rs1555734913

Positions:

• chr19-1206989-A-G

Variant summary

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

The NM_000455.5(STK11):​c.76A>G​(p.Ile26Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: STK11 NM_000455.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 8.82

Genes affected

STK11 (HGNC:11389): (serine/threonine kinase 11) The protein encoded by this gene is a serine/threonine kinase that regulates cell polarity and energy metabolism and functions as a tumor suppressor. Mutations in this gene have been associated with the autosomal dominant Peutz-Jeghers syndrome, as well as with skin, pancreatic, and testicular cancers. [provided by RefSeq, May 2022]

STK11 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
STK11	NM_000455.5	c.76A>G	p.Ile26Val	missense_variant	1/10	ENST00000326873.12	NP_000446.1
STK11	NM_001407255.1	c.76A>G	p.Ile26Val	missense_variant	1/9		NP_001394184.1
STK11	NR_176325.1	n.1212A>G		non_coding_transcript_exon_variant	1/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
STK11	ENST00000326873.12	c.76A>G	p.Ile26Val	missense_variant	1/10	1	NM_000455.5	ENSP00000324856.6
STK11	ENST00000652231.1	c.76A>G	p.Ile26Val	missense_variant	1/9			ENSP00000498804.1
STK11	ENST00000585748.3	c.-82-11428A>G		intron_variant		3		ENSP00000477641.2
STK11	ENST00000593219.5	n.76A>G		non_coding_transcript_exon_variant	1/4	3		ENSP00000466610.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Peutz-Jeghers syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 25, 2023

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on STK11 protein function. ClinVar contains an entry for this variant (Variation ID: 458063). This variant has not been reported in the literature in individuals affected with STK11-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 26 of the STK11 protein (p.Ile26Val). -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 03, 2020

The p.I26V variant (also known as c.76A>G), located in coding exon 1 of the STK11 gene, results from an A to G substitution at nucleotide position 76. The isoleucine at codon 26 is replaced by valine, an amino acid with highly similar properties. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Uncertain	0.075	D
BayesDel_noAF	Benign	-0.13
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.28	T;T;T
Eigen	Uncertain	0.22
Eigen_PC	Benign	0.19
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.94	D;D;D
M_CAP	Uncertain	0.11	D
MetaRNN	Uncertain	0.48	T;T;T
MetaSVM	Uncertain	-0.16	T
MutationAssessor	Uncertain	2.2	.;M;.
PrimateAI	Pathogenic	0.85	D
PROVEAN	Benign	-0.76	.;N;.
REVEL	Uncertain	0.45
Sift	Benign	0.19	.;T;.
Sift4G	Benign	0.26	T;T;T
Polyphen		0.79	.;P;.
Vest4		0.50
MutPred		0.39		Loss of catalytic residue at I26 (P = 0.1343);Loss of catalytic residue at I26 (P = 0.1343);Loss of catalytic residue at I26 (P = 0.1343);
MVP		0.77
MPC		1.7
ClinPred		0.71	D
GERP RS		1.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7
Varity_R		0.13
gMVP		0.53

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: rs1555734913; hg19: chr19-1206988;