NM_004304.5:c.505A>G

Variant names:

• chr2-29920155-T-C
• rs932619554
• NM_004304.5:c.505A>G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_004304.5(ALK):​c.505A>G​(p.Asn169Asp) 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. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: ALK NM_004304.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.67

Genes affected

ALK (HGNC:427): (ALK receptor tyrosine kinase) This gene encodes a receptor tyrosine kinase, which belongs to the insulin receptor superfamily. This protein comprises an extracellular domain, an hydrophobic stretch corresponding to a single pass transmembrane region, and an intracellular kinase domain. It plays an important role in the development of the brain and exerts its effects on specific neurons in the nervous system. This gene has been found to be rearranged, mutated, or amplified in a series of tumours including anaplastic large cell lymphomas, neuroblastoma, and non-small cell lung cancer. The chromosomal rearrangements are the most common genetic alterations in this gene, which result in creation of multiple fusion genes in tumourigenesis, including ALK (chromosome 2)/EML4 (chromosome 2), ALK/RANBP2 (chromosome 2), ALK/ATIC (chromosome 2), ALK/TFG (chromosome 3), ALK/NPM1 (chromosome 5), ALK/SQSTM1 (chromosome 5), ALK/KIF5B (chromosome 10), ALK/CLTC (chromosome 17), ALK/TPM4 (chromosome 19), and ALK/MSN (chromosome X).[provided by RefSeq, Jan 2011]

ENSG00000288553 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a glycosylation_site N-linked (GlcNAc...) asparagine (size 0) in uniprot entity ALK_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.1524755).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALK	NM_004304.5	c.505A>G	p.Asn169Asp	missense_variant	Exon 1 of 29	ENST00000389048.8	NP_004295.2
ALK	XR_001738688.3	n.1432A>G		non_coding_transcript_exon_variant	Exon 1 of 18

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALK	ENST00000389048.8	c.505A>G	p.Asn169Asp	missense_variant	Exon 1 of 29	1	NM_004304.5	ENSP00000373700.3
ENSG00000288553	ENST00000669284.1	n.157+35094A>G		intron_variant	Intron 1 of 1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neuroblastoma, susceptibility to, 3 Uncertain:1

May 16, 2018

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with ALK-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces asparagine with aspartic acid at codon 169 of the ALK protein (p.Asn169Asp). The asparagine residue is moderately conserved and there is a small physicochemical difference between asparagine and aspartic acid. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.083	T
Eigen	Benign	-0.54
Eigen_PC	Benign	-0.34
FATHMM_MKL	Benign	0.18	N
LIST_S2	Benign	0.59	T
M_CAP	Benign	0.037	D
MetaRNN	Benign	0.15	T
MetaSVM	Benign	-0.90	T
MutationAssessor	Benign	0.69	N
PrimateAI	Uncertain	0.65	T
PROVEAN	Benign	-0.32	N
REVEL	Benign	0.039
Sift	Benign	0.17	T
Sift4G	Benign	0.32	T
Polyphen		0.0010	B
Vest4		0.13
MutPred		0.40		Gain of helix (P = 0.0034);
MVP		0.52
MPC		0.20
ClinPred		0.22	T
GERP RS		3.0
Varity_R		0.060
gMVP		0.069

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: rs932619554; hg19: chr2-30143021;