9-117713143-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_138554.5(TLR4):c.1015A>G(p.Asn339Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N339K) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TLR4 NM_138554.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.894

Genes affected

TLR4 (HGNC:11850): (toll like receptor 4) The protein encoded by this gene is a member of the Toll-like receptor (TLR) family which plays a fundamental role in pathogen recognition and activation of innate immunity. TLRs are highly conserved from Drosophila to humans and share structural and functional similarities. They recognize pathogen-associated molecular patterns that are expressed on infectious agents, and mediate the production of cytokines necessary for the development of effective immunity. The various TLRs exhibit different patterns of expression. In silico studies have found a particularly strong binding of surface TLR4 with the spike protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the causative agent of Coronavirus disease-2019 (COVID-19). This receptor has also been implicated in signal transduction events induced by lipopolysaccharide (LPS) found in most gram-negative bacteria. Mutations in this gene have been associated with differences in LPS responsiveness, and with susceptibility to age-related macular degeneration. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2020]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.14394748).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TLR4	NM_138554.5	c.1015A>G	p.Asn339Asp	missense_variant	3/3	ENST00000355622.8
TLR4	NM_003266.4	c.895A>G	p.Asn299Asp	missense_variant	4/4
TLR4	NM_138557.3	c.415A>G	p.Asn139Asp	missense_variant	2/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TLR4	ENST00000355622.8	c.1015A>G	p.Asn339Asp	missense_variant	3/3	1	NM_138554.5	P1
TLR4	ENST00000394487.5	c.895A>G	p.Asn299Asp	missense_variant	4/4	1
TLR4	ENST00000472304.2	c.*749A>G		3_prime_UTR_variant	2/2	1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

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 15, 2021

The c.1015A>G (p.N339D) alteration is located in exon 3 (coding exon 3) of the TLR4 gene. This alteration results from a A to G substitution at nucleotide position 1015, causing the asparagine (N) at amino acid position 339 to be replaced by an aspartic acid (D). 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	0.10
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.72
Cadd	Benign	2.8
Dann	Benign	0.90
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.098	N
LIST_S2	Benign	0.53	T;.;T
M_CAP	Benign	0.0060	T
MetaRNN	Benign	0.14	T;T;T
MetaSVM	Benign	-0.99	T
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.31	T
PROVEAN	Benign	-1.6	N;.;N
REVEL	Benign	0.035
Sift	Benign	0.22	T;.;T
Sift4G	Benign	0.71	T;.;T
Polyphen		0.0090	.;B;B
Vest4		0.042
MutPred		0.51		.;Gain of ubiquitination at K341 (P = 0.0831);Gain of ubiquitination at K341 (P = 0.0831);
MVP		0.43
MPC		0.10
ClinPred		0.042	T
GERP RS		-1.5
Varity_R		0.62
gMVP		0.13

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: chr9-120475421;