17-78992074-C-T

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BS1 BS2

The NM_001159773.2(CANT1):c.*1476G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00341 in 232,066 control chromosomes in the GnomAD database, including 6 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.0047 (6 hom., cov: 33)
  • Exomes 𝑓: 0.00099 (0 hom.)
• Consequence: CANT1 NM_001159773.2 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.628

Genes affected

CANT1 (HGNC:19721): (calcium activated nucleotidase 1) This protein encoded by this gene belongs to the apyrase family. It functions as a calcium-dependent nucleotidase with a preference for UDP. Mutations in this gene are associated with Desbuquois dysplasia with hand anomalies. Alternatively spliced transcript variants have been noted for this gene.[provided by RefSeq, Mar 2010]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BP6: Variant 17-78992074-C-T is Benign according to our data. Variant chr17-78992074-C-T is described in ClinVar as [Benign]. Clinvar id is 325668.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00467 (712/152308) while in subpopulation AFR AF= 0.0159 (660/41558). AF 95% confidence interval is 0.0149. There are 6 homozygotes in gnomad4. There are 354 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd at 6 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CANT1	NM_001159773.2	c.*1476G>A		3_prime_UTR_variant	5/5	ENST00000392446.10
CANT1	NM_001159772.2	c.*1476G>A		3_prime_UTR_variant	6/6
CANT1	NM_138793.4	c.*1476G>A		3_prime_UTR_variant	4/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CANT1	ENST00000392446.10	c.*1476G>A		3_prime_UTR_variant	5/5	1	NM_001159773.2	P1
CANT1	ENST00000302345.6	c.*1476G>A		3_prime_UTR_variant	4/4	2		P1
CANT1	ENST00000620915.4	c.*1476G>A		3_prime_UTR_variant	4/4	5		P1
CANT1	ENST00000592228.1	c.*271G>A		3_prime_UTR_variant, NMD_transcript_variant	4/4	5

Frequencies

GnomAD3 genomes AF: 0.00470 AC: 715 AN: 152190 Hom.: 6 Cov.: 33

Gnomad AFR AF: 0.0160

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00235

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000132

Gnomad OTH AF: 0.00382

GnomAD4 exome AF: 0.000990 AC: 79 AN: 79758 Hom.: 0 Cov.: 0 AF XY: 0.000899 AC XY: 33 AN XY: 36706

Gnomad4 AFR exome AF: 0.0147

Gnomad4 AMR exome AF: 0.00205

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000609

Gnomad4 OTH exome AF: 0.00195

GnomAD4 genome AF: 0.00467 AC: 712 AN: 152308 Hom.: 6 Cov.: 33 AF XY: 0.00475 AC XY: 354 AN XY: 74468

Gnomad4 AFR AF: 0.0159

Gnomad4 AMR AF: 0.00229

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000132

Gnomad4 OTH AF: 0.00378

Alfa AF: 0.00423 Hom.: 0

Bravo AF: 0.00550

Asia WGS AF: 0.000577 AC: 2 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Desbuquois dysplasia 1 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
Cadd	Benign	6.1
Dann	Benign	0.72

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: rs73999357; hg19: chr17-76988156;