chr22-20859079-C-G

Position:

chr22-20859079-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.-32C>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 0.00124 in 1,548,512 control chromosomes in the GnomAD database, including 25 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0065 ( 14 hom., cov: 32)

Exomes 𝑓: 0.00066 ( 11 hom. )

Consequence

SNAP29
NM_004782.4 5_prime_UTR

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3

Conservation

PhyloP100: 0.310

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=-0.68).

BP6

Variant 22-20859079-C-G is Benign according to our data. Variant chr22-20859079-C-G is described in ClinVar as [Likely_benign]. Clinvar id is 340825.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00655 (997/152292) while in subpopulation AFR AF= 0.0228 (946/41570). AF 95% confidence interval is 0.0216. There are 14 homozygotes in gnomad4. There are 471 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 14 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SNAP29	NM_004782.4 linkuse as main transcript	c.-32C>G		5_prime_UTR_variant	1/5	ENST00000215730.12	NP_004773.1

Ensembl

Gene	Transcript	HGVSc	Effect	#exon/exons	TSL	MANE	Protein	Appris
SNAP29	ENST00000215730.12 linkuse as main transcript	c.-32C>G	5_prime_UTR_variant	1/5	1	NM_004782.4	ENSP00000215730	P1
PI4KA	ENST00000449120.1 linkuse as main transcript	c.-19+44G>C	intron_variant		4		ENSP00000402437
SNAP29	ENST00000490458.1 linkuse as main transcript		upstream_gene_variant		2

Frequencies

GnomAD3 genomes

AF:

0.00656

AC:

998

AN:

152176

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0228

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00229

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000621

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.00430

GnomAD3 exomes

AF:

0.00161

AC:

341

AN:

212376

Hom.:

AF XY:

0.00118

AC XY:

138

AN XY:

116944

show subpopulations

Gnomad AFR exome

AF:

0.0226

Gnomad AMR exome

AF:

0.000994

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000941

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000437

Gnomad OTH exome

AF:

0.000380

GnomAD4 exome

AF:

0.000659

AC:

920

AN:

1396220

Hom.:

Cov.:

AF XY:

0.000592

AC XY:

412

AN XY:

696198

show subpopulations

Gnomad4 AFR exome

AF:

0.0226

Gnomad4 AMR exome

AF:

0.000906

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000931

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000104

Gnomad4 OTH exome

AF:

0.000946

GnomAD4 genome

AF:

0.00655

AC:

997

AN:

152292

Hom.:

Cov.:

AF XY:

0.00632

AC XY:

471

AN XY:

74482

show subpopulations

Gnomad4 AFR

AF:

0.0228

Gnomad4 AMR

AF:

0.00229

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000622

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00426

Alfa

AF:

0.000289

Hom.:

Bravo

AF:

0.00734

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

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	Jul 08, 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

-0.68

CADD

Benign

6.1

DANN

Benign

0.50

RBP_binding_hub_radar

0.92

RBP_regulation_power_radar

2.0

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