Genetic Variant TLR8:p.His215Gln (chrX-12919685-C-G) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 1P and 4B. PP3BS2

The NM_138636.5(TLR8):c.645C>G(p.His215Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000414 in 1,207,509 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 2 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 14/23 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as (no stars). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Synonymous variant affecting the same amino acid position (i.e. H215H) has been classified as Benign.

Frequency

Genomes: 𝑓 0.0000091 ( 0 hom., 0 hem., cov: 22)

Exomes 𝑓: 0.0000036 ( 0 hom. 2 hem. )

Consequence

TLR8
NM_138636.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -4.52

Publications

39 publications found

Variant links:

Genes affected

TLR8 (HGNC:15632): (toll like receptor 8) 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 (PAMPs) 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. This gene is predominantly expressed in lung and peripheral blood leukocytes, and lies in close proximity to another family member, TLR7, on chromosome X. [provided by RefSeq, Jul 2008]

TLR8 links:

TLR8-AS1 (HGNC:40720): (TLR8 antisense RNA 1)

TLR8-AS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

BS2

High Hemizygotes in GnomAdExome4 at 2 Unknown gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_138636.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
TLR8	NM_138636.5	MANE Select	c.645C>G	p.His215Gln	missense	Exon 2 of 2	NP_619542.1	Q9NR97-1
TLR8	NM_016610.4		c.699C>G	p.His233Gln	missense	Exon 3 of 3	NP_057694.2
TLR8-AS1	NR_030727.1		n.241-11352G>C		intron	N/A

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TLR8	ENST00000218032.7	TSL:1 MANE Select	c.645C>G	p.His215Gln	missense	Exon 2 of 2	ENSP00000218032.7	Q9NR97-1
	TLR8	ENST00000311912.5	TSL:1	c.699C>G	p.His233Gln	missense	Exon 3 of 3	ENSP00000312082.5	Q9NR97-2

Frequencies

GnomAD3 genomes

AF:

0.00000908

AC:

AN:

110135

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000190

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000549

AC:

AN:

182112

AF XY:

0.0000149

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000123

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000365

AC:

AN:

1097374

Hom.:

Cov.:

AF XY:

0.00000551

AC XY:

AN XY:

362750

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26395

American (AMR)

AF:

0.00

AC:

AN:

35161

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19373

East Asian (EAS)

AF:

0.00

AC:

AN:

30199

South Asian (SAS)

AF:

0.00

AC:

AN:

54030

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40510

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4132

European-Non Finnish (NFE)

AF:

0.00000475

AC:

AN:

841503

Other (OTH)

AF:

0.00

AC:

AN:

46071

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00000908

AC:

AN:

110135

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

32353

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

30182

American (AMR)

AF:

0.00

AC:

AN:

10254

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2630

East Asian (EAS)

AF:

0.00

AC:

AN:

3544

South Asian (SAS)

AF:

0.00

AC:

AN:

2623

European-Finnish (FIN)

AF:

0.00

AC:

AN:

5761

Middle Eastern (MID)

AF:

0.00

AC:

AN:

235

European-Non Finnish (NFE)

AF:

0.0000190

AC:

AN:

52744

Other (OTH)

AF:

0.00

AC:

AN:

1493

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

28896

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Benign

-0.58

BayesDel_noAF

Benign

-1.1

CADD

Benign

0.014

(source)

DANN

Benign

0.57

DEOGEN2

Benign

0.086

FATHMM_MKL

Benign

0.061

LIST_S2

Benign

0.45

M_CAP

Benign

0.0078

MetaRNN

Benign

0.043

MetaSVM

Benign

-0.92

MutationAssessor

Benign

0.60

PhyloP100

-4.5

PrimateAI

Benign

0.26

PROVEAN

Benign

-0.76

REVEL

Benign

0.015

Sift

Benign

0.30

Sift4G

Benign

0.37

Polyphen

0.035

Vest4

0.071

MutPred

0.23

Loss of ubiquitination at K219 (P = 0.1045)

MVP

0.093

MPC

0.76

ClinPred

0.073

GERP RS

-5.0

Varity_R

0.22

gMVP

0.35

Mutation Taster

=95/5

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.70

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.70

Position offset: 1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over