rs56268847

Variant names:

• chr14-92071824-T-C
• rs56268847
• NM_004993.6:c.873-771A>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BS1 BS2

The NM_004993.6(ATXN3):​c.873-771A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00259 in 152,338 control chromosomes in the GnomAD database, including 5 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.0026 (5 hom., cov: 32)
• Consequence: ATXN3 NM_004993.6 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.463
• Publications: 3 publications found

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

ENSG00000303901 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.95).
• BS1: Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.00259 (394/152338) while in subpopulation EAS AF = 0.0513 (266/5188). AF 95% confidence interval is 0.0462. There are 5 homozygotes in GnomAd4. There are 229 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High AC in GnomAd4 at 394 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ATXN3	NM_004993.6	c.873-771A>G		intron_variant	Intron 9 of 10	ENST00000644486.2	NP_004984.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ATXN3	ENST00000644486.2	c.873-771A>G		intron_variant	Intron 9 of 10		NM_004993.6	ENSP00000496695.1

Frequencies

GnomAD3 genomes AF: 0.00259 AC: 394 AN: 152220 Hom.: 4 Cov.: 32

Gnomad AFR AF: 0.000338

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000458

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.0512

Gnomad SAS AF: 0.0195

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000103

Gnomad OTH AF: 0.00287

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.00259 AC: 394 AN: 152338 Hom.: 5 Cov.: 32 AF XY: 0.00307 AC XY: 229 AN XY: 74498

African (AFR) AF: 0.000337 AC: 14 AN: 41580

American (AMR) AF: 0.000457 AC: 7 AN: 15302

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.0513 AC: 266 AN: 5188

South Asian (SAS) AF: 0.0191 AC: 92 AN: 4824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10624

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

European-Non Finnish (NFE) AF: 0.000103 AC: 7 AN: 68028

Other (OTH) AF: 0.00378 AC: 8 AN: 2116

Alfa AF: 0.000847 Hom.: 0

Bravo AF: 0.00240

Asia WGS AF: 0.0520 AC: 181 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.95
CADD	Benign	0.78
DANN	Benign	0.65
PhyloP100		-0.46
Mutation Taster		=100/0	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: rs56268847; hg19: chr14-92538168;