2-86790452-C-G

Position:

• chr2-86790452-C-G

Variant summary

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

The NM_001768.7(CD8A):​c.279G>C​(p.Arg93Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,840 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in same amino acid change has been previously reported as Uncertain significancein ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R93K) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: CD8A NM_001768.7 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.158

Genes affected

CD8A (HGNC:1706): (CD8 subunit alpha) The CD8 antigen is a cell surface glycoprotein found on most cytotoxic T lymphocytes that mediates efficient cell-cell interactions within the immune system. The CD8 antigen acts as a coreceptor with the T-cell receptor on the T lymphocyte to recognize antigens displayed by an antigen presenting cell in the context of class I MHC molecules. The coreceptor functions as either a homodimer composed of two alpha chains or as a heterodimer composed of one alpha and one beta chain. Both alpha and beta chains share significant homology to immunoglobulin variable light chains. This gene encodes the CD8 alpha chain. Multiple transcript variants encoding different isoforms have been found for this gene. The major protein isoforms of this gene differ by the presence or absence of a transmembrane domain and thus differ in being a membrane-anchored or secreted protein. [provided by RefSeq, May 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=0.18939394).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CD8A	NM_001768.7	c.279G>C	p.Arg93Ser	missense_variant	2/6	ENST00000283635.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CD8A	ENST00000283635.8	c.279G>C	p.Arg93Ser	missense_variant	2/6	1	NM_001768.7	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461840 Hom.: 0 Cov.: 34 AF XY: 0.00000138 AC XY: 1 AN XY: 727218

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.64
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.47
CADD	Benign	18
DANN	Benign	0.96
DEOGEN2	Uncertain	0.65	.;D;D;T
Eigen	Benign	-0.50
Eigen_PC	Benign	-0.63
FATHMM_MKL	Benign	0.081	N
LIST_S2	Benign	0.69	T;.;T;T
M_CAP	Benign	0.041	D
MetaRNN	Benign	0.19	T;T;T;T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	1.0	L;L;L;.
MutationTaster	Benign	1.0	N;N;N;N;N;N
PrimateAI	Benign	0.29	T
PROVEAN	Uncertain	-3.1	D;D;D;D
REVEL	Benign	0.069
Sift	Uncertain	0.0050	D;D;D;D
Sift4G	Uncertain	0.014	D;D;D;D
Polyphen		0.38	B;P;P;.
Vest4		0.18
MutPred		0.47		Gain of ubiquitination at K92 (P = 0.0495);Gain of ubiquitination at K92 (P = 0.0495);Gain of ubiquitination at K92 (P = 0.0495);Gain of ubiquitination at K92 (P = 0.0495);
MVP		0.88
MPC		1.1
ClinPred		0.61	D
GERP RS		2.9
Varity_R		0.60
gMVP		0.54

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

Other links and lift over

dbSNP: rs2229240; hg19: chr2-87017575;