6-31271724-G-C

Variant names:

• chr6-31271724-G-C
• rs1050409
• NM_002117.6:c.218C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002117.6(HLA-C):​c.218C>G​(p.Ala73Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000072 in 1,388,138 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 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: 𝑓 0.0 (0 hom., cov: 14)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: HLA-C NM_002117.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.366
• Publications: 22 publications found

Genes affected

HLA-C (HGNC:4933): (major histocompatibility complex, class I, C) HLA-C belongs to the HLA class I heavy chain paralogues. This class I molecule is a heterodimer consisting of a heavy chain and a light chain (beta-2 microglobulin). The heavy chain is anchored in the membrane. Class I molecules play a central role in the immune system by presenting peptides derived from endoplasmic reticulum lumen. They are expressed in nearly all cells. The heavy chain is approximately 45 kDa and its gene contains 8 exons. Exon one encodes the leader peptide, exons 2 and 3 encode the alpha1 and alpha2 domain, which both bind the peptide, exon 4 encodes the alpha3 domain, exon 5 encodes the transmembrane region, and exons 6 and 7 encode the cytoplasmic tail. Polymorphisms within exon 2 and exon 3 are responsible for the peptide binding specificity of each class one molecule. Typing for these polymorphisms is routinely done for bone marrow and kidney transplantation. About 6000 HLA-C alleles have been described. The HLA system plays an important role in the occurrence and outcome of infectious diseases, including those caused by the malaria parasite, the human immunodeficiency virus (HIV), and the severe acute respiratory syndrome coronavirus (SARS-CoV). The structural spike and the nucleocapsid proteins of the novel coronavirus SARS-CoV-2, which causes coronavirus disease 2019 (COVID-19), are reported to contain multiple Class I epitopes with predicted HLA restrictions. Individual HLA genetic variation may help explain different immune responses to a virus across a population.[provided by RefSeq, Aug 2020]

ENSG00000288813 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.101812094).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HLA-C	NM_002117.6	c.218C>G	p.Ala73Gly	missense_variant	Exon 2 of 8	ENST00000376228.10	NP_002108.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HLA-C	ENST00000376228.10	c.218C>G	p.Ala73Gly	missense_variant	Exon 2 of 8	6	NM_002117.6	ENSP00000365402.5

Frequencies

GnomAD3 genomes AF: 0.00 AC: 0 AN: 97432 Hom.: 0 Cov.: 14

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 7.20e-7 AC: 1 AN: 1388138 Hom.: 0 Cov.: 39 AF XY: 0.00000145 AC XY: 1 AN XY: 691980

African (AFR) AF: 0.00 AC: 0 AN: 31282

American (AMR) AF: 0.00 AC: 0 AN: 42794

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24964

East Asian (EAS) AF: 0.00 AC: 0 AN: 37340

South Asian (SAS) AF: 0.00 AC: 0 AN: 84010

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49088

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4784

European-Non Finnish (NFE) AF: 9.46e-7 AC: 1 AN: 1057198

Other (OTH) AF: 0.00 AC: 0 AN: 56678

GnomAD4 genome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 97432 Hom.: 0 Cov.: 14 AF XY: 0.00 AC XY: 0 AN XY: 46872

African (AFR) AF: 0.00 AC: 0 AN: 22766

American (AMR) AF: 0.00 AC: 0 AN: 8674

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 2344

East Asian (EAS) AF: 0.00 AC: 0 AN: 3412

South Asian (SAS) AF: 0.00 AC: 0 AN: 3098

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 6112

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 208

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 48898

Other (OTH) AF: 0.00 AC: 0 AN: 1258

Alfa AF: 0.00 Hom.: 460

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.39
CADD	Benign	19
DANN	Benign	0.79
DEOGEN2	Benign	0.017	T;.
Eigen	Benign	-0.46
Eigen_PC	Benign	-0.56
FATHMM_MKL	Benign	0.055	N
LIST_S2	Benign	0.41	T;T
M_CAP	Benign	0.0021	T
MetaRNN	Benign	0.10	T;T
MetaSVM	Benign	-0.97	T
PhyloP100		0.37
PrimateAI	Uncertain	0.50	T
PROVEAN	Uncertain	-3.1	D;D
REVEL	Benign	0.17
Sift	Uncertain	0.0080	D;D
Sift4G	Uncertain	0.016	D;D
Polyphen		0.0020	B;B
Vest4		0.098
MutPred		0.49		Loss of stability (P = 0.023);Loss of stability (P = 0.023);
MVP		0.21
MPC		0.50
ClinPred		0.34	T
GERP RS		1.9
PromoterAI		-0.0038	Neutral
gMVP		0.29
Mutation Taster		=96/4	polymorphism

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

Other links and lift over

dbSNP: rs1050409; hg19: chr6-31239501;