20-3690213-A-T

Position:

• chr20-3690213-A-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_023068.4(SIGLEC1):​c.4643T>A​(p.Leu1548His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000285 in 1,404,202 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000028 (0 hom.)
• Consequence: SIGLEC1 NM_023068.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.904

Genes affected

SIGLEC1 (HGNC:11127): (sialic acid binding Ig like lectin 1) This gene encodes a member of the immunoglobulin superfamily. The encoded protein is a lectin-like adhesion molecule that binds glycoconjugate ligands on cell surfaces in a sialic acid-dependent manner. It is a type I transmembrane protein expressed only by a subpopulation of macrophages and is involved in mediating cell-cell interactions. The protein plays an important role in multiple human diseases and bacterial and viral infections has been shown to enhance SARS-CoV-2 infection. [provided by RefSeq, Dec 2021]

ACMG classification

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=0.061077952).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SIGLEC1	NM_023068.4	c.4643T>A	p.Leu1548His	missense_variant	19/22	ENST00000344754.6
SIGLEC1	NM_001367089.1	c.4643T>A	p.Leu1548His	missense_variant	18/20

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SIGLEC1	ENST00000344754.6	c.4643T>A	p.Leu1548His	missense_variant	19/22	1	NM_023068.4	P2
SIGLEC1	ENST00000707083.1	c.4643T>A	p.Leu1548His	missense_variant	18/20			A2
SIGLEC1	ENST00000419548.4	c.1085T>A	p.Leu362His	missense_variant	5/5	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000285 AC: 4 AN: 1404202 Hom.: 0 Cov.: 33 AF XY: 0.00000288 AC XY: 2 AN XY: 693318

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000369

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 27, 2023

The c.4643T>A (p.L1548H) alteration is located in exon 18 (coding exon 18) of the SIGLEC1 gene. This alteration results from a T to A substitution at nucleotide position 4643, causing the leucine (L) at amino acid position 1548 to be replaced by a histidine (H). 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	0.16
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	12
DANN	Benign	0.53
DEOGEN2	Benign	0.064	T
Eigen	Benign	-0.86
Eigen_PC	Benign	-0.80
FATHMM_MKL	Benign	0.024	N
LIST_S2	Benign	0.47	T
M_CAP	Benign	0.0036	T
MetaRNN	Benign	0.061	T
MetaSVM	Benign	-0.96	T
MutationAssessor	Benign	1.4	L
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.35	T
PROVEAN	Benign	-0.84	N
REVEL	Benign	0.046
Sift	Benign	0.32	T
Sift4G	Benign	0.26	T
Polyphen		0.035	B
Vest4		0.14
MutPred		0.27		Gain of disorder (P = 0.0665);
MVP		0.32
MPC		0.16
ClinPred		0.12	T
GERP RS		-0.13
Varity_R		0.13
gMVP		0.37

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-3670860;