chr22-20859103-C-G

Position:

chr22-20859103-C-G

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_004782.4(SNAP29):c.-8C>G variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00193 in 1,594,494 control chromosomes in the GnomAD database, including 48 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.010 ( 22 hom., cov: 33)

Exomes 𝑓: 0.0011 ( 26 hom. )

Consequence

SNAP29
NM_004782.4 5_prime_UTR

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: -0.205

Variant links:

Genes affected

SNAP29 (HGNC:11133): (synaptosome associated protein 29) This gene, a member of the SNAP25 gene family, encodes a protein involved in multiple membrane trafficking steps. Two other members of this gene family, SNAP23 and SNAP25, encode proteins that bind a syntaxin protein and mediate synaptic vesicle membrane docking and fusion to the plasma membrane. The protein encoded by this gene binds tightly to multiple syntaxins and is localized to intracellular membrane structures rather than to the plasma membrane. While the protein is mostly membrane-bound, a significant fraction of it is found free in the cytoplasm. Use of multiple polyadenylation sites has been noted for this gene. [provided by RefSeq, Jul 2008]

SNAP29 links:

PI4KA (HGNC:8983): (phosphatidylinositol 4-kinase alpha) This gene encodes a phosphatidylinositol (PI) 4-kinase which catalyzes the first committed step in the biosynthesis of phosphatidylinositol 4,5-bisphosphate. The mammalian PI 4-kinases have been classified into two types, II and III, based on their molecular mass, and modulation by detergent and adenosine. The protein encoded by this gene is a type III enzyme that is not inhibited by adenosine. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Apr 2018]

PI4KA links:

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.69).

BP6

Variant 22-20859103-C-G is Benign according to our data. Variant chr22-20859103-C-G is described in ClinVar as [Likely_benign]. Clinvar id is 340827.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr22-20859103-C-G is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0103 (1567/152292) while in subpopulation AFR AF= 0.0352 (1464/41562). AF 95% confidence interval is 0.0337. There are 22 homozygotes in gnomad4. There are 762 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 22 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SNAP29	NM_004782.4 linkuse as main transcript	c.-8C>G		5_prime_UTR_variant	1/5	ENST00000215730.12

Ensembl

Gene	Transcript	HGVSc	Effect	#exon/exons	TSL	MANE	Appris
SNAP29	ENST00000215730.12 linkuse as main transcript	c.-8C>G	5_prime_UTR_variant	1/5	1	NM_004782.4	P1
PI4KA	ENST00000449120.1 linkuse as main transcript	c.-19+20G>C	intron_variant		4
SNAP29	ENST00000490458.1 linkuse as main transcript	n.23C>G	non_coding_transcript_exon_variant	1/2	2

Frequencies

GnomAD3 genomes

AF:

0.0103

AC:

1562

AN:

152174

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0352

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00491

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000132

Gnomad OTH

AF:

0.00812

GnomAD3 exomes

AF:

0.00236

AC:

530

AN:

224710

Hom.:

AF XY:

0.00173

AC XY:

214

AN XY:

123438

show subpopulations

Gnomad AFR exome

AF:

0.0345

Gnomad AMR exome

AF:

0.00163

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000104

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000616

Gnomad OTH exome

AF:

0.000732

GnomAD4 exome

AF:

0.00105

AC:

1517

AN:

1442202

Hom.:

Cov.:

AF XY:

0.000885

AC XY:

635

AN XY:

717574

show subpopulations

Gnomad4 AFR exome

AF:

0.0360

Gnomad4 AMR exome

AF:

0.00212

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000118

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000519

Gnomad4 OTH exome

AF:

0.00258

GnomAD4 genome

AF:

0.0103

AC:

1567

AN:

152292

Hom.:

Cov.:

AF XY:

0.0102

AC XY:

762

AN XY:

74468

show subpopulations

Gnomad4 AFR

AF:

0.0352

Gnomad4 AMR

AF:

0.00490

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000414

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000132

Gnomad4 OTH

AF:

0.00803

Alfa

AF:

0.00270

Hom.:

Bravo

AF:

0.0113

Asia WGS

AF:

0.000867

AC:

AN:

3474

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Feb 02, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Dec 01, 2016	- -

not provided

Benign:2

Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Aug 07, 2018	- -

CEDNIK syndrome

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

-0.69

CADD

Benign

3.9

DANN

Benign

0.55

RBP_binding_hub_radar

0.92

RBP_regulation_power_radar

3.1

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over