rs1555738219

Variant names:

• chr19-1220431-A-AAGGACATC
• rs1555738219
• NM_000455.5:c.525_532dupGGACATCA

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000455.5(STK11):​c.525_532dupGGACATCA​(p.Lys178ArgfsTer112) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. K178K) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: STK11 NM_000455.5 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.20
• Publications: 0 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: Pathogenic. The variant received 12 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
• PP5: Variant 19-1220431-A-AAGGACATC is Pathogenic according to our data. Variant chr19-1220431-A-AAGGACATC is described in ClinVar as Pathogenic. ClinVar VariationId is 458050.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
STK11	NM_000455.5	c.525_532dupGGACATCA	p.Lys178ArgfsTer112	frameshift_variant	Exon 4 of 10	ENST00000326873.12	NP_000446.1
STK11	NM_001407255.1	c.525_532dupGGACATCA	p.Lys178ArgfsTer112	frameshift_variant	Exon 4 of 9		NP_001394184.1
STK11	NR_176325.1	n.1792_1799dupGGACATCA		non_coding_transcript_exon_variant	Exon 5 of 11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
STK11	ENST00000326873.12	c.525_532dupGGACATCA	p.Lys178ArgfsTer112	frameshift_variant	Exon 4 of 10	1	NM_000455.5	ENSP00000324856.6
STK11	ENST00000652231.1	c.525_532dupGGACATCA	p.Lys178ArgfsTer112	frameshift_variant	Exon 4 of 9			ENSP00000498804.1
STK11	ENST00000585748.3	c.153_160dupGGACATCA	p.Lys54ArgfsTer112	frameshift_variant	Exon 6 of 12	3		ENSP00000477641.2
STK11	ENST00000593219.6	n.*350_*357dupGGACATCA		non_coding_transcript_exon_variant	Exon 5 of 11	3		ENSP00000466610.1
STK11	ENST00000593219.6	n.*350_*357dupGGACATCA		3_prime_UTR_variant	Exon 5 of 11	3		ENSP00000466610.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Peutz-Jeghers syndrome Pathogenic:1

Mar 15, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

While this particular variant has not been reported in the literature, loss-of-function variants in STK11 are known to be pathogenic (PMID: 15188174, 16287113). For these reasons, this variant has been classified as Pathogenic. This sequence change inserts 8 nucleotides in exon 4 of the STK11 mRNA (c.525_532dupGGACATCA), causing a frameshift at codon 178. This creates a premature translational stop signal (p.Lys178Argfs*112) and is expected to result in an absent or disrupted protein product. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		9.2
Mutation Taster		=2/198	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs1555738219; hg19: chr19-1220430;