chr21-28878060-C-T

Position:

• chr21-28878060-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_013240.6(N6AMT1):​c.538+132G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 33)
• Consequence: N6AMT1 NM_013240.6 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.377

Genes affected

N6AMT1 (HGNC:16021): (N-6 adenine-specific DNA methyltransferase 1) This gene encodes an N(6)-adenine-specific DNA methyltransferase. The encoded enzyme may be involved in the methylation of release factor I during translation termination. This enzyme is also involved in converting the arsenic metabolite monomethylarsonous acid to the less toxic dimethylarsonic acid. Alternative splicing of this gene results in multiple transcript variants. A related pseudogene has been identified on chromosome 11. [provided by RefSeq, Mar 2023]

N6AMT1 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.81).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
N6AMT1	NM_013240.6	c.538+132G>A		intron_variant		ENST00000303775.10	NP_037372.4
N6AMT1	NM_182749.5	c.454+132G>A		intron_variant			NP_877426.4
N6AMT1	NR_047510.3	n.560+132G>A		intron_variant
N6AMT1	XR_007067787.1	n.560+132G>A		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
N6AMT1	ENST00000303775.10	c.538+132G>A		intron_variant		1	NM_013240.6	ENSP00000303584.5
N6AMT1	ENST00000351429.7	c.454+132G>A		intron_variant		1		ENSP00000286764.4
N6AMT1	ENST00000460212.1	n.538+132G>A		intron_variant		1		ENSP00000436490.1

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.81
CADD	Benign	5.1

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs2738960; hg19: chr21-30250382;