10-87932974-GTTTT-GTTTTTT

Variant names:

• chr10-87932974-G-GTT
• rs77494260
• NM_000314.8:c.254-31_254-30dupTT

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_000314.8(PTEN):​c.254-31_254-30dupTT variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000242 in 1,321,338 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000024 (0 hom.)
• Consequence: PTEN NM_000314.8 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.19
• Publications: 0 publications found

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]

PTEN Gene-Disease associations (from GenCC):

• Cowden syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), G2P
• PTEN hamartoma tumor syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• macrocephaly-autism syndrome

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Genomics England PanelApp, Orphanet
• renal cell carcinoma

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• leiomyosarcoma

  Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp
• activated PI3K-delta syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Bannayan-Riley-Ruvalcaba syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Cowden disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Lhermitte-Duclos disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Proteus-like syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• glioma susceptibility 2

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000314.8. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PTEN	NM_000314.8	MANE Select	c.254-31_254-30dupTT		intron	N/A	NP_000305.3
	PTEN	NM_001304717.5		c.773-31_773-30dupTT		intron	N/A	NP_001291646.4
	PTEN	NM_001304718.2		c.-497-31_-497-30dupTT		intron	N/A	NP_001291647.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PTEN	ENST00000371953.8	TSL:1 MANE Select	c.254-39_254-38insTT		intron	N/A	ENSP00000361021.3
	PTEN	ENST00000693560.1		c.773-39_773-38insTT		intron	N/A	ENSP00000509861.1
	PTEN	ENST00000700029.2		c.254-39_254-38insTT		intron	N/A	ENSP00000514759.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000242 AC: 32 AN: 1321338 Hom.: 0 Cov.: 23 AF XY: 0.0000181 AC XY: 12 AN XY: 664210

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 30474

American (AMR) AF: 0.00 AC: 0 AN: 44078

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25086

East Asian (EAS) AF: 0.00 AC: 0 AN: 38654

South Asian (SAS) AF: 0.0000363 AC: 3 AN: 82752

European-Finnish (FIN) AF: 0.0000191 AC: 1 AN: 52344

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5494

European-Non Finnish (NFE) AF: 0.0000274 AC: 27 AN: 986828

Other (OTH) AF: 0.0000180 AC: 1 AN: 55628

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.2

Splicing

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

Other links and lift over

dbSNP: rs77494260; hg19: chr10-89692731;