NM_001940.4:c.1461A>C

Variant names:

• chr12-6936728-A-C
• rs150855426
• NM_001940.4:c.1461A>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001940.4(ATN1):​c.1461A>C​(p.Gln487His) variant causes a missense 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. 16/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. Q487Q) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 21)
• Consequence: ATN1 NM_001940.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.381
• Publications: 4 publications found

Genes affected

ATN1 (HGNC:3033): (atrophin 1) Dentatorubral pallidoluysian atrophy (DRPLA) is a rare neurodegenerative disorder characterized by cerebellar ataxia, myoclonic epilepsy, choreoathetosis, and dementia. The disorder is related to the expansion from 7-35 copies to 49-93 copies of a trinucleotide repeat (CAG/CAA) within this gene. The encoded protein includes a serine repeat and a region of alternating acidic and basic amino acids, as well as the variable glutamine repeat. Alternative splicing results in two transcripts variants that encode the same protein. [provided by RefSeq, Jul 2016]

ATN1 Gene-Disease associations (from GenCC):

• congenital hypotonia, epilepsy, developmental delay, and digital anomalies

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: G2P, Illumina, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• dentatorubral-pallidoluysian atrophy

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.07732731).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001940.4. 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
	ATN1	NM_001940.4	MANE Select	c.1461A>C	p.Gln487His	missense	Exon 5 of 10	NP_001931.2
	ATN1	NM_001007026.2		c.1461A>C	p.Gln487His	missense	Exon 5 of 10	NP_001007027.1
	ATN1	NM_001424176.1		c.1461A>C	p.Gln487His	missense	Exon 5 of 10	NP_001411105.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ATN1	ENST00000396684.3	TSL:1 MANE Select	c.1461A>C	p.Gln487His	missense	Exon 5 of 10	ENSP00000379915.2
	ATN1	ENST00000356654.8	TSL:1	c.1461A>C	p.Gln487His	missense	Exon 5 of 10	ENSP00000349076.3

Frequencies

GnomAD3 genomes Cov.: 21

GnomAD4 exome Cov.: 59

GnomAD4 genome Cov.: 21

Alfa AF: 0.00 Hom.: 83

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.57
CADD	Benign	7.4
DANN	Benign	0.46
DEOGEN2	Benign	0.33	T
Eigen	Benign	-1.7
Eigen_PC	Benign	-1.7
FATHMM_MKL	Benign	0.062	N
LIST_S2	Benign	0.39	T
M_CAP	Benign	0.015	T
MetaRNN	Benign	0.077	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.34	N
PhyloP100		-0.38
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	-0.56	N
REVEL	Benign	0.032
Sift	Benign	0.59	T
Sift4G	Benign	0.14	T
Vest4		0.29
MutPred		0.49		Loss of solvent accessibility (P = 0.1651)
MVP		0.60
MPC		0.069
ClinPred		0.034	T
GERP RS		-3.8
Varity_R		0.032
gMVP		0.11
Mutation Taster		=96/4	polymorphism

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

Other links and lift over

dbSNP: rs150855426; hg19: chr12-7045891; COSMIC: COSV63111594; COSMIC: COSV63111594;