9-32973311-C-G

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_Strong BP6 BS1 BS2

The NM_001195248.2(APTX):c.*187G>C variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00175 in 743,666 control chromosomes in the GnomAD database, including 10 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0054 (9 hom., cov: 32)
  • Exomes 𝑓: 0.00081 (1 hom.)
• Consequence: APTX NM_001195248.2 3_prime_UTR
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:2
• Conservation: PhyloP100: -0.904

Genes affected

APTX (HGNC:15984): (aprataxin) This gene encodes a member of the histidine triad (HIT) superfamily. The encoded protein may play a role in single-stranded DNA repair through its nucleotide-binding activity and its diadenosine polyphosphate hydrolase activity. Mutations in this gene have been associated with ataxia-ocular apraxia. Alternatively spliced transcript variants have been identified for this gene.[provided by RefSeq, Aug 2010]

ACMG classification

Verdict is Benign. Variant got -13 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 9-32973311-C-G is Benign according to our data. Variant chr9-32973311-C-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 366588.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Benign=1, Uncertain_significance=1}.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00542 (825/152252) while in subpopulation AFR AF= 0.0192 (798/41542). AF 95% confidence interval is 0.0181. There are 9 homozygotes in gnomad4. There are 392 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd at 9 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
APTX	NM_001195248.2	c.*187G>C		3_prime_UTR_variant	8/8	ENST00000379817.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
APTX	ENST00000379817.7	c.*187G>C		3_prime_UTR_variant	8/8	1	NM_001195248.2	P1

Frequencies

GnomAD3 genomes AF: 0.00535 AC: 814 AN: 152134 Hom.: 9 Cov.: 32

Gnomad AFR AF: 0.0190

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00157

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: 0.00

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.00112 AC: 152 AN: 135794 Hom.: 1 AF XY: 0.000978 AC XY: 72 AN XY: 73654

Gnomad AFR exome AF: 0.0198

Gnomad AMR exome AF: 0.000772

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000440

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000484

GnomAD4 exome AF: 0.000807 AC: 477 AN: 591414 Hom.: 1 Cov.: 7 AF XY: 0.000684 AC XY: 217 AN XY: 317314

Gnomad4 AFR exome AF: 0.0211

Gnomad4 AMR exome AF: 0.00112

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000475

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000110

Gnomad4 OTH exome AF: 0.00265

GnomAD4 genome AF: 0.00542 AC: 825 AN: 152252 Hom.: 9 Cov.: 32 AF XY: 0.00527 AC XY: 392 AN XY: 74434

Gnomad4 AFR AF: 0.0192

Gnomad4 AMR AF: 0.00157

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00269 Hom.: 0

Bravo AF: 0.00570

Asia WGS AF: 0.00433 AC: 15 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Coenzyme Q10 deficiency, Oculomotor Apraxia Type Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Ataxia, early-onset, with oculomotor apraxia and hypoalbuminemia Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Jun 01, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
Cadd	Benign	0.81
Dann	Benign	0.62

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

Publications

LitVar

Other links and lift over

dbSNP: rs113638548; hg19: chr9-32973309;