NM_000455.5:c.85A>T

Variant names:

• chr19-1206998-A-T
• rs864622719
• NM_000455.5:c.85A>T

Variant summary

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

The NM_000455.5(STK11):​c.85A>T​(p.Ile29Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,386 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: STK11 NM_000455.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• 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]

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 rank	MANE	Protein	UniProt
STK11	NM_000455.5	c.85A>T	p.Ile29Phe	missense_variant	Exon 1 of 10	ENST00000326873.12	NP_000446.1
STK11	NM_001407255.1	c.85A>T	p.Ile29Phe	missense_variant	Exon 1 of 9		NP_001394184.1
STK11	NR_176325.1	n.1221A>T		non_coding_transcript_exon_variant	Exon 1 of 11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
STK11	ENST00000326873.12	c.85A>T	p.Ile29Phe	missense_variant	Exon 1 of 10	1	NM_000455.5	ENSP00000324856.6
STK11	ENST00000652231.1	c.85A>T	p.Ile29Phe	missense_variant	Exon 1 of 9			ENSP00000498804.1
STK11	ENST00000585748.3	c.-82-11419A>T		intron_variant	Intron 3 of 11	3		ENSP00000477641.2
STK11	ENST00000593219.5	n.85A>T		non_coding_transcript_exon_variant	Exon 1 of 4	3		ENSP00000466610.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461386 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 726956

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Peutz-Jeghers syndrome Uncertain:1

Oct 31, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine with phenylalanine at codon 29 of the STK11 protein (p.Ile29Phe). The isoleucine residue is highly conserved and there is a small physicochemical difference between isoleucine and phenylalanine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with STK11-related disease. ClinVar contains an entry for this variant (Variation ID: 221001). Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). 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

Jun 12, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.I29F variant (also known as c.85A>T), located in coding exon 1 of the STK11 gene, results from an A to T substitution at nucleotide position 85. The isoleucine at codon 29 is replaced by phenylalanine, 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	0.95
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.060
CADD	Pathogenic	27
DANN	Uncertain	0.98
DEOGEN2	Benign	0.37	T;D;T
Eigen	Benign	0.024
Eigen_PC	Benign	0.14
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.94	D;D;D
M_CAP	Pathogenic	0.29	D
MetaRNN	Uncertain	0.57	D;D;D
MetaSVM	Uncertain	-0.013	T
MutationAssessor	Uncertain	2.0	.;M;.
PrimateAI	Pathogenic	0.90	D
PROVEAN	Uncertain	-2.8	.;D;.
REVEL	Uncertain	0.42
Sift	Benign	0.093	.;T;.
Sift4G	Benign	0.067	T;T;T
Polyphen		0.022	.;B;.
Vest4		0.68
MutPred		0.44		Loss of stability (P = 0.0807);Loss of stability (P = 0.0807);Loss of stability (P = 0.0807);
MVP		0.67
MPC		2.4
ClinPred		0.96	D
GERP RS		3.9
Varity_R		0.47
gMVP		0.83

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: rs864622719; hg19: chr19-1206997;