NM_016169.4:c.91C>G

Variant names:

• chr10-102504243-C-G
• rs1554840836
• NM_016169.4:c.91C>G

Variant summary

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

The NM_016169.4(SUFU):​c.91C>G​(p.Pro31Ala) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P31L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SUFU NM_016169.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.03
• Publications: 0 publications found

Genes affected

SUFU (HGNC:16466): (SUFU negative regulator of hedgehog signaling) The Hedgehog signaling pathway plays an important role in early human development. The pathway is a signaling cascade that plays a role in pattern formation and cellular proliferation during development. This gene encodes a negative regulator of the hedgehog signaling pathway. Defects in this gene are a cause of medulloblastoma. Alternative splicing results in multiple transcript variants.[provided by RefSeq, May 2010]

SUFU Gene-Disease associations (from GenCC):

• medulloblastoma

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

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Illumina, Genomics England PanelApp
• basal cell nevus syndrome 2

  Inheritance: AD Classification: STRONG Submitted by: G2P
• ocular motor apraxia, Cogan type

  Inheritance: AD Classification: STRONG Submitted by: Franklin by Genoox
• Joubert syndrome 32

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• Joubert syndrome

  Inheritance: AR, AD Classification: MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics
• apraxia

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• ciliopathy

  Inheritance: AR Classification: LIMITED Submitted by: ClinGen

ACMG classification

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

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SUFU	NM_016169.4	c.91C>G	p.Pro31Ala	missense_variant	Exon 1 of 12	ENST00000369902.8	NP_057253.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SUFU	ENST00000369902.8	c.91C>G	p.Pro31Ala	missense_variant	Exon 1 of 12	1	NM_016169.4	ENSP00000358918.4
SUFU	ENST00000423559.2	c.91C>G	p.Pro31Ala	missense_variant	Exon 1 of 10	1		ENSP00000411597.2
SUFU	ENST00000369899.6	c.91C>G	p.Pro31Ala	missense_variant	Exon 1 of 11	1		ENSP00000358915.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 53

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Gorlin syndrome;C0025149:Medulloblastoma Uncertain:1

Jul 19, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with SUFU-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces proline with alanine at codon 31 of the SUFU protein (p.Pro31Ala). The proline residue is highly conserved and there is a small physicochemical difference between proline and alanine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.73
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.010
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Benign	0.22	T;.;.
Eigen	Uncertain	0.22
Eigen_PC	Uncertain	0.25
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.93	D;D;D
M_CAP	Pathogenic	0.61	D
MetaRNN	Uncertain	0.64	D;D;D
MetaSVM	Benign	-0.36	T
MutationAssessor	Benign	1.1	L;L;L
PhyloP100		7.0
PrimateAI	Pathogenic	0.91	D
PROVEAN	Benign	-1.6	N;N;N
REVEL	Uncertain	0.51
Sift	Benign	0.071	T;T;T
Sift4G	Benign	0.21	T;T;T
Polyphen		0.98	D;P;D
Vest4		0.52
MutPred		0.68		Gain of helix (P = 0.0425);Gain of helix (P = 0.0425);Gain of helix (P = 0.0425);
MVP		0.59
MPC		1.6
ClinPred		0.96	D
GERP RS		4.0
PromoterAI		0.015	Neutral
Varity_R		0.51
gMVP		0.73
Mutation Taster		=33/67	disease causing

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

Other links and lift over

dbSNP: rs1554840836; hg19: chr10-104264000;