NM_018915.4:c.298G>C

Variant names:

• chr5-141339269-G-C
• rs373238461
• NM_018915.4:c.298G>C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_018915.4(PCDHGA2):​c.298G>C​(p.Ala100Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,824 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: PCDHGA2 NM_018915.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.38

Genes affected

PCDHGA2 (HGNC:8700): (protocadherin gamma subfamily A, 2) This gene is a member of the protocadherin gamma gene cluster, one of three related clusters tandemly linked on chromosome five. These gene clusters have an immunoglobulin-like organization, suggesting that a novel mechanism may be involved in their regulation and expression. The gamma gene cluster includes 22 genes divided into 3 subfamilies. Subfamily A contains 12 genes, subfamily B contains 7 genes and 2 pseudogenes, and the more distantly related subfamily C contains 3 genes. The tandem array of 22 large, variable region exons are followed by a constant region, containing 3 exons shared by all genes in the cluster. Each variable region exon encodes the extracellular region, which includes 6 cadherin ectodomains and a transmembrane region. The constant region exons encode the common cytoplasmic region. These neural cadherin-like cell adhesion proteins most likely play a critical role in the establishment and function of specific cell-cell connections in the brain. Alternative splicing has been described for the gamma cluster genes. [provided by RefSeq, Jul 2008]

PCDHGA1 (HGNC:8696): (protocadherin gamma subfamily A, 1) This gene is a member of the protocadherin gamma gene cluster, one of three related clusters tandemly linked on chromosome five. These gene clusters have an immunoglobulin-like organization, suggesting that a novel mechanism may be involved in their regulation and expression. The gamma gene cluster includes 22 genes divided into 3 subfamilies. Subfamily A contains 12 genes, subfamily B contains 7 genes and 2 pseudogenes, and the more distantly related subfamily C contains 3 genes. The tandem array of 22 large, variable region exons are followed by a constant region, containing 3 exons shared by all genes in the cluster. Each variable region exon encodes the extracellular region, which includes 6 cadherin ectodomains and a transmembrane region. The constant region exons encode the common cytoplasmic region. These neural cadherin-like cell adhesion proteins most likely play a critical role in the establishment and function of specific cell-cell connections in the brain. Alternative splicing has been described for the gamma cluster genes. [provided by RefSeq, Jul 2008]

PCDHG@ (HGNC:8695):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.047675133).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PCDHGA2	NM_018915.4	c.298G>C	p.Ala100Pro	missense_variant	Exon 1 of 4	ENST00000394576.3	NP_061738.1
PCDHGA1	NM_018912.3	c.2421+6164G>C		intron_variant	Intron 1 of 3	ENST00000517417.3	NP_061735.1
PCDHGA2	NM_032009.3	c.298G>C	p.Ala100Pro	missense_variant	Exon 1 of 1		NP_114398.1
PCDHG@		n.141339269G>C		intragenic_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PCDHGA2	ENST00000394576.3	c.298G>C	p.Ala100Pro	missense_variant	Exon 1 of 4	1	NM_018915.4	ENSP00000378077.2
PCDHGA1	ENST00000517417.3	c.2421+6164G>C		intron_variant	Intron 1 of 3	1	NM_018912.3	ENSP00000431083.1
PCDHGA2	ENST00000528330.2	c.298G>C	p.Ala100Pro	missense_variant	Exon 1 of 1	6		ENSP00000483020.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461824 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727218

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.093
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.60
CADD	Benign	7.8
DANN	Benign	0.54
DEOGEN2	Benign	0.0020	.;T
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.4
FATHMM_MKL	Benign	0.17	N
LIST_S2	Benign	0.25	T;T
M_CAP	Benign	0.0070	T
MetaRNN	Benign	0.048	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.58	N;N
PROVEAN	Benign	-0.69	.;N
REVEL	Benign	0.032
Sift	Benign	1.0	.;T
Sift4G	Benign	0.59	T;T
Polyphen		0.0010	B;B
Vest4		0.12
MutPred		0.44		Loss of sheet (P = 0.0357);Loss of sheet (P = 0.0357);
MVP		0.048
MPC		0.43
ClinPred		0.028	T
GERP RS		-1.5
Varity_R		0.073
gMVP		0.29

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: rs373238461; hg19: chr5-140718836;