rs753451294

Positions:

• chr5-35857058-T-A
• chr5-35857058-T-C

Variant summary

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

The NM_002185.5(IL7R):​c.81T>A​(p.Asn27Lys) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000419 in 1,430,844 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/23 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: 0.0000042 (0 hom.)
• Consequence: IL7R NM_002185.5 missense, splice_region
• Scores: Splicing: ADA: 0.01112
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.196

Genes affected

IL7R (HGNC:6024): (interleukin 7 receptor) The protein encoded by this gene is a receptor for interleukin 7 (IL7). The function of this receptor requires the interleukin 2 receptor, gamma chain (IL2RG), which is a common gamma chain shared by the receptors of various cytokines, including interleukins 2, 4, 7, 9, and 15. This protein has been shown to play a critical role in V(D)J recombination during lymphocyte development. Defects in this gene may be associated with severe combined immunodeficiency (SCID). Alternatively spliced transcript variants have been found. [provided by RefSeq, Dec 2015]

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=0.17870423).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IL7R	NM_002185.5	c.81T>A	p.Asn27Lys	missense_variant, splice_region_variant	1/8	ENST00000303115.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IL7R	ENST00000303115.8	c.81T>A	p.Asn27Lys	missense_variant, splice_region_variant	1/8	1	NM_002185.5	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000282 AC: 7 AN: 248396 Hom.: 0 AF XY: 0.0000223 AC XY: 3 AN XY: 134536

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000202

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: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000419 AC: 6 AN: 1430844 Hom.: 0 Cov.: 25 AF XY: 0.00000420 AC XY: 3 AN XY: 713978

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000134

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ExAC AF: 0.0000247 AC: 3

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Immunodeficiency 104 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 28, 2021

This sequence change replaces asparagine with lysine at codon 27 of the IL7R protein (p.Asn27Lys). The asparagine residue is moderately conserved and there is a moderate physicochemical difference between asparagine and lysine. This variant is present in population databases (rs753451294, ExAC 0.03%). This variant has not been reported in the literature in individuals affected with IL7R-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; 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. 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	0.46
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	18
DANN	Uncertain	0.99
DEOGEN2	Benign	0.28	.;.;T;.;.
Eigen	Benign	0.15
Eigen_PC	Benign	0.20
FATHMM_MKL	Benign	0.37	N
LIST_S2	Benign	0.75	T;T;T;T;T
M_CAP	Benign	0.030	D
MetaRNN	Benign	0.18	T;T;T;T;T
MetaSVM	Benign	-0.45	T
MutationAssessor	Uncertain	2.5	.;.;M;M;.
MutationTaster	Benign	0.61	N;N;N;N
PrimateAI	Uncertain	0.51	T
PROVEAN	Uncertain	-3.5	D;D;N;N;D
REVEL	Benign	0.18
Sift	Uncertain	0.018	D;D;D;D;D
Sift4G	Uncertain	0.023	D;D;D;D;D
Polyphen		0.84	.;.;P;.;.
Vest4		0.34, 0.24, 0.34
MutPred		0.24		Gain of ubiquitination at N27 (P = 0.0077);Gain of ubiquitination at N27 (P = 0.0077);Gain of ubiquitination at N27 (P = 0.0077);Gain of ubiquitination at N27 (P = 0.0077);Gain of ubiquitination at N27 (P = 0.0077);
MVP		0.88
MPC		0.081
ClinPred		0.48	T
GERP RS		4.6
Varity_R		0.13
gMVP		0.45

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.011
dbscSNV1_RF	Benign	0.22
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: rs753451294; hg19: chr5-35857160;