rs17857517

chr10-30316175-A-Cchr10-30316175-A-Gchr10-30316175-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_018109.4(MTPAP):c.1255T>G(p.Cys419Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C419Y) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 31)
• Consequence: MTPAP NM_018109.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.11

Genes affected

MTPAP (HGNC:25532): (mitochondrial poly(A) polymerase) The protein encoded by this gene is a member of the DNA polymerase type-B-like family. This enzyme synthesizes the 3' poly(A) tail of mitochondrial transcripts and plays a role in replication-dependent histone mRNA degradation.[provided by RefSeq, Jan 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.817

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MTPAP	NM_018109.4	c.1255T>G	p.Cys419Gly	missense_variant	7/9	ENST00000263063.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MTPAP	ENST00000263063.9	c.1255T>G	p.Cys419Gly	missense_variant	7/9	1	NM_018109.4	P1
MTPAP	ENST00000488290.5	n.3010T>G		non_coding_transcript_exon_variant	15/17	2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Athena Diagnostics

Jun 28, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.41
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.25
Cadd	Pathogenic	28
Dann	Uncertain	0.99
DEOGEN2	Benign	0.24	T
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.92
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Benign	0.84	T
M_CAP	Benign	0.025	T
MetaRNN	Pathogenic	0.82	D
MetaSVM	Uncertain	-0.16	T
MutationAssessor	Pathogenic	3.5	H
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.56	T
PROVEAN	Pathogenic	-10	D
REVEL	Uncertain	0.59
Sift	Uncertain	0.0090	D
Sift4G	Benign	0.085	T
Polyphen		1.0	D
Vest4		0.92
MutPred		0.52		Loss of stability (P = 0.0201);
MVP		0.74
MPC		1.3
ClinPred		1.0	D
GERP RS		6.2
Varity_R		0.84
gMVP		0.87

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs17857517; hg19: chr10-30605104;