rs1248289980

chr19-1222006-G-Achr19-1222006-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP3

The NM_000455.5(STK11):c.920G>A(p.Ser307Asn) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.000000705 in 1,417,480 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. 2/3 splice prediction tools predicting alterations to normal splicing. 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. S307R) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: STK11 NM_000455.5 missense, splice_region
• Scores: Splicing: ADA: 0.9948
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 5.49

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 16 uncertain in NM_000455.5
• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
STK11	NM_000455.5	c.920G>A	p.Ser307Asn	missense_variant, splice_region_variant	7/10	ENST00000326873.12
STK11	NM_001407255.1	c.920G>A	p.Ser307Asn	missense_variant, splice_region_variant	7/9
STK11	NR_176325.1	n.2187G>A		splice_region_variant, non_coding_transcript_exon_variant	8/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
STK11	ENST00000326873.12	c.920G>A	p.Ser307Asn	missense_variant, splice_region_variant	7/10	1	NM_000455.5	P1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 7.05e-7 AC: 1 AN: 1417480 Hom.: 0 Cov.: 30 AF XY: 0.00000143 AC XY: 1 AN XY: 701288

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 9.17e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Peutz-Jeghers syndrome Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 15, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Dec 24, 2021	Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus 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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 527817). 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 serine, which is neutral and polar, with asparagine, which is neutral and polar, at codon 307 of the STK11 protein (p.Ser307Asn). This variant also falls at the last nucleotide of exon 7, which is part of the consensus splice site for this exon. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 23, 2019

The p.S307N variant (also known as c.920G>A), located in coding exon 7 of the STK11 gene, results from a G to A substitution at nucleotide position 920. The amino acid change results in serine to asparagine at codon 307, an amino acid with highly similar properties. However, this change occurs in the last base pair of coding exon 7, which makes it likely to have some effect on normal mRNA splicing. This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Using the BDGP and ESEfinder splice site prediction tools, this alteration is predicted to weaken the efficiency of the native splice donor site; however, direct evidence is unavailable. 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	Benign	0.095
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.39
Cadd	Pathogenic	26
Dann	Benign	0.96
DEOGEN2	Benign	0.25	T;T
Eigen	Benign	-0.16
Eigen_PC	Benign	-0.0088
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Uncertain	0.87	D;D
M_CAP	Benign	0.019	T
MetaRNN	Benign	0.35	T;T
MetaSVM	Benign	-0.70	T
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.62	T
Sift4G	Benign	0.60	T;T
Polyphen		0.0	.;B
Vest4		0.26
MutPred		0.56		Loss of phosphorylation at S307 (P = 0.0189);Loss of phosphorylation at S307 (P = 0.0189);
MVP		0.50
MPC		0.040
ClinPred		0.60	D
GERP RS		3.6
Varity_R		0.20
gMVP		0.12

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	0.99
dbscSNV1_RF	Pathogenic	0.94
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: rs1248289980; hg19: chr19-1222005;