8-78697419-G-T

Position:

• chr8-78697419-G-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_016010.3(ZC2HC1A):​c.517G>T​(p.Ala173Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000346 in 1,443,590 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: ZC2HC1A NM_016010.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.06

Genes affected

ZC2HC1A (HGNC:24277): (zinc finger C2HC-type containing 1A) Predicted to enable metal ion binding activity. [provided by Alliance of Genome Resources, Apr 2022]

IL7 (HGNC:6023): (interleukin 7) The protein encoded by this gene is a cytokine important for B and T cell development. This cytokine and the hepatocyte growth factor (HGF) form a heterodimer that functions as a pre-pro-B cell growth-stimulating factor. IL7 is found to be a cofactor for V(D)J rearrangement of the T cell receptor beta (TCRB) during early T cell development. This cytokine can be produced locally by intestinal epithelial and epithelial goblet cells, and may serve as a regulatory factor for intestinal mucosal lymphocytes. IL7 plays an essential role in lymphoid cell survival, and in the maintenance of naive and memory T cells. Alternative splicing results in multiple transcript variants encoding distinct isoforms. Additional splice variants have been described but their presence in normal tissues has not been confirmed. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection can be a potent inducer of proinflammatory cytokines and chemokines which may defend against the infection, but may also mediate destructive lung injury. Elevated serum IL7 levels, together with several other circulating cytokines and chemokines, has been found to be associated with the severity of Coronavirus Disease 19 (COVID-19). [provided by RefSeq, Jul 2020]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06639421).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ZC2HC1A	NM_016010.3	c.517G>T	p.Ala173Ser	missense_variant	6/9	ENST00000263849.9	NP_057094.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ZC2HC1A	ENST00000263849.9	c.517G>T	p.Ala173Ser	missense_variant	6/9	1	NM_016010.3	ENSP00000263849	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000346 AC: 5 AN: 1443590 Hom.: 0 Cov.: 30 AF XY: 0.00000418 AC XY: 3 AN XY: 718026

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000251

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: 0.00000362

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 06, 2024

The c.517G>T (p.A173S) alteration is located in exon 6 (coding exon 6) of the ZC2HC1A gene. This alteration results from a G to T substitution at nucleotide position 517, causing the alanine (A) at amino acid position 173 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.080
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	12
DANN	Benign	0.92
DEOGEN2	Benign	0.010	T
Eigen	Benign	-0.34
Eigen_PC	Benign	-0.27
FATHMM_MKL	Benign	0.74	D
LIST_S2	Benign	0.71	T
M_CAP	Benign	0.015	T
MetaRNN	Benign	0.066	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.7	L
MutationTaster	Benign	0.74	N
PrimateAI	Benign	0.27	T
PROVEAN	Benign	0.040	N
REVEL	Benign	0.016
Sift	Benign	0.52	T
Sift4G	Benign	0.57	T
Polyphen		0.11	B
Vest4		0.42
MutPred		0.10		Gain of phosphorylation at A173 (P = 0.0111);
MVP		0.082
MPC		0.098
ClinPred		0.065	T
GERP RS		2.7
Varity_R		0.034
gMVP		0.19

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs138000597; hg19: chr8-79609654;