chr20-1979580-A-G

Position:

• chr20-1979580-A-G

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_024411.5(PDYN):​c.*743T>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 0.359 in 152,474 control chromosomes in the GnomAD database, including 11,181 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.36 (11174 hom., cov: 32)
  • Exomes 𝑓: 0.18 (7 hom.)
• Consequence: PDYN NM_024411.5 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.264

Genes affected

PDYN (HGNC:8820): (prodynorphin) The protein encoded by this gene is a preproprotein that is proteolytically processed to form the secreted opioid peptides beta-neoendorphin, dynorphin, leu-enkephalin, rimorphin, and leumorphin. These peptides are ligands for the kappa-type of opioid receptor. Dynorphin is involved in modulating responses to several psychoactive substances, including cocaine. Multiple alternatively spliced transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jul 2010]

PDYN-AS1 (HGNC:53462): (PDYN antisense RNA 1)

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BP6: Variant 20-1979580-A-G is Benign according to our data. Variant chr20-1979580-A-G is described in ClinVar as [Benign]. Clinvar id is 337820.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.825 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PDYN	NM_024411.5	c.*743T>C		3_prime_UTR_variant	4/4	ENST00000217305.3
PDYN-AS1	NR_134520.1	n.1252+13237A>G		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PDYN	ENST00000217305.3	c.*743T>C		3_prime_UTR_variant	4/4	1	NM_024411.5	P1
PDYN-AS1	ENST00000651021.1	n.475+13237A>G		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes AF: 0.359 AC: 54546 AN: 151978 Hom.: 11144 Cov.: 32

Gnomad AFR AF: 0.477

Gnomad AMI AF: 0.214

Gnomad AMR AF: 0.336

Gnomad ASJ AF: 0.276

Gnomad EAS AF: 0.847

Gnomad SAS AF: 0.524

Gnomad FIN AF: 0.283

Gnomad MID AF: 0.332

Gnomad NFE AF: 0.262

Gnomad OTH AF: 0.344

GnomAD4 exome AF: 0.184 AC: 69 AN: 376 Hom.: 7 Cov.: 0 AF XY: 0.176 AC XY: 36 AN XY: 204

Gnomad4 AMR exome AF: 0.310

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.500

Gnomad4 NFE exome AF: 0.169

Gnomad4 OTH exome AF: 0.167

GnomAD4 genome AF: 0.359 AC: 54643 AN: 152098 Hom.: 11174 Cov.: 32 AF XY: 0.365 AC XY: 27159 AN XY: 74338

Gnomad4 AFR AF: 0.478

Gnomad4 AMR AF: 0.336

Gnomad4 ASJ AF: 0.276

Gnomad4 EAS AF: 0.846

Gnomad4 SAS AF: 0.524

Gnomad4 FIN AF: 0.283

Gnomad4 NFE AF: 0.262

Gnomad4 OTH AF: 0.351

Alfa AF: 0.305 Hom.: 2075

Bravo AF: 0.369

Asia WGS AF: 0.684 AC: 2378 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Spinocerebellar ataxia type 23 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	-0.90
CADD	Benign	4.6
DANN	Benign	0.63

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: rs910080; hg19: chr20-1960226;