16-67657628-C-A

Position:

• chr16-67657628-C-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001082486.2(ACD):​c.1355G>T​(p.Gly452Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: ACD NM_001082486.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.376

Genes affected

ACD (HGNC:25070): (ACD shelterin complex subunit and telomerase recruitment factor) This gene encodes a protein that is involved in telomere function. This protein is one of six core proteins in the telosome/shelterin telomeric complex, which functions to maintain telomere length and to protect telomere ends. Through its interaction with other components, this protein plays a key role in the assembly and stabilization of this complex, and it mediates the access of telomerase to the telomere. Multiple transcript variants encoding different isoforms have been found for this gene. This gene, which is also referred to as TPP1, is distinct from the unrelated TPP1 gene on chromosome 11, which encodes tripeptidyl-peptidase I. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.039591312).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ACD	NM_001082486.2	c.1355G>T	p.Gly452Val	missense_variant	12/12	ENST00000620761.6	NP_001075955.2
ACD	NM_022914.3	c.1346G>T	p.Gly449Val	missense_variant	12/12		NP_075065.3
ACD	NM_001410884.1	c.1268G>T	p.Gly423Val	missense_variant	11/11		NP_001397813.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ACD	ENST00000620761.6	c.1355G>T	p.Gly452Val	missense_variant	12/12	1	NM_001082486.2	ENSP00000478084	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000468 Hom.: 0

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 24, 2022

The p.G538V variant (also known as c.1613G>T), located in coding exon 12 of the ACD gene, results from a G to T substitution at nucleotide position 1613. The glycine at codon 538 is replaced by valine, an amino acid with dissimilar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.083
BayesDel_addAF	Benign	-0.31	T
BayesDel_noAF	Benign	-0.68
CADD	Benign	2.0
DANN	Benign	0.77
DEOGEN2	Benign	0.29	.;T;T;T;T;.
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.075	N
LIST_S2	Benign	0.30	T;T;.;T;T;.
M_CAP	Benign	0.0090	T
MetaRNN	Benign	0.040	T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.69	.;N;.;.;.;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.34	T
REVEL	Benign	0.035
Sift4G	Uncertain	0.054	.;T;D;.;D;.
Polyphen		0.0, 0.0010	.;B;.;.;.;B
Vest4		0.078, 0.073, 0.094
MVP		0.32
MPC		0.12
ClinPred		0.036	T
GERP RS		3.1
Varity_R		0.032
gMVP		0.086

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs2052894796; hg19: chr16-67691531;