10-87863549-G-A

Position:

• chr10-87863549-G-A

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP6

The ENST00000693560.1(PTEN):​c.-401G>A variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000906 in 386,238 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00011 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000081 (0 hom.)
• Consequence: PTEN ENST00000693560.1 5_prime_UTR
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:3
• Conservation: PhyloP100: 0.568

Genes affected

PTEN (HGNC:9588): (phosphatase and tensin homolog) This gene was identified as a tumor suppressor that is mutated in a large number of cancers at high frequency. The protein encoded by this gene is a phosphatidylinositol-3,4,5-trisphosphate 3-phosphatase. It contains a tensin like domain as well as a catalytic domain similar to that of the dual specificity protein tyrosine phosphatases. Unlike most of the protein tyrosine phosphatases, this protein preferentially dephosphorylates phosphoinositide substrates. It negatively regulates intracellular levels of phosphatidylinositol-3,4,5-trisphosphate in cells and functions as a tumor suppressor by negatively regulating AKT/PKB signaling pathway. The use of a non-canonical (CUG) upstream initiation site produces a longer isoform that initiates translation with a leucine, and is thought to be preferentially associated with the mitochondrial inner membrane. This longer isoform may help regulate energy metabolism in the mitochondria. A pseudogene of this gene is found on chromosome 9. Alternative splicing and the use of multiple translation start codons results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Feb 2015]

KLLN (HGNC:37212): (killin, p53 regulated DNA replication inhibitor) The protein encoded by this intronless gene is found in the nucleus, where it can inhibit DNA synthesis and promote S phase arrest coupled to apoptosis. The expression of this DNA binding protein is upregulated by transcription factor p53. [provided by RefSeq, Dec 2012]

(HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.38).
• BP6: Variant 10-87863549-G-A is Benign according to our data. Variant chr10-87863549-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 189492.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=2, Likely_benign=3}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KLLN	NM_001126049.2			upstream_gene_variant		ENST00000445946.5	NP_001119521.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PTEN	ENST00000693560.1	c.-401G>A		5_prime_UTR_variant	1/10			ENSP00000509861
PTEN	ENST00000688308.1	c.-17+436G>A		intron_variant				ENSP00000508752	P1
KLLN	ENST00000445946.5			upstream_gene_variant			NM_001126049.2	ENSP00000392204	P1
	ENST00000692337.1			upstream_gene_variant				ENSP00000509326	P1

Frequencies

GnomAD3 genomes AF: 0.000105 AC: 16 AN: 152038 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000656

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000849

Gnomad MID AF: 0.00318

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.000958

GnomAD4 exome AF: 0.0000811 AC: 19 AN: 234200 Hom.: 0 Cov.: 0 AF XY: 0.0000924 AC XY: 11 AN XY: 119058

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: 0.000436

Gnomad4 NFE exome AF: 0.0000467

Gnomad4 OTH exome AF: 0.0000650

GnomAD4 genome AF: 0.000105 AC: 16 AN: 152038 Hom.: 0 Cov.: 32 AF XY: 0.000162 AC XY: 12 AN XY: 74262

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.0000656

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.000849

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.000958

Bravo AF: 0.0000491

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Feb 01, 2023	PTEN: BP4 -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Oct 05, 2023	Describes a nucleotide substitution 921 basepairs upstream of the ATG translational start site in the PTEN promoter region; Observed in at least one individual with breast cancer (Guindalini et al., 2022); A different variant at the same position, published as c.-920G>T, was observed in a patient with features of Cowden syndrome and was reported to alter a putative Sp1 transcription factor binding site (Zhou et al., 2003); Also known as c.-920G>A; This variant is associated with the following publications: (PMID: 27720647, 12844284, 35264596) -

PTEN hamartoma tumor syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Mendelics

Jul 02, 2018

- -

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Nov 25, 2022

Variant summary: PTEN c.-921G>A (also known as c.-920G>A in RefSeq) is located in the untranscribed region upstream of the of the PTEN gene. The variant allele was found at a frequency of 9.9e-05 in 150812 control chromosomes, predominantly at a frequency of 0.00085 within the Finnish subpopulation in the gnomAD database (v3.1, genomes dataset). The observed variant frequency within the Finnish European control individuals in the gnomAD database is approximately 136-fold of the estimated maximal expected allele frequency for a pathogenic variant in PTEN causing Cowden Syndrome phenotype (6.3e-06), suggesting that the variant is a benign polymorphism. The variant, c.-921G>A, has been reported in the literature in at least one individual who participated in a multigene hereditary-cancer testing, however no clinical information was provided (Mu_2016). This report does not provide unequivocal conclusions about association of the variant with Cowden Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Three other clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation, and classified the variant as VUS (n=2), or likely benign (n=1). Based on the evidence outlined above, the variant was classified as likely benign. -

Hereditary cancer-predisposing syndrome Benign:1

Likely benign, criteria provided, single submitter

curation

Sema4, Sema4

Dec 07, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.38
CADD	Benign	18
DANN	Benign	0.97

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: rs786204937; hg19: chr10-89623306;