chr6-31271640-C-G

Position:

• chr6-31271640-C-G

Variant summary

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

The NM_002117.6(HLA-C):​c.302G>C​(p.Ser101Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000469 in 1,066,242 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/19 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 variant affecting the same amino acid position, but resulting in a different missense (i.e. S101N) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0 (0 hom., cov: 9)
  • Exomes 𝑓: 0.0000047 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: HLA-C NM_002117.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -4.50

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]

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=0.23850495).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HLA-C	NM_002117.6	c.302G>C	p.Ser101Thr	missense_variant	2/8	ENST00000376228.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HLA-C	ENST00000376228.10	c.302G>C	p.Ser101Thr	missense_variant	2/8		NM_002117.6	P4

Frequencies

GnomAD3 genomes AF: 0.00 AC: 0 AN: 65952 Hom.: 0 Cov.: 9 FAILED QC

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: 0.00000469 AC: 5 AN: 1066242 Hom.: 0 Cov.: 32 AF XY: 0.00000373 AC XY: 2 AN XY: 535698

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: 0.0000258

Gnomad4 NFE exome AF: 0.00000373

Gnomad4 OTH exome AF: 0.0000224

GnomAD4 genome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 66014 Hom.: 0 Cov.: 9 AF XY: 0.00 AC XY: 0 AN XY: 31430

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.48
CADD	Benign	0.74
DANN	Benign	0.54
DEOGEN2	Benign	0.041	T;.
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.5
FATHMM_MKL	Benign	0.0055	N
LIST_S2	Benign	0.0073	T;T
M_CAP	Benign	0.0011	T
MetaRNN	Benign	0.24	T;T
MetaSVM	Benign	-0.93	T
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-1.3	N;N
REVEL	Benign	0.18
Sift	Uncertain	0.0040	D;D
Sift4G	Uncertain	0.042	D;D
Polyphen		0.0020	B;B
Vest4		0.14
MutPred		0.27		Loss of disorder (P = 0.0817);Loss of disorder (P = 0.0817);
MVP		0.16
MPC		0.51
ClinPred		0.22	T
GERP RS		-4.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
gMVP		0.27

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: rs2308557; hg19: chr6-31239417;