NM_006397.3:c.635A>T

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 1P and 0B. PP3

The NM_006397.3(RNASEH2A):c.635A>T(p.Asn212Ile) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.0000775 in 1,613,584 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N212S) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000083 ( 0 hom. )

Consequence

RNASEH2A
NM_006397.3 missense, splice_region

Scores

Splicing: ADA: 0.1191

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts P:1U:2

Conservation

PhyloP100: 5.21

Publications

6 publications found

Variant links:

Genes affected

RNASEH2A (HGNC:18518): (ribonuclease H2 subunit A) The protein encoded by this gene is a component of the heterotrimeric type II ribonuclease H enzyme (RNAseH2). RNAseH2 is the major source of ribonuclease H activity in mammalian cells and endonucleolytically cleaves ribonucleotides. It is predicted to remove Okazaki fragment RNA primers during lagging strand DNA synthesis and to excise single ribonucleotides from DNA-DNA duplexes. Mutations in this gene cause Aicardi-Goutieres Syndrome (AGS), a an autosomal recessive neurological disorder characterized by progressive microcephaly and psychomotor retardation, intracranial calcifications, elevated levels of interferon-alpha and white blood cells in the cerebrospinal fluid.[provided by RefSeq, Aug 2009]

RNASEH2A links:

THSD8 (HGNC:53785): (thrombospondin type 1 domain containing 8)

THSD8 links:

HOOK2 (HGNC:19885): (hook microtubule tethering protein 2) Hook proteins are cytosolic coiled-coil proteins that contain conserved N-terminal domains, which attach to microtubules, and more divergent C-terminal domains, which mediate binding to organelles. The Drosophila Hook protein is a component of the endocytic compartment.[supplied by OMIM, Apr 2004]

HOOK2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.812

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006397.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RNASEH2A	NM_006397.3	MANE Select	c.635A>T	p.Asn212Ile	missense splice_region	Exon 6 of 8	NP_006388.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
RNASEH2A	ENST00000221486.6	TSL:1 MANE Select	c.635A>T	p.Asn212Ile	missense splice_region	Exon 6 of 8	ENSP00000221486.4
RNASEH2A	ENST00000593017.2	TSL:2	n.921A>T		splice_region non_coding_transcript_exon	Exon 4 of 6
THSD8	ENST00000639767.2	TSL:5	n.*514A>T		splice_region non_coding_transcript_exon	Exon 7 of 9	ENSP00000491410.2

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152170

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000282

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000219

AC:

AN:

251418

AF XY:

0.000272

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000831

Gnomad NFE exome

AF:

0.000308

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.0000828

AC:

121

AN:

1461414

Hom.:

Cov.:

AF XY:

0.0000949

AC XY:

AN XY:

727060

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33466

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86248

European-Finnish (FIN)

AF:

0.000711

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000720

AC:

AN:

1111574

Other (OTH)

AF:

0.0000497

AC:

AN:

60384

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.476

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152170

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74336

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41440

American (AMR)

AF:

0.00

AC:

AN:

15274

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.000282

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68030

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.438

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000447

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.000313

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Aicardi-Goutieres syndrome 4

Pathogenic:1Uncertain:1

May 13, 2011

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

Jul 06, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces asparagine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 212 of the RNASEH2A protein (p.Asn212Ile). This variant is present in population databases (rs377244188, gnomAD 0.08%). This missense change has been observed in individual(s) with Aicardi Goutieres syndrome (PMID: 23592335). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 66069). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C15"). Experimental studies are conflicting or provide insufficient evidence to determine the effect of this variant on RNASEH2A function (PMID: 21454563, 31529068). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

not specified

Uncertain:1

May 27, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: RNASEH2A c.635A>T (p.Asn212Ile) results in a non-conservative amino acid change located in the Ribonuclease HII/HIII domain (IPR024567) of the encoded protein sequence. Algorithms developed to predict the effect of missense changes on protein structure and function all suggest that this variant is likely to be disruptive. Consensus agreement among computation tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.00022 in 251418 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in RNASEH2A causing Aicardi Goutieres Syndrome (0.00022 vs 0.00025), allowing no conclusion about variant significance. c.635A>T has been reported in the literature in at least one compound heterozygous individual affected with Aicardi Goutieres Syndrome and heterozygous in affected individuals without a second variant identified (e.g. Rice_2013, Crow_2015). These data do not allow any conclusion about variant significance. At least one publication reports experimental evidence evaluating an impact on protein function, indicating that the variant had no significant impact on catalytic activity, although it did cause a small reduction in substrate binding affinity (Coffin_2011, Nishimura_2019). The following publications have been ascertained in the context of this evaluation (PMID: 21454563, 25604658, 31529068, 23592335). ClinVar contains an entry for this variant (Variation ID: 66069). Based on the evidence outlined above, the variant was classified as uncertain significance.

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.50

BayesDel_addAF

Benign

-0.092

BayesDel_noAF

Uncertain

-0.070

CADD

Uncertain

(source)

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.83

Eigen

Uncertain

0.22

Eigen_PC

Uncertain

0.29

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.99

M_CAP

Uncertain

0.21

MetaRNN

Pathogenic

0.81

MetaSVM

Uncertain

0.045

MutationAssessor

Uncertain

2.2

PhyloP100

5.2

PrimateAI

Benign

0.42

PROVEAN

Pathogenic

-5.1

REVEL

Uncertain

0.56

Sift

Uncertain

0.022

Sift4G

Uncertain

0.0050

Polyphen

0.44

Vest4

0.90

MVP

0.88

MPC

0.86

ClinPred

0.57

GERP RS

4.6

Varity_R

0.83

gMVP

0.89

Mutation Taster

=24/76

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.12

dbscSNV1_RF

Benign

0.32

Splicevardb

2.0

SpliceAI score (max)

0.10

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over