1-6825205-A-G

Position:

• chr1-6825205-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP2

The NM_015215.4(CAMTA1):​c.229A>G​(p.Asn77Asp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. N77K) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CAMTA1 NM_015215.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.16

Genes affected

CAMTA1 (HGNC:18806): (calmodulin binding transcription activator 1) The protein encoded by this gene contains a CG1 DNA-binding domain, a transcription factor immunoglobulin domain, ankyrin repeats, and calmodulin-binding IQ motifs. The encoded protein is thought to be a transcription factor and may be a tumor suppressor. However, a translocation event is sometimes observed between this gene and the WWTR1 gene, with the resulting WWTR1-CAMTA1 oncoprotein leading to epithelioid hemangioendothelioma, a malignant vascular cancer. [provided by RefSeq, Mar 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a DNA_binding_region CG-1 (size 125) in uniprot entity CMTA1_HUMAN there are 8 pathogenic changes around while only 1 benign (89%) in NM_015215.4
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), CAMTA1. . Gene score misZ 3.2619 (greater than the threshold 3.09). Trascript score misZ 4.755 (greater than threshold 3.09). GenCC has associacion of gene with cerebellar dysfunction with variable cognitive and behavioral abnormalities.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CAMTA1	NM_015215.4	c.229A>G	p.Asn77Asp	missense_variant	3/23	ENST00000303635.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CAMTA1	ENST00000303635.12	c.229A>G	p.Asn77Asp	missense_variant	3/23	1	NM_015215.4	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1411308 Hom.: 0 Cov.: 24 AF XY: 0.00 AC XY: 0 AN XY: 703832

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cerebellar dysfunction with variable cognitive and behavioral abnormalities Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing;provider interpretation

Geisinger Autism and Developmental Medicine Institute, Geisinger Health System

May 25, 2017

This is a 26 year old female with generalized anxiety disorder, depression, obsessive compulsive disorder, learning disability, speech delay hypernasal speech, hypersomnia, spastic diplegia, and scoliosis. There is no history of ataxia. There is a maternal history of depression and anxiety and paternal history of dyslexia. This p.N77D variant is absent from the gnomAD database. Computational prediction models are inconsistent. Whole exome sequencing identified 2 additional variants of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Benign	-0.0042	T
BayesDel_noAF	Benign	-0.24
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Benign	0.18	T;.;.;.
Eigen	Pathogenic	0.78
Eigen_PC	Pathogenic	0.79
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.95	D;D;D;D
M_CAP	Benign	0.0075	T
MetaRNN	Uncertain	0.71	D;D;D;D
MetaSVM	Benign	-0.95	T
MutationAssessor	Uncertain	2.1	M;M;M;.
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Pathogenic	0.86	D
PROVEAN	Uncertain	-3.0	D;D;D;D
REVEL	Uncertain	0.33
Sift	Uncertain	0.021	D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	D;.;.;.
Vest4		0.86
MutPred		0.50		Gain of phosphorylation at T76 (P = 0.0877);Gain of phosphorylation at T76 (P = 0.0877);Gain of phosphorylation at T76 (P = 0.0877);.;
MVP		0.73
MPC		0.76
ClinPred		0.95	D
GERP RS		6.0
Varity_R		0.29
gMVP		0.57

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

Publications

LitVar

Other links and lift over

dbSNP: rs1557636777; hg19: chr1-6885265;