19-1223079-C-T

Position:

• chr19-1223079-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_000455.5(STK11):​c.1015C>T​(p.Pro339Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000687 in 1,456,524 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. P339P) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: STK11 NM_000455.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 7.60

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 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.783

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
STK11	NM_000455.5	c.1015C>T	p.Pro339Ser	missense_variant	8/10	ENST00000326873.12	NP_000446.1
STK11	NM_001407255.1	c.1015C>T	p.Pro339Ser	missense_variant	8/9		NP_001394184.1
STK11	NR_176325.1	n.2282C>T		non_coding_transcript_exon_variant	9/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
STK11	ENST00000326873.12	c.1015C>T	p.Pro339Ser	missense_variant	8/10	1	NM_000455.5	ENSP00000324856.6
STK11	ENST00000652231.1	c.1015C>T	p.Pro339Ser	missense_variant	8/9			ENSP00000498804.1
STK11	ENST00000585748.3	c.643C>T	p.Pro215Ser	missense_variant	10/12	3		ENSP00000477641.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.87e-7 AC: 1 AN: 1456524 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 724052

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000226

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.: 33

Bravo AF: 0.00000378

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

Oct 27, 2023

This sequence change replaces proline, which is neutral and non-polar, with serine, which is neutral and polar, at codon 339 of the STK11 protein (p.Pro339Ser). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with STK11-related conditions. ClinVar contains an entry for this variant (Variation ID: 1380310). 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. 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. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 27, 2024

The p.P339S variant (also known as c.1015C>T), located in coding exon 8 of the STK11 gene, results from a C to T substitution at nucleotide position 1015. The proline at codon 339 is replaced by serine, an amino acid with 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	0.58
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.41	T;D
Eigen	Uncertain	0.28
Eigen_PC	Uncertain	0.24
FATHMM_MKL	Benign	0.66	D
LIST_S2	Uncertain	0.97	D;D
M_CAP	Uncertain	0.12	D
MetaRNN	Pathogenic	0.78	D;D
MetaSVM	Benign	-0.42	T
MutationAssessor	Benign	2.0	.;M
PrimateAI	Uncertain	0.76	T
PROVEAN	Pathogenic	-5.7	.;D
REVEL	Uncertain	0.39
Sift	Uncertain	0.0070	.;D
Sift4G	Benign	0.088	T;T
Polyphen		0.81	.;P
Vest4		0.82
MutPred		0.35		Loss of loop (P = 0.0022);Loss of loop (P = 0.0022);
MVP		0.59
MPC		0.22
ClinPred		0.99	D
GERP RS		3.8
Varity_R		0.80
gMVP		0.59

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs769644352; hg19: chr19-1223078;