NM_020682.4:c.610+63T>C

Variant names:

• chr10-102877098-T-C
• rs3740392
• NM_020682.4:c.610+63T>C

GermlineCancer (beta)

Variant summary

Our verdict is Likely benign.

-4 Likely Benign

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received -4 classification points (ACGS-UK Somatic Oncogenicity v2025). B1_Strong

The NM_020682.4(AS3MT):c.610+63T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a cumulative frequency of 0.25 (AC=370,792) in the gnomAD database across 1,481,194 control chromosomes, including 47,616 homozygotes. The grpmax filtering allele frequency (95% CI) is 0.313. In-silico predictor (BayesDel (noAF)) classifies this variant as likely benign. Splicing prediction tools (SpliceAI) predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.25 (4724 hom., cov: 32)
  • Exomes 𝑓: 0.25 (42892 hom.)
• Consequence: AS3MT NM_020682.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.31
• Publications: 32 publications found

Genes affected

AS3MT (HGNC:17452): (arsenite methyltransferase) AS3MT catalyzes the transfer of a methyl group from S-adenosyl-L-methionine (AdoMet) to trivalent arsenical and may play a role in arsenic metabolism (Lin et al., 2002 [PubMed 11790780]).[supplied by OMIM, Mar 2008]

BORCS7-ASMT (HGNC:49183): (BORCS7-ASMT readthrough (NMD candidate)) This locus represents naturally occurring read-through transcription between the neighboring C10orf32 (chromosome 10 open reading frame 32) and AS3MT (arsenic, +3 oxidation state, methyltransferase) genes. The read-through transcript is a candidate for nonsense-mediated mRNA decay (NMD), and is therefore unlikely to produce a protein product. [provided by RefSeq, Dec 2010]

Classification according to ACGS-UK Somatic Oncogenicity v2025

Classification was made for transcript:

Our verdict: Likely_benign. The variant received -4 points.

Apply	Criterion Code & Title / Strength	Strength	Rationale / Clinical Context
	B1High frequency in general population		GnomAD effective popmax AF >1% — B1 stand-alone benign; GnomAD effective popmax AF = 0.313 — exceeds 1% threshold (B1 applied)

Variant Effect in Transcripts

Automated classification analysis was done for transcript: NM_020682.4. You can select a different transcript below to see updated classification assignments.

RefSeq Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	AS3MT NM_020682.4	MANE Select	c.610+63T>C	intron	Intron 7 of 10	Prot: NP_065733.2 UniProt:
	BORCS7-ASMT NR_037644.1		n.1015+63T>C	intron	Intron 11 of 14	Prot:

AS3MT NM_020682.4

MANE Select

HGVSc / HGVSpc.610+63T>C

Exon rankIntron 7 of 10

intron

Prot: NP_065733.2UniProt: Q9HBK9-1

BORCS7-ASMT NR_037644.1

HGVSc / HGVSpn.1015+63T>C

Exon rankIntron 11 of 14

intron

Prot:

Ensembl Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	AS3MT ENST00000369880.8	TSL:1MANE Select	c.610+63T>C	intron	Intron 7 of 10	Prot: ENSP00000358896.3 UniProt:
	BORCS7-ASMT ENST00000299353.6	TSL:5	n.*617+63T>C	intron	Intron 11 of 14	Prot: ENSP00000299353.5 UniProt:
	AS3MT ENST00000942423.1		c.595+63T>C	intron	Intron 7 of 10	Prot: ENSP00000612482.1 UniProt:

AS3MT ENST00000369880.8

TSL:1MANE Select

HGVSc / HGVSpc.610+63T>C

Exon rankIntron 7 of 10

intron

Prot: ENSP00000358896.3UniProt: Q9HBK9-1

BORCS7-ASMT ENST00000299353.6

TSL:5

HGVSc / HGVSpn.*617+63T>C

Exon rankIntron 11 of 14

intron

Prot: ENSP00000299353.5UniProt: Q96B45

AS3MT ENST00000942423.1

HGVSc / HGVSpc.595+63T>C

Exon rankIntron 7 of 10

intron

Prot: ENSP00000612482.1UniProt: A0ACI8U690

Frequencies

Allele frequencies (AF), counts (AC/AN), homozygotes and coverage

Common (AF > 0.05 / Hom > 5)

Rare (AF ≤ 0.0001 / Hom ≤ 1)

Source / population	AF	AC	Hom	AN	Coverage
Global population databases 5 sources Large-scale international reference populations
GnomAD3 genomes	AF: 0.246	AC:37439	Hom:4722	AN:152114	Cov:32
GnomAD4 exome	AF: 0.251	AC:333342	Hom:42892	AN:1328962	Cov:
GnomAD4 genome	AF: 0.246	AC:37450	Hom:4724	AN:152232	Cov:32
TOPMed (Bravo)	AF: 0.245	AC:	Hom:	AN:	Cov:
ALFA (dbGaP/dbSNP Allele Frequency Aggregator)	AF: 0.257	AC:33120	Hom:4309	AN:128810	Cov:
Local & regional cohorts 9 sources Population-specific and national genomic databases
ABraOM SABE-WGS-1171	AF: 0.254	AC:594	Hom:84	AN:2342	Cov:
ChinaMAP Phase 1	AF: 0.294	AC:	Hom:	AN:	Cov:
Denmark Genome	AF: 0.253	AC:76	Hom:	AN:300	Cov:
GenomeAsia100K	AF: 0.242	AC:840	Hom:	AN:3478	Cov:
Korea4K (4,157 Koreans)	AF: 0.241	AC:1747	Hom:	AN:7234	Cov:
Qatari Genome	AF: 0.301	AC:53	Hom:	AN:176	Cov:
ToMMo 61KJPN (+60KJPN MNV)	AF: 0.186	AC:22780	Hom:2217	AN:122684	Cov:
UK10K	AF: 0.248	AC:1876	Hom:	AN:7562	Cov:
WBBC (Westlake BioBank for Chinese) pilot	AF: 0.309	AC:2766	Hom:426	AN:8960	Cov:

Showing 14 sources

Case/control cohorts

Cohort	Cases			Controls
	AF	AC	AN	AF	AC	AN
SCHEMA(Schizophrenia)	0.192	12949	67534	0.202	26674	132192

Showing 1 cohortAllele count / allele number. AF is computed from the counts for ASC (not provided by the source).

ClinVar

Not reported in ClinVar

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
AlphaGenome AVI	Benign	4.1
BayesDel_noAF	Benign	-0.85
CADD	Benign	6.3
DANN	Benign	0.72
GPN-Star LLR	N/A	0.085
GPN-Star score	N/A	-0.085
PhyloP100	Benign	1.3

Showing 7 of 7 scores

Splicing Scores

Algorithm	Calibrated pred.	Score	Prediction
Pangolin (max)	Benign	0.0
SpliceAI score (max)	Benign	0.0	Details are displayed if max score is > 0.2

Showing 2 of 2 scores

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

MaveDB functional evidence

MaveDB is a public repository of laboratory assays that test the effect of thousands of variants at once — treat this as supporting research data and interpret it with great caution; it is not a clinical classification.

No MaveDB functional evidence found for this variant.

Other links and lift over

dbSNP: rs3740392;

hg19: chr10-104636855;

COSMIC: COSV54919782;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar