chr19-39243681-A-C

Position:

• chr19-39243681-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_172139.4(IFNL3):​c.542T>G​(p.Leu181Arg) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L181F) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: IFNL3 NM_172139.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.46

Genes affected

IFNL3 (HGNC:18365): (interferon lambda 3) This gene encodes a cytokine distantly related to type I interferons and the IL-10 family. This gene, interleukin 28A (IL28A), and interleukin 29 (IL29) are three closely related cytokine genes that form a cytokine gene cluster on a chromosomal region mapped to 19q13. Expression of the cytokines encoded by the three genes can be induced by viral infection. All three cytokines have been shown to interact with a heterodimeric class II cytokine receptor that consists of interleukin 10 receptor, beta (IL10RB) and interleukin 28 receptor, alpha (IL28RA). [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.898

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IFNL3	NM_172139.4	c.542T>G	p.Leu181Arg	missense_variant	5/5	ENST00000413851.3
IFNL3	NM_001346937.2	c.554T>G	p.Leu185Arg	missense_variant	6/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IFNL3	ENST00000413851.3	c.542T>G	p.Leu181Arg	missense_variant	5/5	1	NM_172139.4	A2
IFNL3	ENST00000613087.5	c.554T>G	p.Leu185Arg	missense_variant	6/6	1		P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

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

Aug 17, 2021

The c.542T>G (p.L181R) alteration is located in exon 5 (coding exon 5) of the IFNL3 gene. This alteration results from a T to G substitution at nucleotide position 542, causing the leucine (L) at amino acid position 181 to be replaced by an arginine (R). 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	Pathogenic	0.70
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.040
CADD	Uncertain	25
DANN	Uncertain	1.0
Eigen	Benign	0.061
Eigen_PC	Benign	-0.18
FATHMM_MKL	Benign	0.57	D
LIST_S2	Uncertain	0.89	D;D
M_CAP	Benign	0.015	T
MetaRNN	Pathogenic	0.90	D;D
MetaSVM	Benign	-0.84	T
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.48	T
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	.;D
Vest4		0.84
MutPred		0.68		.;Loss of stability (P = 0.0055);
MVP		0.36
MPC		0.94
ClinPred		0.99	D
GERP RS		1.7
Varity_R		0.90
gMVP		0.60

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr19-39734321;