16-1221819-G-A

Position:

chr16-1221819-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_012467.4(TPSG1):c.935C>T(p.Ala312Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000124 in 1,609,952 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 34)

Exomes 𝑓: 0.00013 ( 0 hom. )

Consequence

TPSG1
NM_012467.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.269

Variant links:

Genes affected

TPSG1 (HGNC:14134): (tryptase gamma 1) Tryptases comprise a family of trypsin-like serine proteases, the peptidase family S1. Tryptases are enzymatically active only as heparin-stabilized tetramers, and they are resistant to all known endogenous proteinase inhibitors. Several tryptase genes are clustered on chromosome 16p13.3. There is uncertainty regarding the number of genes in this cluster. Currently four functional genes - alpha I, beta I, beta II and gamma I - have been identified. And beta I has an allelic variant named alpha II, beta II has an allelic variant beta III, also gamma I has an allelic variant gamma II. Beta tryptases appear to be the main isoenzymes expressed in mast cells; whereas in basophils, alpha-tryptases predominant. This gene differs from other members of the tryptase gene family in that it has C-terminal hydrophobic domain, which may serve as a membrane anchor. Tryptases have been implicated as mediators in the pathogenesis of asthma and other allergic and inflammatory disorders. [provided by RefSeq, Jul 2008]

TPSG1 links:

CACNA1H (HGNC:1395): (calcium voltage-gated channel subunit alpha1 H) This gene encodes a T-type member of the alpha-1 subunit family, a protein in the voltage-dependent calcium channel complex. Calcium channels mediate the influx of calcium ions into the cell upon membrane polarization and consist of a complex of alpha-1, alpha-2/delta, beta, and gamma subunits in a 1:1:1:1 ratio. The alpha-1 subunit has 24 transmembrane segments and forms the pore through which ions pass into the cell. There are multiple isoforms of each of the proteins in the complex, either encoded by different genes or the result of alternative splicing of transcripts. Alternate transcriptional splice variants, encoding different isoforms, have been characterized for the gene described here. Studies suggest certain mutations in this gene lead to childhood absence epilepsy (CAE). [provided by RefSeq, Jul 2008]

CACNA1H links:

CACNA1H (HGNC:):

CACNA1H links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.03874162).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TPSG1	NM_012467.4 linkuse as main transcript	c.935C>T	p.Ala312Val	missense_variant	6/6	ENST00000234798.5	NP_036599.4	Q9NRR2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
TPSG1	ENST00000234798.5 linkuse as main transcript	c.935C>T	p.Ala312Val	missense_variant	6/6	1	NM_012467.4	ENSP00000234798.4	Q9NRR2
CACNA1H	ENST00000638323.1 linkuse as main transcript	c.*825G>A		downstream_gene_variant		5		ENSP00000492267.1	A0A1W2PR14
CACNA1H	ENST00000639478.1 linkuse as main transcript	n.*2935G>A		downstream_gene_variant		5		ENSP00000491945.1	A0A1W2PQW2
CACNA1H	ENST00000640028.1 linkuse as main transcript	n.*5705G>A		downstream_gene_variant		5		ENSP00000491488.1	A0A1W2PQ19

Frequencies

GnomAD3 genomes

AF:

0.000105

AC:

AN:

152218

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000314

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000611

AC:

AN:

245590

Hom.:

AF XY:

0.0000375

AC XY:

AN XY:

133450

show subpopulations

Gnomad AFR exome

AF:

0.000507

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000637

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000126

AC:

183

AN:

1457616

Hom.:

Cov.:

AF XY:

0.000110

AC XY:

AN XY:

724602

show subpopulations

Gnomad4 AFR exome

AF:

0.000628

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000141

Gnomad4 OTH exome

AF:

0.0000664

GnomAD4 genome

AF:

0.000112

AC:

AN:

152336

Hom.:

Cov.:

AF XY:

0.0000806

AC XY:

AN XY:

74484

show subpopulations

Gnomad4 AFR

AF:

0.000337

Gnomad4 AMR

AF:

0.0000653

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000658

Hom.:

Bravo

AF:

0.000144

ESP6500AA

AF:

0.000228

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000660

AC:

Asia WGS

AF:

0.000866

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000178

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 27, 2024

The c.935C>T (p.A312V) alteration is located in exon 6 (coding exon 6) of the TPSG1 gene. This alteration results from a C to T substitution at nucleotide position 935, causing the alanine (A) at amino acid position 312 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.079

BayesDel_addAF

Benign

-0.37

BayesDel_noAF

Benign

-0.43

CADD

Benign

4.9

DANN

Benign

0.95

Eigen

Benign

-1.4

Eigen_PC

Benign

-1.4

FATHMM_MKL

Benign

0.046

M_CAP

Benign

0.0035

MetaRNN

Benign

0.039

MetaSVM

Benign

-0.80

PrimateAI

Benign

0.26

PROVEAN

Benign

-0.15

REVEL

Benign

0.25

Sift

Benign

0.20

Sift4G

Benign

0.57

Vest4

0.065

MVP

0.26

MPC

0.0029

ClinPred

0.013

GERP RS

-2.6

gMVP

0.21

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