19-1032448-A-T

Variant names:

• chr19-1032448-A-T
• rs776457860
• NM_004368.4:c.242A>T

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP2 PP3

The NM_004368.4(CNN2):​c.242A>T​(p.Asn81Ile) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N81S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: CNN2 NM_004368.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.80
• Publications: 0 publications found

Genes affected

CNN2 (HGNC:2156): (calponin 2) The protein encoded by this gene, which can bind actin, calmodulin, troponin C, and tropomyosin, may function in the structural organization of actin filaments. The encoded protein could play a role in smooth muscle contraction and cell adhesion. Several pseudogenes of this gene have been identified, and are present on chromosomes 1, 2, 3, 6, 9, 11, 13, 15, 16, 21 and 22. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jan 2015]

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 2 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: -0.15171 (below the threshold of 3.09). Trascript score misZ: 0.22112 (below the threshold of 3.09).
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.755

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004368.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CNN2	NM_004368.4	MANE Select	c.242A>T	p.Asn81Ile	missense	Exon 3 of 7	NP_004359.1	Q99439-1
	CNN2	NM_001303501.2		c.242A>T	p.Asn81Ile	missense	Exon 3 of 7	NP_001290430.1	B4DUT8
	CNN2	NM_001303499.2		c.242A>T	p.Asn81Ile	missense	Exon 3 of 7	NP_001290428.1	B4DDF4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CNN2	ENST00000263097.9	TSL:1 MANE Select	c.242A>T	p.Asn81Ile	missense	Exon 3 of 7	ENSP00000263097.2	Q99439-1
	CNN2	ENST00000607102.1	TSL:1	c.34-3968A>T		intron	N/A	ENSP00000475175.1	U3KPS3
	CNN2	ENST00000562958.6	TSL:2	c.242A>T	p.Asn81Ile	missense	Exon 3 of 7	ENSP00000456436.1	B4DUT8

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 44

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.79
BayesDel_addAF	Uncertain	0.098	D
BayesDel_noAF	Benign	-0.10
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.87	D
Eigen	Uncertain	0.56
Eigen_PC	Uncertain	0.48
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.92	D
M_CAP	Uncertain	0.23	D
MetaRNN	Pathogenic	0.75	D
MetaSVM	Uncertain	-0.24	T
MutationAssessor	Uncertain	2.6	M
PhyloP100		5.8
PrimateAI	Uncertain	0.56	T
PROVEAN	Pathogenic	-5.9	D
REVEL	Uncertain	0.34
Sift	Uncertain	0.015	D
Sift4G	Uncertain	0.053	T
Polyphen		0.98	D
Vest4		0.91
MutPred		0.57		Gain of catalytic residue at N81 (P = 0.015)
MVP		0.75
MPC		0.53
ClinPred		0.99	D
GERP RS		4.0
Varity_R		0.63
gMVP		0.79
Mutation Taster		=66/34	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: rs776457860; hg19: chr19-1032447;