9-95478125-G-C

Variant names:

• chr9-95478125-G-C
• rs755787454
• NM_000264.5:c.1277C>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_000264.5(PTCH1):​c.1277C>G​(p.Thr426Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T426A) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PTCH1 NM_000264.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.60
• Publications: 0 publications found

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]

PTCH1 Gene-Disease associations (from GenCC):

• basal cell nevus syndrome 1

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• holoprosencephaly 7

  Inheritance: AD Classification: DEFINITIVE, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• nevoid basal cell carcinoma syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), ClinGen
• holoprosencephaly

  Inheritance: AD Classification: LIMITED Submitted by: Illumina

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000264.5. 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
	PTCH1	NM_000264.5	MANE Select	c.1277C>G	p.Thr426Ser	missense	Exon 9 of 24	NP_000255.2	Q13635-1
	PTCH1	NM_001083603.3	MANE Plus Clinical	c.1274C>G	p.Thr425Ser	missense	Exon 9 of 24	NP_001077072.1	Q13635-2
	PTCH1	NM_001354918.2		c.1277C>G	p.Thr426Ser	missense	Exon 9 of 23	NP_001341847.1	A0A1W5YLI7

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PTCH1	ENST00000331920.11	TSL:5 MANE Select	c.1277C>G	p.Thr426Ser	missense	Exon 9 of 24	ENSP00000332353.6	Q13635-1
	PTCH1	ENST00000437951.6	TSL:5 MANE Plus Clinical	c.1274C>G	p.Thr425Ser	missense	Exon 9 of 24	ENSP00000389744.2	Q13635-2
	PTCH1	ENST00000429896.6	TSL:1	c.824C>G	p.Thr275Ser	missense	Exon 9 of 24	ENSP00000414823.2	Q13635-4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.22
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.050
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.52	D
Eigen	Benign	0.16
Eigen_PC	Uncertain	0.35
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.80	T
M_CAP	Uncertain	0.20	D
MetaRNN	Uncertain	0.68	D
MetaSVM	Uncertain	0.34	D
MutationAssessor	Benign	1.6	L
PhyloP100		9.6
PrimateAI	Pathogenic	0.81	D
PROVEAN	Benign	-1.5	N
REVEL	Uncertain	0.55
Sift	Benign	0.17	T
Sift4G	Benign	0.30	T
Polyphen		0.38	B
Vest4		0.88
MutPred		0.61		Loss of helix (P = 0.0558)
MVP		0.45
MPC		0.67
ClinPred		0.91	D
GERP RS		5.6
Varity_R		0.64
gMVP		0.45
Mutation Taster		=42/58	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs755787454; hg19: chr9-98240407;