19-1226507-A-T

Variant names:

• chr19-1226507-A-T
• rs878853983
• NM_000455.5:c.1162A>T

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_000455.5(STK11):​c.1162A>T​(p.Lys388*) variant causes a stop gained change. 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 (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: STK11 NM_000455.5 stop_gained
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.79

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 Pathogenic. Variant got 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
STK11	NM_000455.5	c.1162A>T	p.Lys388*	stop_gained	Exon 9 of 10	ENST00000326873.12	NP_000446.1
STK11	NR_176325.1	n.2429A>T		non_coding_transcript_exon_variant	Exon 10 of 11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
STK11	ENST00000326873.12	c.1162A>T	p.Lys388*	stop_gained	Exon 9 of 10	1	NM_000455.5	ENSP00000324856.6
STK11	ENST00000585748.3	c.790A>T	p.Lys264*	stop_gained	Exon 11 of 12	3		ENSP00000477641.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Peutz-Jeghers syndrome Uncertain:1

Dec 16, 2015

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, this is a novel truncating variant with uncertain impact on protein function. In the absence of segregation or functional data, it has been classified as a Variant of Uncertain Significance Functional studies regarding the potential impact that this particular truncating variant has on protein function have not been reported.  Although in vivo studies have shown that the STK11 C-terminal end contains amino acids that undergo post-translational modifications (PMID: 24295069), the clinical significance of these findings are unclear. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a STK11-related disease. This sequence change results in a premature translational stop signal in the last coding exon of the STK11 mRNA at codon 388 (p.Lys388*). While this is not anticipated to result in nonsense mediated decay, it is expected to create a truncated STK11 protein. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.57
CADD	Pathogenic	46
DANN	Uncertain	1.0
Eigen	Pathogenic	0.79
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Uncertain	0.95	D
Vest4		0.85
GERP RS		4.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs878853983; hg19: chr19-1226506;