5-160424256-A-C

Position:

• chr5-160424256-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_004219.4(PTTG1):​c.296A>C​(p.Lys99Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000657 in 152,238 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 33)
• Consequence: PTTG1 NM_004219.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.18

Genes affected

PTTG1 (HGNC:9690): (PTTG1 regulator of sister chromatid separation, securin) The encoded protein is a homolog of yeast securin proteins, which prevent separins from promoting sister chromatid separation. It is an anaphase-promoting complex (APC) substrate that associates with a separin until activation of the APC. The gene product has transforming activity in vitro and tumorigenic activity in vivo, and the gene is highly expressed in various tumors. The gene product contains 2 PXXP motifs, which are required for its transforming and tumorigenic activities, as well as for its stimulation of basic fibroblast growth factor expression. It also contains a destruction box (D box) that is required for its degradation by the APC. The acidic C-terminal region of the encoded protein can act as a transactivation domain. The gene product is mainly a cytosolic protein, although it partially localizes in the nucleus. Three transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Sep 2013]

PTTG1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.14715695).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PTTG1	NM_004219.4	c.296A>C	p.Lys99Thr	missense_variant	4/6	ENST00000352433.10	NP_004210.1
PTTG1	NM_001282382.1	c.296A>C	p.Lys99Thr	missense_variant	3/5		NP_001269311.1
PTTG1	NM_001282383.1	c.296A>C	p.Lys99Thr	missense_variant	4/6		NP_001269312.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PTTG1	ENST00000352433.10	c.296A>C	p.Lys99Thr	missense_variant	4/6	1	NM_004219.4	ENSP00000344936.5

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152238 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 30

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152238 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 74374

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.0000654

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 19, 2024

The c.296A>C (p.K99T) alteration is located in exon 4 (coding exon 3) of the PTTG1 gene. This alteration results from a A to C substitution at nucleotide position 296, causing the lysine (K) at amino acid position 99 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.40
CADD	Benign	19
DANN	Benign	0.93
DEOGEN2	Benign	0.14	T;T;T;T
Eigen	Benign	-0.55
Eigen_PC	Benign	-0.54
FATHMM_MKL	Benign	0.22	N
LIST_S2	Benign	0.79	.;T;.;T
M_CAP	Benign	0.029	D
MetaRNN	Benign	0.15	T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.3	M;.;M;M
PrimateAI	Benign	0.46	T
PROVEAN	Uncertain	-2.5	D;D;D;D
REVEL	Benign	0.047
Sift	Benign	0.078	T;T;T;T
Sift4G	Benign	0.19	T;T;T;T
Polyphen		0.064	B;.;B;B
Vest4		0.21
MutPred		0.53		Loss of methylation at K99 (P = 0.0098);.;Loss of methylation at K99 (P = 0.0098);Loss of methylation at K99 (P = 0.0098);
MVP		0.59
MPC		0.42
ClinPred		0.20	T
GERP RS		2.5
Varity_R		0.066
gMVP		0.21

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: rs1765769154; hg19: chr5-159851263;