Variant summary

Our verdict is Benign. The variant received -19 ACMG points: 0P and 19B. BP4_ModerateBP6_Very_StrongBP7BS1BS2

The NM_017755.6(NSUN2):c.222C>T(p.Leu74Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00246 in 1,614,184 control chromosomes in the GnomAD database, including 9 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. L74L) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0015 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0026 ( 9 hom. )

Consequence

NSUN2
NM_017755.6 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: 0.205

Publications

2 publications found

Variant links:

Genes affected

NSUN2 (HGNC:25994): (NOP2/Sun RNA methyltransferase 2) This gene encodes a methyltransferase that catalyzes the methylation of cytosine to 5-methylcytosine (m5C) at position 34 of intron-containing tRNA(Leu)(CAA) precursors. This modification is necessary to stabilize the anticodon-codon pairing and correctly translate the mRNA. Alternatively spliced transcript variants encoding different isoforms have been noted for this gene.[provided by RefSeq, Mar 2011]

NSUN2 Gene-Disease associations (from GenCC):

intellectual disability, autosomal recessive 5
Inheritance: AR Classification: STRONG, MODERATE Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
autosomal recessive non-syndromic intellectual disability
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Dubowitz syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
RASopathy
Inheritance: AR Classification: NO_KNOWN Submitted by: ClinGen

NSUN2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -19 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.44).

BP6

Variant 5-6632631-G-A is Benign according to our data. Variant chr5-6632631-G-A is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 211758.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=0.205 with no splicing effect.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00154 (234/152320) while in subpopulation NFE AF = 0.00275 (187/68038). AF 95% confidence interval is 0.00243. There are 0 homozygotes in GnomAd4. There are 111 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 9 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017755.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
NSUN2	NM_017755.6	MANE Select	c.222C>T	p.Leu74Leu	synonymous	Exon 2 of 19	NP_060225.4
NSUN2	NM_001193455.2		c.222C>T	p.Leu74Leu	synonymous	Exon 2 of 18	NP_001180384.1
NSUN2	NR_037947.2		n.287C>T		non_coding_transcript_exon	Exon 2 of 18

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
NSUN2	ENST00000264670.11	TSL:1 MANE Select	c.222C>T	p.Leu74Leu	synonymous	Exon 2 of 19	ENSP00000264670.6
NSUN2	ENST00000506139.5	TSL:2	c.222C>T	p.Leu74Leu	synonymous	Exon 2 of 18	ENSP00000420957.1
NSUN2	ENST00000504374.5	TSL:2	n.222C>T		non_coding_transcript_exon	Exon 2 of 18	ENSP00000421783.1

Frequencies

GnomAD3 genomes

AF:

0.00154

AC:

234

AN:

152202

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000338

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00111

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000621

Gnomad FIN

AF:

0.00113

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00275

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.00195

AC:

489

AN:

251316

AF XY:

0.00209

show subpopulations

Gnomad AFR exome

AF:

0.000246

Gnomad AMR exome

AF:

0.000665

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00176

Gnomad NFE exome

AF:

0.00351

Gnomad OTH exome

AF:

0.00130

GnomAD4 exome

AF:

0.00256

AC:

3740

AN:

1461864

Hom.:

Cov.:

AF XY:

0.00251

AC XY:

1824

AN XY:

727232

show subpopulations

African (AFR)

AF:

0.000388

AC:

AN:

33480

American (AMR)

AF:

0.000604

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39696

South Asian (SAS)

AF:

0.000475

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00215

AC:

115

AN:

53414

Middle Eastern (MID)

AF:

0.000173

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00306

AC:

3400

AN:

1112002

Other (OTH)

AF:

0.00235

AC:

142

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

197

395

592

790

987

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

128

256

384

512

640

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00154

AC:

234

AN:

152320

Hom.:

Cov.:

AF XY:

0.00149

AC XY:

111

AN XY:

74472

show subpopulations

African (AFR)

AF:

0.000337

AC:

AN:

41576

American (AMR)

AF:

0.00111

AC:

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5174

South Asian (SAS)

AF:

0.000622

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00113

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00275

AC:

187

AN:

68038

Other (OTH)

AF:

0.000473

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.509

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00254

Hom.:

Bravo

AF:

0.00158

EpiCase

AF:

0.00278

EpiControl

AF:

0.00237

ClinVar

ClinVar submissions as Germline

Significance:Benign/Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (3)

Inborn genetic diseases (1)

Intellectual disability, autosomal recessive 5 (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.44

CADD

Benign

(source)

DANN

Benign

0.87

PhyloP100

0.20

PromoterAI

0.21

Neutral

(source)

Mutation Taster

=294/6

polymorphism

(source)

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

rs138716662

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over