rs1555121379

Variant names:

• chr11-118349833-A-C
• rs1555121379
• NM_000073.3:c.170A>C

Variant summary

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

The NM_000073.3(CD3G):​c.170A>C​(p.Lys57Thr) 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 1,461,860 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: CD3G NM_000073.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.11

Genes affected

CD3G (HGNC:1675): (CD3 gamma subunit of T-cell receptor complex) The protein encoded by this gene is the CD3-gamma polypeptide, which together with CD3-epsilon, -delta and -zeta, and the T-cell receptor alpha/beta and gamma/delta heterodimers, forms the T-cell receptor-CD3 complex. This complex plays an important role in coupling antigen recognition to several intracellular signal-transduction pathways. The genes encoding the epsilon, gamma and delta polypeptides are located in the same cluster on chromosome 11. Defects in this gene are associated with T cell immunodeficiency. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CD3G	NM_000073.3	c.170A>C	p.Lys57Thr	missense_variant	Exon 3 of 7	ENST00000532917.3	NP_000064.1
CD3G	XM_005271724.5	c.170A>C	p.Lys57Thr	missense_variant	Exon 3 of 4		XP_005271781.1
CD3G	XM_006718941.4	c.170A>C	p.Lys57Thr	missense_variant	Exon 3 of 7		XP_006719004.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CD3G	ENST00000532917.3	c.170A>C	p.Lys57Thr	missense_variant	Exon 3 of 7	1	NM_000073.3	ENSP00000431445.2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461860 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727230

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.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Combined immunodeficiency due to CD3gamma deficiency Uncertain:1

Nov 15, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces lysine with threonine at codon 57 of the CD3G protein (p.Lys57Thr). The lysine residue is moderately conserved and there is a moderate physicochemical difference between lysine and threonine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with CD3G-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site, but this prediction has not been confirmed by published transcriptional studies. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.54
BayesDel_addAF	Benign	-0.026	T
BayesDel_noAF	Benign	-0.27
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.61	D
Eigen	Uncertain	0.40
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Benign	0.72	D
LIST_S2	Benign	0.71	T
M_CAP	Benign	0.035	D
MetaRNN	Uncertain	0.63	D
MetaSVM	Benign	-0.69	T
MutationAssessor	Uncertain	2.6	M
PrimateAI	Benign	0.46	T
PROVEAN	Uncertain	-2.7	D
REVEL	Uncertain	0.32
Sift	Benign	0.10	T
Sift4G	Benign	0.16	T
Polyphen		0.99	D
Vest4		0.50
MutPred		0.48		Loss of methylation at K57 (P = 0.006);
MVP		0.81
MPC		1.1
ClinPred		0.90	D
GERP RS		4.8
Varity_R		0.27
gMVP		0.79

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.16		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: rs1555121379; hg19: chr11-118220548;