22-20859240-T-C

Position:

• chr22-20859240-T-C

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_004782.4(SNAP29):​c.130T>C​(p.Tyr44His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00155 in 1,607,296 control chromosomes in the GnomAD database, including 32 homozygotes. In-silico tool predicts a benign outcome for this variant. 11/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0074 (17 hom., cov: 32)
  • Exomes 𝑓: 0.00094 (15 hom.)
• Consequence: SNAP29 NM_004782.4 missense
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6
• Conservation: PhyloP100: 0.766

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]

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]

SNAP29 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.0057190657).
• BP6: Variant 22-20859240-T-C is Benign according to our data. Variant chr22-20859240-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 340831.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr22-20859240-T-C is described in Lovd as [Benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00738 (1123/152252) while in subpopulation AFR AF= 0.0247 (1028/41556). AF 95% confidence interval is 0.0235. There are 17 homozygotes in gnomad4. There are 550 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 17 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SNAP29	NM_004782.4	c.130T>C	p.Tyr44His	missense_variant	1/5	ENST00000215730.12	NP_004773.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SNAP29	ENST00000215730.12	c.130T>C	p.Tyr44His	missense_variant	1/5	1	NM_004782.4	ENSP00000215730.6
PI4KA	ENST00000449120.1	c.-136A>G		5_prime_UTR_variant	1/4	4		ENSP00000402437.1
SNAP29	ENST00000490458.1	n.160T>C		non_coding_transcript_exon_variant	1/2	2

Frequencies

GnomAD3 genomes AF: 0.00739 AC: 1124 AN: 152134 Hom.: 17 Cov.: 32

Gnomad AFR AF: 0.0248

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00412

Gnomad ASJ AF: 0.000864

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000176

Gnomad OTH AF: 0.00813

GnomAD3 exomes AF: 0.00196 AC: 442 AN: 225234 Hom.: 7 AF XY: 0.00143 AC XY: 177 AN XY: 123842

Gnomad AFR exome AF: 0.0260

Gnomad AMR exome AF: 0.00141

Gnomad ASJ exome AF: 0.000646

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000340

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000318

Gnomad OTH exome AF: 0.00163

GnomAD4 exome AF: 0.000939 AC: 1366 AN: 1455044 Hom.: 15 Cov.: 32 AF XY: 0.000798 AC XY: 577 AN XY: 723492

Gnomad4 AFR exome AF: 0.0280

Gnomad4 AMR exome AF: 0.00168

Gnomad4 ASJ exome AF: 0.000465

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000234

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000210

Gnomad4 OTH exome AF: 0.00167

GnomAD4 genome AF: 0.00738 AC: 1123 AN: 152252 Hom.: 17 Cov.: 32 AF XY: 0.00739 AC XY: 550 AN XY: 74450

Gnomad4 AFR AF: 0.0247

Gnomad4 AMR AF: 0.00412

Gnomad4 ASJ AF: 0.000864

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000176

Gnomad4 OTH AF: 0.00805

Alfa AF: 0.000607 Hom.: 0

Bravo AF: 0.00851

ESP6500AA AF: 0.0208 AC: 88

ESP6500EA AF: 0.000121 AC: 1

ExAC AF: 0.00224 AC: 269

Asia WGS AF: 0.00173 AC: 6 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:2

Benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Sep 16, 2020	- -
Likely benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Oct 27, 2016	- -

CEDNIK syndrome Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Apr 15, 2022	- -
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. -

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Sep 04, 2019	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.58	T
BayesDel_noAF	Benign	-0.59
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.058	T
Eigen	Benign	-0.039
Eigen_PC	Benign	-0.015
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Benign	0.82	T
MetaRNN	Benign	0.0057	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.1	M
PrimateAI	Uncertain	0.66	T
PROVEAN	Benign	-0.54	N
REVEL	Benign	0.11
Sift	Benign	0.39	T
Sift4G	Benign	0.20	T
Polyphen		0.80	P
Vest4		0.32
MVP		0.60
MPC		0.18
ClinPred		0.017	T
GERP RS		3.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.2
Varity_R		0.088
gMVP		0.38

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: rs116644127; hg19: chr22-21213528; COSMIC: COSV99072322; COSMIC: COSV99072322;