6-16327684-ATGCTGCTGCTGCTGCTGCTGCTGCTGCTGC-ATGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGC

Position:

• chr6-16327684-ATGCTGCTGCTGCTGCTGCTGCTGCTGCTGC-ATGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGCTGC

Variant summary

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

The NM_001128164.2(ATXN1):​c.626_627insGCAGCAGCAGCAGCAGCAGCAGCA​(p.Gln201_Gln208dup) 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 0.00038 (0 hom., cov: 20)
  • Exomes 𝑓: 0.00033 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: ATXN1 NM_001128164.2 inframe_insertion
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.106

Genes affected

ATXN1 (HGNC:10548): (ataxin 1) The autosomal dominant cerebellar ataxias (ADCA) are a heterogeneous group of neurodegenerative disorders characterized by progressive degeneration of the cerebellum, brain stem and spinal cord. Clinically, ADCA has been divided into three groups: ADCA types I-III. ADCAI is genetically heterogeneous, with five genetic loci, designated spinocerebellar ataxia (SCA) 1, 2, 3, 4 and 6, being assigned to five different chromosomes. ADCAII, which always presents with retinal degeneration (SCA7), and ADCAIII often referred to as the `pure' cerebellar syndrome (SCA5), are most likely homogeneous disorders. Several SCA genes have been cloned and shown to contain CAG repeats in their coding regions. ADCA is caused by the expansion of the CAG repeats, producing an elongated polyglutamine tract in the corresponding protein. The expanded repeats are variable in size and unstable, usually increasing in size when transmitted to successive generations. The function of the ataxins is not known. This locus has been mapped to chromosome 6, and it has been determined that the diseased allele contains 40-83 CAG repeats, compared to 6-39 in the normal allele, and is associated with spinocerebellar ataxia type 1 (SCA1). Alternative splicing results in multiple transcript variants, with one variant encoding multiple distinct proteins, ATXN1 and Alt-ATXN1, due to the use of overlapping alternate reading frames. [provided by RefSeq, Nov 2017]

ACMG classification

Verdict is Likely_benign. Variant got -4 ACMG points.

• BS2: High AC in GnomAd4 at 51 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ATXN1	NM_001128164.2	c.626_627insGCAGCAGCAGCAGCAGCAGCAGCA	p.Gln201_Gln208dup	inframe_insertion	7/8	ENST00000436367.6	NP_001121636.1
ATXN1	NM_000332.4	c.626_627insGCAGCAGCAGCAGCAGCAGCAGCA	p.Gln201_Gln208dup	inframe_insertion	8/9		NP_000323.2
ATXN1	NM_001357857.2	c.*39_*40insGCAGCAGCAGCAGCAGCAGCAGCA		3_prime_UTR_variant	8/9		NP_001344786.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ATXN1	ENST00000436367.6	c.626_627insGCAGCAGCAGCAGCAGCAGCAGCA	p.Gln201_Gln208dup	inframe_insertion	7/8	1	NM_001128164.2	ENSP00000416360	P1
ATXN1	ENST00000244769.8	c.626_627insGCAGCAGCAGCAGCAGCAGCAGCA	p.Gln201_Gln208dup	inframe_insertion	8/9	1		ENSP00000244769	P1
ATXN1	ENST00000642969.1			downstream_gene_variant				ENSP00000493530

Frequencies

GnomAD3 genomes AF: 0.000379 AC: 51 AN: 134640 Hom.: 0 Cov.: 20

Gnomad AFR AF: 0.000244

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000827

Gnomad ASJ AF: 0.000610

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000102

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000449

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.000326 AC: 437 AN: 1338958 Hom.: 0 Cov.: 32 AF XY: 0.000295 AC XY: 196 AN XY: 665218

Gnomad4 AFR exome AF: 0.000226

Gnomad4 AMR exome AF: 0.000197

Gnomad4 ASJ exome AF: 0.00101

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000188

Gnomad4 FIN exome AF: 0.0000746

Gnomad4 NFE exome AF: 0.000348

Gnomad4 OTH exome AF: 0.000327

GnomAD4 genome AF: 0.000379 AC: 51 AN: 134738 Hom.: 0 Cov.: 20 AF XY: 0.000458 AC XY: 30 AN XY: 65504

Gnomad4 AFR AF: 0.000244

Gnomad4 AMR AF: 0.000826

Gnomad4 ASJ AF: 0.000610

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.000102

Gnomad4 NFE AF: 0.000449

Gnomad4 OTH AF: 0.00

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: rs193922926; hg19: chr6-16327915;