14-92071010-CCTGCTG-CCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTG

Position:

• chr14-92071010-CCTGCTG-CCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTG

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_004993.6(ATXN3):​c.915_916insCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAG​(p.Gln305_Gly306insGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGln) variant causes a inframe insertion change involving the alteration of a non-conserved nucleotide. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0044 (41 hom., cov: 20)
  • Exomes 𝑓: 0.00023 (2 hom.)
  • Failed GnomAD Quality Control
• Consequence: ATXN3 NM_004993.6 inframe_insertion
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.168

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]

ACMG classification

Verdict is Likely_benign. Variant got -4 ACMG points.

• BS2: High AC in GnomAd4 at 629 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ATXN3	NM_004993.6	c.915_916insCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAG	p.Gln305_Gly306insGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGln	inframe_insertion	10/11	ENST00000644486.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ATXN3	ENST00000644486.2	c.915_916insCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAGCAG	p.Gln305_Gly306insGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGlnGln	inframe_insertion	10/11		NM_004993.6	P1

Frequencies

GnomAD3 genomes AF: 0.00442 AC: 629 AN: 142304 Hom.: 40 Cov.: 20

Gnomad AFR AF: 0.0150

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00375

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000464

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00658

Gnomad NFE AF: 0.000376

Gnomad OTH AF: 0.00309

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.000229 AC: 301 AN: 1313936 Hom.: 2 Cov.: 92 AF XY: 0.000184 AC XY: 121 AN XY: 656994

Gnomad4 AFR exome AF: 0.00631

Gnomad4 AMR exome AF: 0.000371

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000126

Gnomad4 FIN exome AF: 0.0000409

Gnomad4 NFE exome AF: 0.0000693

Gnomad4 OTH exome AF: 0.000581

GnomAD4 genome AF: 0.00442 AC: 629 AN: 142414 Hom.: 41 Cov.: 20 AF XY: 0.00425 AC XY: 294 AN XY: 69178

Gnomad4 AFR AF: 0.0149

Gnomad4 AMR AF: 0.00368

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000464

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000376

Gnomad4 OTH AF: 0.00306

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs193922928; hg19: chr14-92537354;