1-46345138-C-A

Position:

• chr1-46345138-C-A

Variant summary

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

The NM_199044.4(NSUN4):​c.431C>A​(p.Pro144His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000138 in 1,447,960 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: NSUN4 NM_199044.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.16

Genes affected

NSUN4 (HGNC:31802): (NOP2/Sun RNA methyltransferase 4) Enables rRNA (cytosine-C5-)-methyltransferase activity. Involved in rRNA methylation. Part of mitochondrial large ribosomal subunit. [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=0.27004382).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NSUN4	NM_199044.4	c.431C>A	p.Pro144His	missense_variant	2/6	ENST00000474844.6	NP_950245.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NSUN4	ENST00000474844.6	c.431C>A	p.Pro144His	missense_variant	2/6	1	NM_199044.4	ENSP00000419740	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000138 AC: 2 AN: 1447960 Hom.: 0 Cov.: 34 AF XY: 0.00000139 AC XY: 1 AN XY: 719458

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00

Gnomad4 OTH exome AF: 0.0000167

GnomAD4 genome Cov.: 32

Asia WGS AF: 0.000289 AC: 1 AN: 3478

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

Nov 07, 2022

The c.431C>A (p.P144H) alteration is located in exon 2 (coding exon 2) of the NSUN4 gene. This alteration results from a C to A substitution at nucleotide position 431, causing the proline (P) at amino acid position 144 to be replaced by a histidine (H). 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	0.15
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.51
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.045	T;.
Eigen	Benign	0.12
Eigen_PC	Benign	0.12
FATHMM_MKL	Uncertain	0.80	D
LIST_S2	Benign	0.85	T;T
M_CAP	Benign	0.010	T
MetaRNN	Benign	0.27	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Pathogenic	3.0	M;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.36	T
PROVEAN	Uncertain	-3.8	D;D
REVEL	Benign	0.084
Sift	Benign	0.074	T;D
Sift4G	Benign	0.12	T;T
Polyphen		0.64	P;.
Vest4		0.15
MutPred		0.44		Loss of catalytic residue at P143 (P = 0.0102);.;
MVP		0.43
MPC		0.49
ClinPred		0.97	D
GERP RS		3.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.66
gMVP		0.41

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: rs1187871967; hg19: chr1-46810810;