19-54803914-T-A

Variant names:

• chr19-54803914-T-A
• rs541099983
• NM_001080770.2:c.64T>A

Variant summary

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

The NM_001080770.2(KIR2DL4):​c.64T>A​(p.Trp22Arg) 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. 12/18 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 28)
• Consequence: KIR2DL4 NM_001080770.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.980

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]

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=0.089661).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KIR2DL4	NM_001080770.2	c.64T>A	p.Trp22Arg	missense_variant	Exon 2 of 7	ENST00000345540.10	NP_001074239.1
KIR2DL4	NM_001080772.2	c.64T>A	p.Trp22Arg	missense_variant	Exon 2 of 8		NP_001074241.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KIR2DL4	ENST00000345540.10	c.64T>A	p.Trp22Arg	missense_variant	Exon 2 of 7	1	NM_001080770.2	ENSP00000339634.5

Frequencies

GnomAD3 genomes Cov.: 28

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 28

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.20	T
BayesDel_noAF	Benign	-0.53
CADD	Benign	2.9
DANN	Benign	0.83
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.0046	N
M_CAP	Benign	0.00093	T
MetaRNN	Benign	0.090	T;T;T;T;T;T
MetaSVM	Benign	-0.94	T
MutationAssessor	Benign	0.38	.;.;N;N;N;.
PROVEAN	Pathogenic	-5.9	.;D;D;D;D;D
REVEL	Benign	0.14
Sift	Benign	0.18	.;T;T;T;T;T
Sift4G	Benign	0.27	T;T;T;T;T;T
Polyphen		0.0010, 0.49	.;.;B;B;.;P
Vest4		0.16
MVP		0.12
MPC		2.4
ClinPred		0.062	T
GERP RS		0.098
gMVP		0.16

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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

Other links and lift over

dbSNP: rs541099983; hg19: chr19-55315369;