1-46361823-T-A

Position:

• chr1-46361823-T-A

Variant summary

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

The NM_199044.4(NSUN4):​c.1132T>A​(p.Cys378Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,461,850 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: NSUN4 NM_199044.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.33

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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NSUN4	NM_199044.4	c.1132T>A	p.Cys378Ser	missense_variant	6/6	ENST00000474844.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NSUN4	ENST00000474844.6	c.1132T>A	p.Cys378Ser	missense_variant	6/6	1	NM_199044.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000159 AC: 4 AN: 251212 Hom.: 0 AF XY: 0.0000147 AC XY: 2 AN XY: 135792

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000116

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461850 Hom.: 0 Cov.: 33 AF XY: 0.00000275 AC XY: 2 AN XY: 727230

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000894

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: 0.00

GnomAD4 genome Cov.: 32

ExAC AF: 0.0000165 AC: 2

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

Sep 16, 2021

The c.1132T>A (p.C378S) alteration is located in exon 6 (coding exon 6) of the NSUN4 gene. This alteration results from a T to A substitution at nucleotide position 1132, causing the cysteine (C) at amino acid position 378 to be replaced by a serine (S). 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	Pathogenic	0.59
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.35
CADD	Uncertain	24
DANN	Uncertain	0.98
DEOGEN2	Benign	0.080	T;.
Eigen	Uncertain	0.28
Eigen_PC	Uncertain	0.34
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Benign	0.83	T;T
M_CAP	Benign	0.011	T
MetaRNN	Uncertain	0.62	D;D
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.0	M;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.62	T
PROVEAN	Pathogenic	-8.2	D;D
REVEL	Benign	0.26
Sift	Benign	0.14	T;T
Sift4G	Benign	0.13	T;T
Polyphen		0.72	P;.
Vest4		0.53
MutPred		0.77		Gain of disorder (P = 0.0018);.;
MVP		0.63
MPC		0.84
ClinPred		0.48	T
GERP RS		5.3
Varity_R		0.86
gMVP		0.88

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: rs762756406; hg19: chr1-46827495;