chr15-43522486-A-G

Position:

• chr15-43522486-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_002373.6(MAP1A):​c.1013A>G​(p.Glu338Gly) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MAP1A NM_002373.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.65

Genes affected

MAP1A (HGNC:6835): (microtubule associated protein 1A) This gene encodes a protein that belongs to the microtubule-associated protein family. The proteins of this family are thought to be involved in microtubule assembly, which is an essential step in neurogenesis. The product of this gene is a precursor polypeptide that presumably undergoes proteolytic processing to generate the final MAP1A heavy chain and LC2 light chain. Expression of this gene is almost exclusively in the brain. Studies of the rat microtubule-associated protein 1A gene suggested a role in early events of spinal cord development. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.3058504).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MAP1A	NM_002373.6	c.1013A>G	p.Glu338Gly	missense_variant	4/6	ENST00000300231.6	NP_002364.5
MAP1A	NM_001411089.1	c.1727A>G	p.Glu576Gly	missense_variant	5/7		NP_001398018.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MAP1A	ENST00000300231.6	c.1013A>G	p.Glu338Gly	missense_variant	4/6	5	NM_002373.6	ENSP00000300231	P2
MAP1A	ENST00000382031.5	c.1727A>G	p.Glu576Gly	missense_variant	5/7	5		ENSP00000371462	A2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 20, 2023

The c.1013A>G (p.E338G) alteration is located in exon 4 (coding exon 1) of the MAP1A gene. This alteration results from a A to G substitution at nucleotide position 1013, causing the glutamic acid (E) at amino acid position 338 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.46
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.26	.;T
Eigen	Uncertain	0.67
Eigen_PC	Uncertain	0.66
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.83	T;T
M_CAP	Benign	0.0059	T
MetaRNN	Benign	0.31	T;T
MetaSVM	Benign	-1.2	T
MutationAssessor	Benign	1.9	.;L
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.48	T
PROVEAN	Uncertain	-3.3	D;D
REVEL	Benign	0.21
Sift	Uncertain	0.016	D;D
Sift4G	Uncertain	0.0060	D;D
Polyphen		1.0	.;D
Vest4		0.34
MutPred		0.43		.;Gain of MoRF binding (P = 0.0148);
MVP		0.17
MPC		0.50
ClinPred		0.97	D
GERP RS		5.1
Varity_R		0.26
gMVP		0.35

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: rs2079323319; hg19: chr15-43814684;