rs1554702009

Positions:

• chr9-95485685-C-A
• chr9-95485685-C-G
• chr9-95485685-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PM5 PP2 PP3_Moderate

The NM_000264.5(PTCH1):​c.584G>T​(p.Arg195Met) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 3/3 splice prediction tools predicting alterations to normal splicing. 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. R195K) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PTCH1 NM_000264.5 missense, splice_region
• Scores: Splicing: ADA: 0.9998
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.15

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 Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-95485685-C-T is described in Lovd as [Pathogenic].
• 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: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PTCH1	NM_000264.5	c.584G>T	p.Arg195Met	missense_variant, splice_region_variant	3/24	ENST00000331920.11	NP_000255.2
PTCH1	NM_001083603.3	c.581G>T	p.Arg194Met	missense_variant, splice_region_variant	3/24	ENST00000437951.6	NP_001077072.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PTCH1	ENST00000331920.11	c.584G>T	p.Arg195Met	missense_variant, splice_region_variant	3/24	5	NM_000264.5	ENSP00000332353	A2
PTCH1	ENST00000437951.6	c.581G>T	p.Arg194Met	missense_variant, splice_region_variant	3/24	5	NM_001083603.3	ENSP00000389744

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.52
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.11
CADD	Pathogenic	36
DANN	Benign	0.96
DEOGEN2	Benign	0.36	T;.;.;.;.;.;.;.;.;.;.;.;.
Eigen	Uncertain	0.48
Eigen_PC	Uncertain	0.55
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.94	D;.;D;D;.;.;D;.;.;.;D;D;D
M_CAP	Uncertain	0.14	D
MetaRNN	Uncertain	0.48	T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.34	D
MutationAssessor	Benign	1.8	L;.;.;.;.;.;.;.;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.82	D
PROVEAN	Benign	-0.72	N;N;N;N;N;N;N;N;N;N;N;N;N
REVEL	Uncertain	0.60
Sift	Benign	0.060	T;D;D;D;D;D;T;D;D;D;D;T;T
Sift4G	Benign	0.075	T;T;T;T;T;T;T;D;D;D;D;D;D
Polyphen		0.94	P;.;.;P;P;.;D;.;.;.;.;.;.
Vest4		0.68
MutPred		0.43		Loss of MoRF binding (P = 0.0494);.;.;.;.;.;.;.;.;.;.;.;.;
MVP		0.72
MPC		0.96
ClinPred		0.78	D
GERP RS		5.9
Varity_R		0.38
gMVP		0.72

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.96
SpliceAI score (max)		0.94		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.94		Position offset: -37
DS_DL_spliceai		0.92		Position offset: 0

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr9-98247967; COSMIC: COSV59501861; COSMIC: COSV59501861;