16-721623-G-C

Position:

• chr16-721623-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_023933.3(ANTKMT):​c.188G>C​(p.Arg63Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000079 in 1,393,194 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000079 (0 hom.)
• Consequence: ANTKMT NM_023933.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.16

Genes affected

ANTKMT (HGNC:14152): (adenine nucleotide translocase lysine methyltransferase) Enables protein-lysine N-methyltransferase activity. Involved in peptidyl-lysine trimethylation. Located in mitochondrion. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.29718602).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ANTKMT	NM_023933.3	c.188G>C	p.Arg63Pro	missense_variant	2/5	ENST00000569529.6
ANTKMT	NM_001271285.2	c.188G>C	p.Arg63Pro	missense_variant	2/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ANTKMT	ENST00000569529.6	c.188G>C	p.Arg63Pro	missense_variant	2/5	1	NM_023933.3	P1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 0.00000790 AC: 11 AN: 1393194 Hom.: 0 Cov.: 33 AF XY: 0.0000102 AC XY: 7 AN XY: 687394

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000280

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000928

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

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

Jan 23, 2024

The c.188G>C (p.R63P) alteration is located in exon 2 (coding exon 2) of the FAM173A gene. This alteration results from a G to C substitution at nucleotide position 188, causing the arginine (R) at amino acid position 63 to be replaced by a proline (P). 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	0.26
BayesDel_addAF	Benign	-0.036	T
BayesDel_noAF	Benign	-0.29
CADD	Benign	22
DANN	Uncertain	0.98
DEOGEN2	Benign	0.014	T;T;T
Eigen	Benign	-0.33
Eigen_PC	Benign	-0.21
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Benign	0.61	T;T;T
M_CAP	Benign	0.0073	T
MetaRNN	Benign	0.30	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.2	L;.;.
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Uncertain	0.69	T
PROVEAN	Benign	-1.8	N;N;N
Sift	Benign	0.066	T;T;T
Sift4G	Benign	0.26	T;T;T
Polyphen		0.047	B;.;.
Vest4		0.55
MutPred		0.60		Loss of MoRF binding (P = 0.0123);Loss of MoRF binding (P = 0.0123);Loss of MoRF binding (P = 0.0123);
MVP		0.23
MPC		0.39
ClinPred		0.69	D
GERP RS		2.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.2
Varity_R		0.51
gMVP		0.77

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs911067074; hg19: chr16-771623;