NM_000455.5:c.1259C>A

Variant names:

• chr19-1226604-C-A
• rs369033659
• NM_000455.5:c.1259C>A

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_000455.5(STK11):​c.1259C>A​(p.Ala420Asp) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign 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. A420S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: STK11 NM_000455.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.76
• Publications: 2 publications found

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 Gene-Disease associations (from GenCC):

• familial pancreatic carcinoma

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• Peutz-Jeghers syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Orphanet, Genomics England PanelApp, G2P
• familial ovarian cancer

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.26975095).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000455.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	STK11	NM_000455.5	MANE Select	c.1259C>A	p.Ala420Asp	missense	Exon 9 of 10	NP_000446.1
	STK11	NR_176325.1		n.2526C>A		non_coding_transcript_exon	Exon 10 of 11

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	STK11	ENST00000326873.12	TSL:1 MANE Select	c.1259C>A	p.Ala420Asp	missense	Exon 9 of 10	ENSP00000324856.6
	STK11	ENST00000585748.3	TSL:3	c.887C>A	p.Ala296Asp	missense	Exon 11 of 12	ENSP00000477641.2
	STK11	ENST00000593219.6	TSL:3	n.*1084C>A		non_coding_transcript_exon	Exon 10 of 11	ENSP00000466610.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Dec 08, 2022

Institute for Biomarker Research, Medical Diagnostic Laboratories, L.L.C.

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Peutz-Jeghers syndrome Uncertain:1

Aug 19, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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) performed at Invitae indicates that this missense variant is not expected to disrupt STK11 protein function. This variant has not been reported in the literature in individuals with STK11-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the ExAC database. This sequence change replaces alanine with aspartic acid at codon 420 of the STK11 protein (p.Ala420Asp). The alanine residue is weakly conserved and there is a moderate physicochemical difference between alanine and aspartic acid.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.29
BayesDel_addAF	Benign	-0.0049	T
BayesDel_noAF	Benign	-0.24
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.29	T
Eigen	Benign	-0.21
Eigen_PC	Benign	-0.20
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Benign	0.34	T
M_CAP	Benign	0.058	D
MetaRNN	Benign	0.27	T
MetaSVM	Benign	-0.76	T
MutationAssessor	Benign	1.6	L
PhyloP100		5.8
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.13
Sift	Uncertain	0.016	D
Sift4G	Benign	0.30	T
Polyphen		0.18	B
Vest4		0.48
MutPred		0.32		Gain of solvent accessibility (P = 0.0354)
MVP		0.49
MPC		0.063
ClinPred		0.58	D
GERP RS		2.2
Varity_R		0.32
gMVP		0.39
Mutation Taster		=86/14	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs369033659; hg19: chr19-1226603;