertion	Exon 8 of 9	NP_001121169.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
ATXN3	ENST00000644486.2	MANE Select	c.915_916insCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAG	p.Gln305_Gly306insGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGln	conservative_inframe_insertion	Exon 10 of 11	ENSP00000496695.1
ATXN3	ENST00000532032.5	TSL:1	c.915_916insCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAG	p.Gln305_Gly306insGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGln	conservative_inframe_insertion	Exon 10 of 10	ENSP00000437157.1
ATXN3	ENST00000503767.5	TSL:1	c.870_871insCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAG	p.Gln290_Gly291insGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGln	conservative_inframe_insertion	Exon 9 of 10	ENSP00000426697.1

Frequencies

GnomAD3 genomes

AF:

0.000302

AC:

AN:

142392

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00108

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000208

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:

0.0000151

Gnomad OTH

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.0000449

AC:

AN:

1314518

Hom.:

Cov.:

AF XY:

0.0000487

AC XY:

AN XY:

657274

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.000871

AC:

AN:

27542

American (AMR)

AF:

0.000173

AC:

AN:

40508

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24398

East Asian (EAS)

AF:

0.00

AC:

AN:

37452

South Asian (SAS)

AF:

0.000164

AC:

AN:

79484

European-Finnish (FIN)

AF:

0.00

AC:

AN:

48912

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5148

European-Non Finnish (NFE)

AF:

0.0000110

AC:

AN:

995968

Other (OTH)

AF:

0.0000726

AC:

AN:

55106

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.380

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.000302

AC:

AN:

142502

Hom.:

Cov.:

AF XY:

0.000260

AC XY:

AN XY:

69230

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00107

AC:

AN:

36312

American (AMR)

AF:

0.000208

AC:

AN:

14412

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3412

East Asian (EAS)

AF:

0.00

AC:

AN:

4634

South Asian (SAS)

AF:

0.00

AC:

AN:

4310

European-Finnish (FIN)

AF:

0.00

AC:

AN:

9884

Middle Eastern (MID)

AF:

0.00

AC:

AN:

282

European-Non Finnish (NFE)

AF:

0.0000151

AC:

AN:

66414

Other (OTH)

AF:

0.00

AC:

AN:

1962

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.353

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

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

PhyloP100

-0.17

Mutation Taster

=78/22

polymorphism

(source)

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

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over