chr8-78689371-G-C

Position:

• chr8-78689371-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_016010.3(ZC2HC1A):​c.502G>C​(p.Val168Leu) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000351 in 1,425,090 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/23 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. 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, splice_region
• Scores: Splicing: ADA: 0.003385
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.21

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 Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.37200367).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ZC2HC1A	NM_016010.3	c.502G>C	p.Val168Leu	missense_variant, splice_region_variant	5/9	ENST00000263849.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ZC2HC1A	ENST00000263849.9	c.502G>C	p.Val168Leu	missense_variant, splice_region_variant	5/9	1	NM_016010.3	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000180 AC: 4 AN: 222400 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 120936

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000251

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000351 AC: 5 AN: 1425090 Hom.: 0 Cov.: 31 AF XY: 0.00000141 AC XY: 1 AN XY: 708556

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000131

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ExAC AF: 0.0000247 AC: 3

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

Jun 22, 2023

The c.502G>C (p.V168L) alteration is located in exon 5 (coding exon 5) of the ZC2HC1A gene. This alteration results from a G to C substitution at nucleotide position 502, causing the valine (V) at amino acid position 168 to be replaced by a leucine (L). 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	0.12
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.32
CADD	Benign	21
DANN	Benign	0.90
DEOGEN2	Benign	0.011	T
Eigen	Uncertain	0.56
Eigen_PC	Uncertain	0.59
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.30	T
M_CAP	Benign	0.042	D
MetaRNN	Benign	0.37	T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	0.69	N
MutationTaster	Benign	0.70	D
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-0.44	N
REVEL	Benign	0.23
Sift	Benign	0.36	T
Sift4G	Benign	0.74	T
Polyphen		0.98	D
Vest4		0.60
MutPred		0.17		Loss of ubiquitination at K170 (P = 0.0919);
MVP		0.31
MPC		0.093
ClinPred		0.26	T
GERP RS		5.1
Varity_R		0.11
gMVP		0.14

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0034
dbscSNV1_RF	Benign	0.020
SpliceAI score (max)		0.030		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: rs574401853; hg19: chr8-79601606;