12-68225692-T-G

Position:

• chr12-68225692-T-G

Variant summary

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

The NM_018402.2(IL26):​c.65A>C​(p.Lys22Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/21 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)
• Consequence: IL26 NM_018402.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.237

Genes affected

IL26 (HGNC:17119): (interleukin 26) This gene was identified by its overexpression specifically in herpesvirus samimiri-transformed T cells. The encoded protein is a member of the IL10 family of cytokines. It is a secreted protein and may function as a homodimer. This protein is thought to contribute to the transformed phenotype of T cells after infection by herpesvirus samimiri. [provided by RefSeq, Jul 2008]

IFNG-AS1 (HGNC:43910): (IFNG antisense RNA 1)

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=0.06427318).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IL26	NM_018402.2	c.65A>C	p.Lys22Thr	missense_variant	1/5	ENST00000229134.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IL26	ENST00000229134.5	c.65A>C	p.Lys22Thr	missense_variant	1/5	1	NM_018402.2	P1
IFNG-AS1	ENST00000536914.1	n.337-8837T>G		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

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

Apr 01, 2024

The c.65A>C (p.K22T) alteration is located in exon 1 (coding exon 1) of the IL26 gene. This alteration results from a A to C substitution at nucleotide position 65, causing the lysine (K) at amino acid position 22 to be replaced by a threonine (T). 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	0.11
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.47
CADD	Benign	12
DANN	Benign	0.94
DEOGEN2	Benign	0.13	T
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.077	N
LIST_S2	Benign	0.56	T
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.064	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.8	L
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-0.75	N
REVEL	Benign	0.034
Sift	Benign	0.054	T
Sift4G	Benign	0.18	T
Polyphen		0.0010	B
Vest4		0.13
MutPred		0.43		Loss of methylation at K22 (P = 0.0089);
MVP		0.38
MPC		0.059
ClinPred		0.037	T
GERP RS		-2.9
Varity_R		0.071
gMVP		0.29

Splicing

Name	Calibrated prediction	Score	Prediction
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: rs1685397878; hg19: chr12-68619472;