19-1453314-C-G

Variant names:

• chr19-1453314-C-G
• rs144391493
• NM_005883.3:c.209C>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_005883.3(APC2):​c.209C>G​(p.Thr70Arg) 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. 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. T70M) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: APC2 NM_005883.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.53
• Publications: 0 publications found

Genes affected

APC2 (HGNC:24036): (APC regulator of WNT signaling pathway 2) This gene encodes a strongly conserved protein that has an N-terminal coiled-coil domain followed by an armadillo domain, five 20-amino acid repeats, and two SAMP domains. This protein promotes the assembly of a multiprotein complex that recruits and phosphorylates the Wnt effector beta-catenin and targets beta-catenin for ubiquitylation and proteasomal degradation. This protein therefore plays a role in the reduction of cytoplasmic levels of beta-catenin which in turn reduces activation of Wnt target genes that play a pivotal role in the pathogenesis of various human cancers. The protein encoded by this gene is closely related to the adenomatous polyposis coli (APC) tumor-suppressor protein and has similar tumor-suppressor effects. This gene also plays a role in actin assembly, cell-cell adhesion, and microtubule network formation through its interaction with cytoskeletal proteins. This gene has its highest expression in the central nervous system and is involved in brain development through cytoskeletal regulation in neurons. Alternative splicing produces multiple transcript variants encoding distinct isoforms. [provided by RefSeq, May 2017]

APC2 Gene-Disease associations (from GenCC):

• cortical dysplasia, complex, with other brain malformations 10

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
• lissencephaly spectrum disorders

  Inheritance: AR Classification: STRONG Submitted by: ClinGen
• Sotos syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• intellectual developmental disorder, autosomal recessive 74

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2730692).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005883.3. 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
	APC2	NM_005883.3	MANE Select	c.209C>G	p.Thr70Arg	missense	Exon 3 of 15	NP_005874.1	O95996-1
	APC2	NM_001351273.1		c.209C>G	p.Thr70Arg	missense	Exon 2 of 14	NP_001338202.1	O95996-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	APC2	ENST00000590469.6	TSL:1 MANE Select	c.209C>G	p.Thr70Arg	missense	Exon 3 of 15	ENSP00000467073.2	O95996-1
	APC2	ENST00000233607.6	TSL:1	c.209C>G	p.Thr70Arg	missense	Exon 3 of 15	ENSP00000233607.2	O95996-1
	APC2	ENST00000535453.5	TSL:1	c.209C>G	p.Thr70Arg	missense	Exon 2 of 14	ENSP00000442954.1	O95996-1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00 AC: 0 AN: 218894 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Benign	-0.087	T
BayesDel_noAF	Benign	-0.36
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Benign	0.36	T
Eigen	Uncertain	0.48
Eigen_PC	Uncertain	0.47
FATHMM_MKL	Uncertain	0.76	D
LIST_S2	Uncertain	0.94	D
M_CAP	Benign	0.080	D
MetaRNN	Benign	0.27	T
MetaSVM	Benign	-1.1	T
PhyloP100		3.5
PrimateAI	Uncertain	0.49	T
PROVEAN	Uncertain	-3.2	D
REVEL	Benign	0.15
Sift	Uncertain	0.019	D
Sift4G	Uncertain	0.019	D
Polyphen		0.99	D
Vest4		0.58
MutPred		0.19		Gain of MoRF binding (P = 0.0334)
MVP		0.48
MPC		1.5
ClinPred		0.99	D
GERP RS		3.8
Varity_R		0.49
gMVP		0.45
Mutation Taster		=90/10	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: rs144391493; hg19: chr19-1453313;