8-78736505-G-A

Position:

• chr8-78736505-G-A

Variant summary

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

The NM_000880.4(IL7):​c.383C>T​(p.Ala128Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00016 in 1,602,360 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00041 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00013 (0 hom.)
• Consequence: IL7 NM_000880.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.37

Genes affected

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=0.052866876).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IL7	NM_000880.4	c.383C>T	p.Ala128Val	missense_variant	5/6	ENST00000263851.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IL7	ENST00000263851.9	c.383C>T	p.Ala128Val	missense_variant	5/6	1	NM_000880.4

Frequencies

GnomAD3 genomes AF: 0.000414 AC: 63 AN: 152086 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000869

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00131

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: 0.0000736

Gnomad OTH AF: 0.000958

GnomAD3 exomes AF: 0.000194 AC: 48 AN: 247760 Hom.: 0 AF XY: 0.000119 AC XY: 16 AN XY: 133976

Gnomad AFR exome AF: 0.000747

Gnomad AMR exome AF: 0.000689

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000976

Gnomad OTH exome AF: 0.000335

GnomAD4 exome AF: 0.000133 AC: 193 AN: 1450274 Hom.: 0 Cov.: 26 AF XY: 0.000127 AC XY: 92 AN XY: 721598

Gnomad4 AFR exome AF: 0.000843

Gnomad4 AMR exome AF: 0.000634

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000237

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000101

Gnomad4 OTH exome AF: 0.000284

GnomAD4 genome AF: 0.000414 AC: 63 AN: 152086 Hom.: 0 Cov.: 33 AF XY: 0.000471 AC XY: 35 AN XY: 74294

Gnomad4 AFR AF: 0.000869

Gnomad4 AMR AF: 0.00131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000736

Gnomad4 OTH AF: 0.000958

Alfa AF: 0.000119 Hom.: 0

Bravo AF: 0.000484

TwinsUK AF: 0.000539 AC: 2

ALSPAC AF: 0.00 AC: 0

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.000115 AC: 14

Asia WGS AF: 0.000579 AC: 2 AN: 3470

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

Dec 17, 2023

The c.383C>T (p.A128V) alteration is located in exon 5 (coding exon 5) of the IL7 gene. This alteration results from a C to T substitution at nucleotide position 383, causing the alanine (A) at amino acid position 128 to be replaced by a valine (V). 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	0.093
BayesDel_addAF	Benign	-0.43	T
BayesDel_noAF	Benign	-0.48
CADD	Benign	16
DANN	Uncertain	0.98
DEOGEN2	Benign	0.27	T;.
Eigen	Benign	-0.81
Eigen_PC	Benign	-0.81
FATHMM_MKL	Benign	0.12	N
LIST_S2	Benign	0.78	T;T
M_CAP	Benign	0.0023	T
MetaRNN	Benign	0.053	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N;.
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-1.1	N;N
REVEL	Benign	0.025
Sift	Uncertain	0.018	D;T
Sift4G	Benign	0.081	T;T
Polyphen		0.13	B;.
Vest4		0.20
MVP		0.19
MPC		0.18
ClinPred		0.016	T
GERP RS		2.5
Varity_R		0.074
gMVP		0.039

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs142936222; hg19: chr8-79648740;