6-158977717-A-G

Variant names:

• chr6-158977717-A-G
• rs2128605197
• NM_031924.8:c.1078T>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_031924.8(RSPH3):​c.1078T>C​(p.Phe360Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: RSPH3 NM_031924.8 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.432
• Publications: 0 publications found

Genes affected

RSPH3 (HGNC:21054): (radial spoke head 3) The protein encoded by this gene acts as a protein kinase A anchoring protein. Mutations in this gene cause primary ciliary dyskinesia; a disorder characterized by defects of the axoneme in motile cilia and sperm flagella. The homolog of this gene was first identified in the blue-green algae Chlamydomonas as encoding a radial spoke protein that formed a structural component of motile cilia and flagella. Alternate splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Dec 2016]

RSPH3 Gene-Disease associations (from GenCC):

• primary ciliary dyskinesia 32

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, PanelApp Australia, Ambry Genetics
• primary ciliary dyskinesia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.04740143).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RSPH3	NM_031924.8	c.1078T>C	p.Phe360Leu	missense_variant	Exon 8 of 8	ENST00000367069.7	NP_114130.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RSPH3	ENST00000367069.7	c.1078T>C	p.Phe360Leu	missense_variant	Exon 8 of 8	1	NM_031924.8	ENSP00000356036.1
RSPH3	ENST00000449822.6	c.790T>C	p.Phe264Leu	missense_variant	Exon 6 of 6	2		ENSP00000393195.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia 32 Uncertain:1

Oct 22, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces phenylalanine with leucine at codon 502 of the RSPH3 protein (p.Phe502Leu). The phenylalanine residue is moderately conserved and there is a small physicochemical difference between phenylalanine and leucine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with RSPH3-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The leucine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.47
BayesDel_addAF	Benign	-0.39	T
BayesDel_noAF	Benign	-0.80
CADD	Benign	0.11
DANN	Benign	0.62
DEOGEN2	Benign	0.0091	T;.;T
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.4
FATHMM_MKL	Benign	0.0090	N
LIST_S2	Benign	0.40	T;T;T
M_CAP	Benign	0.0020	T
MetaRNN	Benign	0.047	T;T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	0.81	.;.;L
PhyloP100		-0.43
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-0.27	N;N;N
REVEL	Benign	0.014
Sift	Benign	0.89	T;T;T
Sift4G	Benign	0.36	T;T;T
Polyphen		0.0	.;.;B
Vest4		0.020
MutPred		0.084		.;.;Gain of helix (P = 0.132);
MVP		0.081
MPC		0.34
ClinPred		0.048	T
GERP RS		-5.2
Varity_R		0.086
gMVP		0.032
Mutation Taster		=93/7	polymorphism

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: rs2128605197; hg19: chr6-159398749;