10-73192686-T-G

Variant names:

• chr10-73192686-T-G
• rs1239830024
• NM_173348.2:c.413T>G

Variant summary

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

The NM_173348.2(FAM149B1):​c.413T>G​(p.Phe138Cys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: FAM149B1 NM_173348.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.50
• Publications: 0 publications found

Genes affected

FAM149B1 (HGNC:29162): (family with sequence similarity 149 member B1) Involved in cilium assembly and protein localization to cilium. Predicted to be located in cilium. Implicated in Joubert syndrome. [provided by Alliance of Genome Resources, Apr 2022]

DNAJC9 (HGNC:19123): (DnaJ heat shock protein family (Hsp40) member C9) Enables chaperone binding activity; heat shock protein binding activity; and histone binding activity. Involved in nucleosome assembly and positive regulation of ATPase activity. Located in several cellular components, including cytosol; extracellular space; and nucleoplasm. Part of chaperone complex. [provided by Alliance of Genome Resources, Apr 2022]

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
FAM149B1	NM_173348.2	c.413T>G	p.Phe138Cys	missense_variant	Exon 4 of 14	ENST00000242505.11	NP_775483.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FAM149B1	ENST00000242505.11	c.413T>G	p.Phe138Cys	missense_variant	Exon 4 of 14	5	NM_173348.2	ENSP00000242505.6
FAM149B1	ENST00000372955.7	c.233T>G	p.Phe78Cys	missense_variant	Exon 2 of 10	1		ENSP00000362046.3
DNAJC9	ENST00000469143.1	n.148-9110A>C		intron_variant	Intron 2 of 2	3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 31

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000227

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Mar 29, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.413T>G (p.F138C) alteration is located in exon 4 (coding exon 4) of the FAM149B1 gene. This alteration results from a T to G substitution at nucleotide position 413, causing the phenylalanine (F) at amino acid position 138 to be replaced by a cysteine (C). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.82
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.17
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Benign	0.25	T
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Uncertain	0.83	D
LIST_S2	Uncertain	0.88	D
M_CAP	Benign	0.071	D
MetaRNN	Uncertain	0.74	D
MetaSVM	Benign	-0.61	T
MutationAssessor	Pathogenic	2.9	M
PhyloP100		5.5
PrimateAI	Uncertain	0.60	T
PROVEAN	Uncertain	-3.6	D
REVEL	Uncertain	0.38
Sift	Uncertain	0.013	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.87
MutPred		0.37		Loss of MoRF binding (P = 0.1325);
MVP		0.51
ClinPred		1.0	D
GERP RS		5.6
Varity_R		0.43
gMVP		0.86
Mutation Taster		=55/45	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: rs1239830024; hg19: chr10-74952444;