NM_170601.5:c.1414C>T

Variant names:

• chr11-124637109-G-A
• rs1186440421
• NM_170601.5:c.1414C>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_170601.5(SIAE):​c.1414C>T​(p.His472Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,890 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H472Q) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: SIAE NM_170601.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.32
• Publications: 0 publications found

Genes affected

SIAE (HGNC:18187): (sialic acid acetylesterase) This gene encodes an enzyme which removes 9-O-acetylation modifications from sialic acids. Mutations in this gene are associated with susceptibility to autoimmune disease 6. Multiple transcript variants encoding different isoforms, found either in the cytosol or in the lysosome, have been found for this gene.[provided by RefSeq, Feb 2011]

SIAE Gene-Disease associations (from GenCC):

• autoimmune disease, susceptibility to, 6

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.05583635).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SIAE	NM_170601.5	c.1414C>T	p.His472Tyr	missense_variant	Exon 10 of 10	ENST00000263593.8	NP_733746.1
SIAE	NM_001199922.2	c.1309C>T	p.His437Tyr	missense_variant	Exon 12 of 12		NP_001186851.1
SIAE	XM_047427132.1	c.841C>T	p.His281Tyr	missense_variant	Exon 7 of 7		XP_047283088.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SIAE	ENST00000263593.8	c.1414C>T	p.His472Tyr	missense_variant	Exon 10 of 10	1	NM_170601.5	ENSP00000263593.3
SIAE	ENST00000618733.4	c.1309C>T	p.His437Tyr	missense_variant	Exon 12 of 12	1		ENSP00000478211.1
SIAE	ENST00000545756.5	c.1309C>T	p.His437Tyr	missense_variant	Exon 11 of 11	5		ENSP00000437877.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251470 AF XY: 0.00000736

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461890 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727248

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.0000671 AC: 3 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1112012

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jan 06, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces histidine, which is basic and polar, with tyrosine, which is neutral and polar, at codon 472 of the SIAE protein (p.His472Tyr). This variant is present in population databases (no rsID available, gnomAD 0.003%). This variant has not been reported in the literature in individuals affected with SIAE-related conditions. ClinVar contains an entry for this variant (Variation ID: 1919370). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The tyrosine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.072
BayesDel_addAF	Benign	-0.20	T
BayesDel_noAF	Benign	-0.44
CADD	Benign	0.85
DANN	Benign	0.80
DEOGEN2	Benign	0.080	T;.;.
Eigen	Benign	-1.0
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.33	N
LIST_S2	Benign	0.27	T;T;.
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.056	T;T;T
MetaSVM	Benign	-0.85	T
MutationAssessor	Benign	0.90	L;.;.
PhyloP100		1.3
PrimateAI	Benign	0.25	T
PROVEAN	Benign	-0.86	N;N;.
REVEL	Benign	0.20
Sift	Benign	1.0	T;T;.
Sift4G	Benign	0.27	T;T;T
Polyphen		0.099	B;.;.
Vest4		0.079
MutPred		0.44		Gain of sheet (P = 0.1208);.;.;
MVP		0.34
MPC		0.16
ClinPred		0.070	T
GERP RS		0.28
Varity_R		0.019
gMVP		0.30
Mutation Taster		=90/10	polymorphism

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

Other links and lift over

dbSNP: rs1186440421; hg19: chr11-124507005;