5-150056331-C-T

Position:

• chr5-150056331-C-T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_001288705.3(CSF1R):​c.2330G>A​(p.Arg777Gln) 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. Variant has been reported in ClinVar as Pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R777W) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CSF1R NM_001288705.3 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2 O:1
• Conservation: PhyloP100: 7.91

Genes affected

CSF1R (HGNC:2433): (colony stimulating factor 1 receptor) The protein encoded by this gene is the receptor for colony stimulating factor 1, a cytokine which controls the production, differentiation, and function of macrophages. This receptor mediates most if not all of the biological effects of this cytokine. Ligand binding activates the receptor kinase through a process of oligomerization and transphosphorylation. The encoded protein is a tyrosine kinase transmembrane receptor and member of the CSF1/PDGF receptor family of tyrosine-protein kinases. Mutations in this gene have been associated with a predisposition to myeloid malignancy. The first intron of this gene contains a transcriptionally inactive ribosomal protein L7 processed pseudogene oriented in the opposite direction. Alternative splicing results in multiple transcript variants. Expression of a splice variant from an LTR promoter has been found in Hodgkin lymphoma (HL), HL cell lines and anaplastic large cell lymphoma. [provided by RefSeq, Mar 2017]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_001288705.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr5-150056332-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 65685.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.994
• PP5: Variant 5-150056331-C-T is Pathogenic according to our data. Variant chr5-150056331-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 162111.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr5-150056331-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CSF1R	NM_001288705.3	c.2330G>A	p.Arg777Gln	missense_variant	17/21	ENST00000675795.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CSF1R	ENST00000675795.1	c.2330G>A	p.Arg777Gln	missense_variant	17/21		NM_001288705.3	P1
CSF1R	ENST00000286301.7	c.2330G>A	p.Arg777Gln	missense_variant	18/22	1		P1
CSF1R	ENST00000504875.5	c.*151G>A		3_prime_UTR_variant, NMD_transcript_variant	16/20	1
CSF1R	ENST00000515068.1	c.*304G>A		3_prime_UTR_variant, NMD_transcript_variant	6/7	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

CSF1R-related disorder Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Dec 28, 2022

The CSF1R c.2330G>A variant is predicted to result in the amino acid substitution p.Arg777Gln. This variant has been reported to be causative for autosomal dominant diffuse hereditary leukoencephalopathy with spheroids (Guerreiro et al. 2013. PubMed ID: 23649896; Karle et al. 2013. PubMed ID: 24198292; Codjia et al. 2018. PubMed ID: 30115677; Makary et al. 2019. PubMed ID: 30614382; Kempthorne et al. 2020. PubMed ID: 32430064). Of note, a different missense variant affecting the same residue (p.Arg777Trp) has also been reported to be pathogenic for diffuse hereditary leukoencephalopathy with spheroids (Guerreiro et al. 2013. PubMed ID: 23649896). This variant has not been reported in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. This variant is interpreted as pathogenic. -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Jul 26, 2023

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 777 of the CSF1R protein (p.Arg777Gln). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of autosomal dominant hereditary diffuse leukoencephalopathy with spheroids (PMID: 23649896, 24198292). In at least one individual the variant was observed to be de novo. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 162111). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on CSF1R protein function. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. This variant disrupts the p.Arg777 amino acid residue in CSF1R. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 23038421, 23649896, 30268725). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Hereditary diffuse leukoencephalopathy with spheroids Other:1

not provided, no classification provided

literature only

GeneReviews

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.47	D
BayesDel_noAF	Pathogenic	0.44
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.90	D
Eigen	Pathogenic	0.82
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.72	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	0.91	D
MutationAssessor	Pathogenic	3.1	M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.74	T
PROVEAN	Uncertain	-3.3	D
REVEL	Pathogenic	0.88
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.99
MutPred		0.99		Gain of ubiquitination at K772 (P = 0.0452);
MVP		0.99
MPC		3.2
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.96
gMVP		0.96

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.23		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.23		Position offset: -2

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

Publications

LitVar

Other links and lift over

dbSNP: rs690016548; hg19: chr5-149435894;