19-51457491-T-C

Variant summary

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

The NM_014442.3(SIGLEC8):c.703A>G(p.Thr235Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000205 in 1,461,556 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.000021 ( 0 hom. )

Consequence

SIGLEC8
NM_014442.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -1.43

Variant links:

Genes affected

SIGLEC8 (HGNC:10877): (sialic acid binding Ig like lectin 8) Sialic acid-binding immunoglobulin (Ig)-like lectins, or SIGLECs (e.g., CD33 (MIM 159590)), are a family of type 1 transmembrane proteins each having a unique expression pattern, mostly in hemopoietic cells. SIGLEC8 is a member of the CD33-like subgroup of SIGLECs, which are localized to 19q13.3-q13.4 and have 2 conserved cytoplasmic tyrosine-based motifs: an immunoreceptor tyrosine-based inhibitory motif, or ITIM (see MIM 604964), and a motif homologous to one identified in signaling lymphocyte activation molecule (SLAM; MIM 603492) that mediates an association with SLAM-associated protein (SAP; MIM 300490) (summarized by Foussias et al., 2000 [PubMed 11095983]).[supplied by OMIM, May 2010]

SIGLEC8 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=0.048474282).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
SIGLEC8	NM_014442.3 linkuse as main transcript	c.703A>G	p.Thr235Ala	missense_variant	2/7	ENST00000321424.7
SIGLEC8	XM_011526734.3 linkuse as main transcript	c.670A>G	p.Thr224Ala	missense_variant	2/7
SIGLEC8	NM_001363548.1 linkuse as main transcript	c.455-260A>G		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SIGLEC8	ENST00000321424.7 linkuse as main transcript	c.703A>G	p.Thr235Ala	missense_variant	2/7	1	NM_014442.3	P1	Q9NYZ4-1
SIGLEC8	ENST00000340550.5 linkuse as main transcript	c.455-260A>G		intron_variant		1			Q9NYZ4-2
SIGLEC8	ENST00000430817.5 linkuse as main transcript	c.454+443A>G		intron_variant		2
SIGLEC8	ENST00000597352.1 linkuse as main transcript	n.319A>G		non_coding_transcript_exon_variant	1/3	4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000677

AC:

AN:

251104

Hom.:

AF XY:

0.0000590

AC XY:

AN XY:

135696

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000555

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000205

AC:

AN:

1461556

Hom.:

Cov.:

AF XY:

0.0000248

AC XY:

AN XY:

727114

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000325

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

Cov.:

ExAC

AF:

0.0000494

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

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

May 03, 2023

The c.703A>G (p.T235A) alteration is located in exon 2 (coding exon 2) of the SIGLEC8 gene. This alteration results from a A to G substitution at nucleotide position 703, causing the threonine (T) at amino acid position 235 to be replaced by an alanine (A). 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

0.092

BayesDel_addAF

Benign

-0.67

BayesDel_noAF

Benign

-0.85

Cadd

Benign

3.4

Dann

Benign

0.77

DEOGEN2

Benign

0.013

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.0038

LIST_S2

Benign

0.083

M_CAP

Benign

0.0014

MetaRNN

Benign

0.048

MetaSVM

Benign

-0.91

MutationAssessor

Benign

1.9

MutationTaster

Benign

1.0

N;N;N

PrimateAI

Benign

0.29

PROVEAN

Uncertain

-2.4

REVEL

Benign

0.021

Sift

Benign

0.16

Sift4G

Benign

0.35

Polyphen

0.043

Vest4

0.035

MutPred

0.46

Gain of sheet (P = 0.0085);

MVP

0.25

MPC

0.080

ClinPred

0.024

GERP RS

-0.73

Varity_R

0.059

gMVP

0.11

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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