Genetic Variant HHLA2:p.Thr226Met (chr3-108355373-C-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

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

The NM_001282556.2(HHLA2):c.677C>T(p.Thr226Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000695 in 1,612,436 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: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000060 ( 0 hom. )

Consequence

HHLA2
NM_001282556.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.374

Variant links:

Genes affected

HHLA2 (HGNC:4905): (HHLA2 member of B7 family) This gene encodes a protein ligand found on the surface of monocytes. The encoded protein is thought to regulate cell-mediated immunity by binding to a receptor on T lymphocytes and inhibiting the proliferation of these cells. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Sep 2013]

HHLA2 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=0.05948192).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HHLA2	NM_001282556.2 link	c.677C>T	p.Thr226Met	missense_variant	Exon 5 of 10	ENST00000467761.6	NP_001269485.1	Q9UM44-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HHLA2	ENST00000467761.6 link	c.677C>T	p.Thr226Met	missense_variant	Exon 5 of 10	5	NM_001282556.2	ENSP00000419207.1		Q9UM44-1

Frequencies

GnomAD3 genomes

AF:

0.000164

AC:

AN:

152088

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000507

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

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:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000811

AC:

AN:

246480

Hom.:

AF XY:

0.0000598

AC XY:

AN XY:

133868

show subpopulations

Gnomad AFR exome

AF:

0.000454

Gnomad AMR exome

AF:

0.0000291

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000329

Gnomad FIN exome

AF:

0.0000467

Gnomad NFE exome

AF:

0.0000900

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000596

AC:

AN:

1460230

Hom.:

Cov.:

AF XY:

0.0000427

AC XY:

AN XY:

726246

show subpopulations

Gnomad4 AFR exome

AF:

0.000449

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000756

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.0000750

Gnomad4 NFE exome

AF:

0.0000513

Gnomad4 OTH exome

AF:

0.0000829

GnomAD4 genome

AF:

0.000164

AC:

AN:

152206

Hom.:

Cov.:

AF XY:

0.000148

AC XY:

AN XY:

74418

show subpopulations

Gnomad4 AFR

AF:

0.000506

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000101

Hom.:

Bravo

AF:

0.000128

ExAC

AF:

0.0000993

AC:

EpiCase

AF:

0.0000546

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Oct 12, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.677C>T (p.T226M) alteration is located in exon 5 (coding exon 3) of the HHLA2 gene. This alteration results from a C to T substitution at nucleotide position 677, causing the threonine (T) at amino acid position 226 to be replaced by a methionine (M). 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

0.080

BayesDel_addAF

Benign

-0.46

BayesDel_noAF

Benign

-0.57

CADD

Benign

DANN

Benign

0.96

DEOGEN2

Benign

0.013

T;T;.;T;T;T

Eigen

Benign

-0.70

Eigen_PC

Benign

-0.85

FATHMM_MKL

Benign

0.019

LIST_S2

Benign

0.72

T;T;T;.;.;.

M_CAP

Benign

0.014

MetaRNN

Benign

0.059

T;T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.2

L;.;.;L;L;L

PrimateAI

Benign

0.33

PROVEAN

Benign

-0.64

.;N;N;N;N;N

REVEL

Benign

0.080

Sift

Uncertain

0.012

.;D;D;D;D;D

Sift4G

Pathogenic

0.0

D;D;D;D;D;D

Polyphen

0.97

D;P;.;D;D;D

Vest4

0.17

MVP

0.48

MPC

0.35

ClinPred

0.024

GERP RS

-3.0

Varity_R

0.026

gMVP

0.22

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

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