19-54803917-G-A

Position:

chr19-54803917-G-A

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_001080770.2(KIR2DL4):c.67G>A(p.Ala23Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000242 in 1,609,846 control chromosomes in the GnomAD database, including 14 homozygotes. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00069 ( 5 hom., cov: 28)

Exomes 𝑓: 0.00020 ( 9 hom. )

Consequence

KIR2DL4
NM_001080770.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.475

Variant links:

Genes affected

KIR2DL4 (HGNC:6332): (killer cell immunoglobulin like receptor, two Ig domains and long cytoplasmic tail 4) Killer cell immunoglobulin-like receptors (KIRs) are transmembrane glycoproteins expressed by natural killer cells and subsets of T cells. The KIR genes are polymorphic and highly homologous and they are found in a cluster on chromosome 19q13.4 within the 1 Mb leukocyte receptor complex (LRC). The gene content of the KIR gene cluster varies among haplotypes, although several "framework" genes are found in all haplotypes (KIR3DL3, KIR3DP1, KIR3DL4, KIR3DL2). The KIR proteins are classified by the number of extracellular immunoglobulin domains (2D or 3D) and by whether they have a long (L) or short (S) cytoplasmic domain. KIR proteins with the long cytoplasmic domain transduce inhibitory signals upon ligand binding via an immune tyrosine-based inhibitory motif (ITIM), while KIR proteins with the short cytoplasmic domain lack the ITIM motif and instead associate with the TYRO protein tyrosine kinase binding protein to transduce activating signals. The ligands for several KIR proteins are subsets of HLA class I molecules; thus, KIR proteins are thought to play an important role in regulation of the immune response. This gene is one of the "framework" loci that is present on all haplotypes. Alternate alleles of this gene are represented on multiple alternate reference loci (ALT_REF_LOCs). Alternative splicing results in multiple transcript variants, some of which may not be annotated on the primary reference assembly. [provided by RefSeq, Jul 2016]

KIR2DL4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

BS2

High Homozygotes in GnomAd4 at 5 gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KIR2DL4	NM_001080770.2 linkuse as main transcript	c.67G>A	p.Ala23Thr	missense_variant	2/7	ENST00000345540.10	NP_001074239.1
KIR2DL4	NM_001080772.2 linkuse as main transcript	c.67G>A	p.Ala23Thr	missense_variant	2/8		NP_001074241.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KIR2DL4	ENST00000345540.10 linkuse as main transcript	c.67G>A	p.Ala23Thr	missense_variant	2/7	1	NM_001080770.2	ENSP00000339634	A2	Q99706-3

Frequencies

GnomAD3 genomes

AF:

0.000694

AC:

104

AN:

149778

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00192

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000332

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:

0.000281

Gnomad OTH

AF:

0.00145

GnomAD3 exomes

AF:

0.000152

AC:

AN:

223004

Hom.:

AF XY:

0.000108

AC XY:

AN XY:

120756

show subpopulations

Gnomad AFR exome

AF:

0.00195

Gnomad AMR exome

AF:

0.0000336

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000393

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000290

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000195

AC:

285

AN:

1459956

Hom.:

Cov.:

AF XY:

0.000173

AC XY:

126

AN XY:

726304

show subpopulations

Gnomad4 AFR exome

AF:

0.00252

Gnomad4 AMR exome

AF:

0.000112

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000233

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.000156

Gnomad4 OTH exome

AF:

0.000315

GnomAD4 genome

AF:

0.000694

AC:

104

AN:

149890

Hom.:

Cov.:

AF XY:

0.000765

AC XY:

AN XY:

73156

show subpopulations

Gnomad4 AFR

AF:

0.00192

Gnomad4 AMR

AF:

0.000332

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000281

Gnomad4 OTH

AF:

0.00144

Alfa

AF:

0.000504

Hom.:

ESP6500AA

AF:

0.000982

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 07, 2023

The c.67G>A (p.A23T) alteration is located in exon 2 (coding exon 2) of the KIR2DL4 gene. This alteration results from a G to A substitution at nucleotide position 67, causing the alanine (A) at amino acid position 23 to be replaced by a threonine (T). 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

BayesDel_addAF

Benign

-0.59

BayesDel_noAF

Benign

-0.64

CADD

Benign

7.8

DANN

Benign

0.94

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.0092

M_CAP

Benign

0.00077

MetaRNN

Benign

0.0091

T;T;T;T;T;T

MetaSVM

Benign

-0.97

MutationAssessor

Benign

-0.075

.;.;N;N;N;.

MutationTaster

Benign

1.0

N;N;N;N;N;N;N;N;N;N

PROVEAN

Benign

-0.79

.;N;N;N;N;N

REVEL

Benign

0.030

Sift

Benign

0.10

.;T;T;T;D;D

Sift4G

Benign

0.41

T;T;T;T;T;T

Polyphen

0.0080, 0.0030, 0.010

.;.;B;B;.;B

Vest4

0.12

MVP

0.043

MPC

1.5

ClinPred

0.0026

GERP RS

0.073

gMVP

0.10

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.21

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.21

Position offset: -26

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