X-100296647-G-T

Variant names:

• chrX-100296647-G-T
• rs762888017
• NM_001184880.2:c.3077C>A
• PCDH19 p.Pro1026Gln

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_001184880.2(PCDH19):​c.3077C>A​(p.Pro1026Gln) 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. 13/21 in silico tools predict 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. P1026L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 22)
• Consequence: PCDH19 NM_001184880.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.255
• Publications: 1 publications found

Genes affected

PCDH19 (HGNC:14270): (protocadherin 19) The protein encoded by this gene is a member of the delta-2 protocadherin subclass of the cadherin superfamily. The encoded protein is thought to be a calcium-dependent cell-adhesion protein that is primarily expressed in the brain. Mutations in this gene on human chromosome X are associated with sporadic infantile epileptic encephalopathy and to a female-restricted form of epilepsy (EFMR; also known as PCDH19RE). Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2017]

PCDH19 Gene-Disease associations (from GenCC):

• developmental and epileptic encephalopathy, 9

  Inheritance: XL, Unknown Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae), Orphanet
• X-linked complex neurodevelopmental disorder

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• Dravet syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 107 curated pathogenic missense variants (we use a threshold of 10). The gene has 20 curated benign missense variants. Gene score misZ: 2.5929 (below the threshold of 3.09). Trascript score misZ: NaN (below the threshold of 3.09). GenCC associations: The gene is linked to developmental and epileptic encephalopathy, 9, X-linked complex neurodevelopmental disorder, Dravet syndrome.
• BP4: Computational evidence support a benign effect (MetaRNN=0.08633384).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001184880.2. 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
	PCDH19	NM_001184880.2	MANE Select	c.3077C>A	p.Pro1026Gln	missense	Exon 6 of 6	NP_001171809.1	Q8TAB3-1
	PCDH19	NM_001105243.2		c.2936C>A	p.Pro979Gln	missense	Exon 5 of 5	NP_001098713.1	Q8TAB3-2
	PCDH19	NM_020766.3		c.2933C>A	p.Pro978Gln	missense	Exon 5 of 5	NP_065817.2	Q8TAB3-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PCDH19	ENST00000373034.8	TSL:1 MANE Select	c.3077C>A	p.Pro1026Gln	missense	Exon 6 of 6	ENSP00000362125.4	Q8TAB3-1
	PCDH19	ENST00000255531.8	TSL:1	c.2936C>A	p.Pro979Gln	missense	Exon 5 of 5	ENSP00000255531.7	Q8TAB3-2
	PCDH19	ENST00000420881.6	TSL:1	c.2933C>A	p.Pro978Gln	missense	Exon 5 of 5	ENSP00000400327.2	Q8TAB3-3

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 22

Alfa AF: 0.00 Hom.: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.069
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	12
DANN	Uncertain	0.98
DEOGEN2	Benign	0.024	T
FATHMM_MKL	Benign	0.36	N
LIST_S2	Benign	0.64	T
M_CAP	Pathogenic	0.45	D
MetaRNN	Benign	0.086	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.90	L
PhyloP100		0.26
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-0.41	N
REVEL	Benign	0.098
Sift	Benign	0.11	T
Sift4G	Benign	0.31	T
Varity_R		0.049
gMVP		0.20
Mutation Taster		=93/7	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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs762888017;

hg19: chrX-99551645;