chr9-95485821-C-T

Position:

• chr9-95485821-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP2 PP3

The NM_000264.5(PTCH1):​c.448G>A​(p.Glu150Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic 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. E150D) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: PTCH1 NM_000264.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.57

Genes affected

PTCH1 (HGNC:9585): (patched 1) This gene encodes a member of the patched family of proteins and a component of the hedgehog signaling pathway. Hedgehog signaling is important in embryonic development and tumorigenesis. The encoded protein is the receptor for the secreted hedgehog ligands, which include sonic hedgehog, indian hedgehog and desert hedgehog. Following binding by one of the hedgehog ligands, the encoded protein is trafficked away from the primary cilium, relieving inhibition of the G-protein-coupled receptor smoothened, which results in activation of downstream signaling. Mutations of this gene have been associated with basal cell nevus syndrome and holoprosencephaly. [provided by RefSeq, Aug 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), PTCH1. . Gene score misZ 1.6774 (greater than the threshold 3.09). Trascript score misZ 3.1343 (greater than threshold 3.09). GenCC has associacion of gene with holoprosencephaly 7, nevoid basal cell carcinoma syndrome, holoprosencephaly.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.787

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PTCH1	NM_000264.5	c.448G>A	p.Glu150Lys	missense_variant	3/24	ENST00000331920.11
PTCH1	NM_001083603.3	c.445G>A	p.Glu149Lys	missense_variant	3/24	ENST00000437951.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PTCH1	ENST00000331920.11	c.448G>A	p.Glu150Lys	missense_variant	3/24	5	NM_000264.5	A2
PTCH1	ENST00000437951.6	c.445G>A	p.Glu149Lys	missense_variant	3/24	5	NM_001083603.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000658 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.71
BayesDel_addAF	Pathogenic	0.41	D
BayesDel_noAF	Pathogenic	0.35
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.38	T;.;.;.;.
Eigen	Uncertain	0.44
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D;.;D;D
M_CAP	Uncertain	0.11	D
MetaRNN	Pathogenic	0.79	D;D;D;D;D
MetaSVM	Uncertain	0.35	D
MutationAssessor	Uncertain	2.1	M;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.75	T
PROVEAN	Benign	-1.8	N;N;N;N;N
REVEL	Pathogenic	0.65
Sift	Benign	0.19	T;T;T;T;T
Sift4G	Benign	0.20	T;T;T;T;D
Polyphen		0.58	P;P;P;D;.
Vest4		0.79
MutPred		0.50		Gain of MoRF binding (P = 0.0054);.;.;.;.;
MVP		0.88
MPC		0.77
ClinPred		0.75	D
GERP RS		5.7
Varity_R		0.67
gMVP		0.68

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.11		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: rs1344258746; hg19: chr9-98248103;